TM 9-1829A Guida

TM 9-1829A, April 1944 1/100 2021-07-07

TM 9-1829A

War department

Ordnance Maintenance

Speedometers, Tachometers and

Recorders

 
TM 9-1829A, April 1944 2/100 2021-07-07 
Contents 
Chapter 1: Introduction...........................................................................................................................................7 
Purpose and scope.....................................................................................................................................7 
Chapter 2: Magnetic-type speedometers and tachometers; description, operation identification and testing.........7 
Description and operation .........................................................................................................................7 
Identification...........................................................................................................................................11 
Bench test procedure...............................................................................................................................12 
Chapter 3: AC division of general motors speedometers and tachometers...........................................................15 
Description..............................................................................................................................................15 
Disassembly............................................................................................................................................17 
Cleaning, inspection, and repair of parts.................................................................................................18 
Assembly.................................................................................................................................................19 
Calibration...............................................................................................................................................21 
Chapter 4: Auto-Lite speedometers and tachometers...........................................................................................23 
Section I: SPA series........................................................................................................................................23 
Description............................................................................................................................................23 
Disassembly ..........................................................................................................................................23 
Cleaning, inspection, and repair of parts...............................................................................................25 
Assembly...............................................................................................................................................26 
Calibration.............................................................................................................................................29 
Section II: SPJ, SPL and SPM series ...............................................................................................................31 
Description............................................................................................................................................31 
Disassembly ..........................................................................................................................................31 
Cleaning, inspection, and repair of parts...............................................................................................32 
Assembly...............................................................................................................................................32 
Section III: SPK, SPP and SPR Series.............................................................................................................34 
Description............................................................................................................................................34 
Disassembly ..........................................................................................................................................35 
Cleaning, inspection, and repair of parts...............................................................................................37 
Assembly...............................................................................................................................................37 
Chapter 5: King-Seeley speedometer ...................................................................................................................38 
Disassembly ..........................................................................................................................................38 
Cleaning, inspection, and repair of parts...............................................................................................40 
Assembly...............................................................................................................................................40 
Calibration.............................................................................................................................................42 
Chapter 6: Stewart warner speedometers and tachometers...................................................................................43 
Section I: Speedometers with cup-type magnets..............................................................................................43 
Description............................................................................................................................................43 
Disassembly ..........................................................................................................................................43 
Cleaning, inspection, and repair of parts...............................................................................................48 
Assembly and calibration......................................................................................................................49 
Section II: Speedometers and tachymeters with flat disk-type magnets..........................................................56 
Description............................................................................................................................................56 
Disassembly ..........................................................................................................................................57 
Cleaning, inspection and repair of parts................................................................................................62 
Assembly and calibration......................................................................................................................62 
Section III: Centrifugal tachometers................................................................................................................70 
Description and operation .....................................................................................................................70 
Bench test procedure.............................................................................................................................71 
Disassembly ..........................................................................................................................................72 
Cleaning, inspection, and repair of parts...............................................................................................73 
Assembly and calibration......................................................................................................................74 
Chapter 7: Waltham speedometers .......................................................................................................................76 
Description............................................................................................................................................76 
Disassembly ..........................................................................................................................................76 
Cleaning, inspection, and repair of parts...............................................................................................77 
Assembly and calibration......................................................................................................................78 
Chapter 8: Stewart-Warner recorders ...................................................................................................................80 

 
TM 9-1829A, April 1944 3/100 2021-07-07 
45. Description............................................................................................................................................80 
46. Operation...............................................................................................................................................81 
47. Disassembly ..........................................................................................................................................81 
48. Cleaning, inspection, and repair of parts...............................................................................................82 
49. Assembly...............................................................................................................................................82 
50. Description............................................................................................................................................83 
51. Operation...............................................................................................................................................83 
52. Repair of flexible shafts ........................................................................................................................83 
Chapter 10: AC speed adapters.............................................................................................................................88 
53. Function ................................................................................................................................................88 
54. Application............................................................................................................................................88 
55. Disassembly, repair, and assembly .......................................................................................................88 
Chapter 11: Stewart-Warner drive joints..............................................................................................................89 
Section I: 666-type drive joints........................................................................................................................89 
56. Description............................................................................................................................................89 
57. Operation...............................................................................................................................................90 
58. Disassembly ..........................................................................................................................................90 
59. Cleaning and inspection........................................................................................................................91 
60. Assembly...............................................................................................................................................92 
Section II: 659-type drive joints.......................................................................................................................94 
61. Description............................................................................................................................................94 
62. Operation...............................................................................................................................................94 
63. Repair....................................................................................................................................................94 
Chapter 12: Special tools......................................................................................................................................95 
64. Special tools..........................................................................................................................................95 
Chapter 13: Calibrating machine..........................................................................................................................98 
65. Description............................................................................................................................................98 
66. Operation...............................................................................................................................................98 
67. Lubrication............................................................................................................................................99 
References ..........................................................................................................................................................100 
Standard nomenclature list.............................................................................................................................100 
Explanatory publications ...............................................................................................................................100 
General......................................................................................................................................................100 
Related technical manuals.........................................................................................................................100 
Decontamination.......................................................................................................................................100 
 
 

 
TM 9-1829A, April 1944 4/100 2021-07-07 
Figures 
Figure 1: Speedometer............................................................................................................................................7 
Figure 2: Speedometer installation .........................................................................................................................8 
Figure 3: Flexible shaft...........................................................................................................................................8 
Figure 4: Tachometer..............................................................................................................................................8 
Figure 5: Phantom view of basic components of speed-indicating portion of speedometer...................................9 
Figure 6: Phantom view of speedometer ..............................................................................................................10 
Figure 7: Schematic view of total odometer.........................................................................................................10 
Figure 8: Schematic view of a trip odometer........................................................................................................11 
Figure 9: Rear of AC speedometer .......................................................................................................................11 
Figure 10: Rear of Auto-Lite Speedometer ..........................................................................................................11 
Figure 11: Front and rear of King-Seeley speedometer........................................................................................12 
Figure 12: Rear of Stewart-Warner Speedometer.................................................................................................12 
Figure 13: Waltham speedometer.........................................................................................................................12 
Figure 14: Testing for tight mechanism................................................................................................................13 
Figure 15: AC speedometer disassembled............................................................................................................15 
Figure 16: AC tachometer disassembled ..............................................................................................................16 
Figure 17: Speedometer mechanism (dial removed) ............................................................................................16 
Figure 18: Quick reset trip odometer removed from frame..................................................................................17 
Figure 19: Removing second gear from frame .....................................................................................................18 
Figure 20: Removing magnet shaft collar, using dismantling wrench (T-170654) ..............................................18 
Figure 21: Pressing collar on magnet shaft, using fixture (T-170666 with Det. 1)...............................................19 
Figure 22: Flaring magnet shaft, using fixture (T-170666 with Det. 6) ...............................................................20 
Figure 23: Charging AC speedometer or tachometer magnet, using magnetizer (846294)..................................21 
Figure 24: Auto-Lite speedometer (SPA-type), disassembled..............................................................................23 
Figure 25: SPA-type speedometer mechanism (dial removed).............................................................................23 
Figure 26: Removing hair spring, using puller (T-66296)....................................................................................24 
Figure 27: Making clearance for hair spring puller with lifter (T-29 Det. 3) .......................................................24 
Figure 28: Removing second gear........................................................................................................................25 
Figure 29: Removing magnet shaft collar, using dismantling wrench (T-170654) ..............................................25 
Figure 30: Stacking intermediate gear, using fixture (T-178717).........................................................................26 
Figure 31: Pressing collar on magnet shaft, using fixture (T-170666 with Det. 1)...............................................27 
Figure 32: Flaring magnet shaft, using fixture (T-170666 with Det. 6) ...............................................................27 
Figure 33: Adjusting front jewel, using special tool (T-178705)..........................................................................27 
Figure 34: Checking speed cup staff end play, using feeler gage (ST-263-27)....................................................28 
Figure 35: Charging magnet, using Magnetizer (846294)....................................................................................29 
Figure 36: Auto-Lite speedometer (SPJ, SPL and SPM-type), disassembled ......................................................31 
Figure 37: Auto-Lite speedometer (SPK- and SPR-types), disassembled............................................................34 
Figure 38: Auto-Lite tachometer (SPP-type), disassembled.................................................................................34 
Figure 39: SPK-type speedometer mechanism (dial removed).............................................................................35 
Figure 40: Removing field plate and speed cup....................................................................................................35 
Figure 41: Removing second gear, using extractor (ST-263-34)..........................................................................36 
Figure 42: Removing magnet shaft collar, using dismantling wrench (T-170654) ..............................................36 
Figure 43: Staking second gear bushing, using installer (ST-263-35)..................................................................37 
Figure 44: King-Seeley speedometer, disassembled.............................................................................................38 
Figure 45: Speedometer mechanism (dial removed) ............................................................................................39 
Figure 46: Removing hair spring, using Puller (T-66296)....................................................................................39 
Figure 47: Removing magnet shaft collar, using dismantling wrench (T-170654) ..............................................40 
Figure 48: Flaring magnet shaft, using fixture (T-170666 with Det. 6) ...............................................................41 
Figure 49: Applying thumb pressure on magnet shaft while adjusting front jewel with special tool (T-178705)41 
Figure 50: Stewart-Warner speedometer with cup-type magnet disassembled ....................................................43 
Figure 51: Tearing out section of rolled bezel......................................................................................................44 
Figure 52: Pullig off rolled bezel..........................................................................................................................44 
Figure 53: Removing disk-type pointer, using special puller (T-131105)............................................................44 
Figure 54: Speedometer mechanism (dial removed) ............................................................................................44 
Figure 55: Speedometer mechanism with odometers in line ................................................................................45 
Figure 56: Speedometer mechanism (odometers removed)..................................................................................45 

 
TM 9-1829A, April 1944 5/100 2021-07-07 
Figure 57: Removing hair spring pin....................................................................................................................45 
Figure 58: Removing hair spring, using puller (T-66296)....................................................................................46 
Figure 59: Front jewel assembly...........................................................................................................................46 
Figure 60: Removing magnet shaft collar, using dismantling wrench (T-170654) ..............................................46 
Figure 61: Smoothing out flare in magnet shaft, using fixture (T-170666 with Det. 7).......................................47 
Figure 62: Removing burs from magnet shaft......................................................................................................47 
Figure 63: Staking intermediate gear, using fixture (T-178717) ..........................................................................48 
Figure 64: Removing oil wick plug......................................................................................................................48 
Figure 65: Pressing collar on magnet shaft, using fixture (T-170666 with Det. 1)...............................................49 
Figure 66: Flaring magnet shaft, using fixture (T-170666 with Det. 6) ...............................................................49 
Figure 67: Replacing oil wick plug.......................................................................................................................50 
Figure 68: Adjusting front jewel, using special tool (T-178705)..........................................................................50 
Figure 69: Magnet strength tester (408165, on frame and magnet assembly) attached to calibrating machine (T-
170645).................................................................................................................................................................51 
Figure 70: Replacing hair spring, using assembly kit (T-29) ...............................................................................52 
Figure 71: Adjusting hair spring tension by turning collet on staff, using adjuster (T-51742).............................53 
Figure 72: Aligning total odmeter figure wheels with dial window, using spanner wrench (T-40783) ...............53 
Figure 73: Holding speedometer on calibrating machine (T-170645) and testing at 30 mph...............................54 
Figure 74: Placing upper die of Bezel rolling fixture (T-178730) over speedometer...........................................55 
Figure 75: Rolling bezel with fixture (T-178730) in arbor press..........................................................................55 
Figure 76: Stewart-Warner speedometer with flat disk-type magnet disassembled .............................................56 
Figure 77: Driving off pressed-on bezel, using remover (T-42358).....................................................................57 
Figure 78: Removing pointer................................................................................................................................57 
Figure 79: Removing elbow joint screw...............................................................................................................58 
Figure 80: Removing bevel gear and sleeve assembly, using spanner wrench (T-49509) ...................................58 
Figure 81: Speedometer mechanism (dial removed) ............................................................................................58 
Figure 82: Drilling out crimping at center of spur gear........................................................................................59 
Figure 83: Speedometer mechanism (odometer frame removed).........................................................................59 
Figure 84: Removing hair spring, using puller (T-66296)....................................................................................60 
Figure 85: Removing second gear........................................................................................................................60 
Figure 86: Removing magnet shaft collar, using dismantling wrench (T-170654) ..............................................61 
Figure 87: Smoothing out flare in magnet shaft, using fixture (T-170666 with Det. 7).......................................61 
Figure 88: Driving out magnet retained by bevel gear .........................................................................................62 
Figure 89: Magnet removed from frame...............................................................................................................62 
Figure 90: Pressing collar on magnet shaft, using fixture (T-170666 with Det. 1)...............................................63 
Figure 91: Pressing bevel gear on magnet shaft, using fixture (T-170666 with Det. 1).......................................63 
Figure 92: Flaring magnet shaft, using fixture (T-170666 with Det. 6) ...............................................................63 
Figure 93: Driving second gear bushing in place .................................................................................................64 
Figure 94: Magnet strengt tester (408164; on frame and magnet assembly) attached to calibrating machine (T-
170645).................................................................................................................................................................64 
Figure 95: Replacing hair spring, using assembly kit (T-29) ...............................................................................65 
Figure 96: Adjusting front jewel, using special tool (T-178705)..........................................................................66 
Figure 97: Replacing hair spring pin ....................................................................................................................66 
Figure 98: Staking intermediate gear, using fixture (T-178717) ..........................................................................67 
Figure 99: Odometer frame with total odometer in place.....................................................................................67 
Figure 100: Trip odometer and attaching parts.....................................................................................................67 
Figure 101: Mechanism with speed unit and odometer frame removed to show position of second and third gears
..............................................................................................................................................................................68 
Figure 102: Moving magnet regulator, using adjusting kit (T-178715) ...............................................................68 
Figure 103: Stewart-Warner centrifugal tachometer...........................................................................................70 
Figure 104: Stewart-Warner centrifugal tachometer, disassembled....................................................................70 
Figure 105: Centrifugal tachometer mechanism installed ....................................................................................71 
Figure 106: Removing pointer, using lifter (T-29 Det. 3) ....................................................................................72 
Figure 107: Tachometer mechanism (dial removed) and rear view of dial ..........................................................72 
Figure 108: Loosening upper ball race lock nut ...................................................................................................72 
Figure 109: Unscrewing upper ball race...............................................................................................................73 
Figure 110: Removing governor shaft..................................................................................................................74 
Figure 111: Adjusting clearance between upper spider and upper ball race.........................................................74 

 
TM 9-1829A, April 1944 6/100 2021-07-07 
Figure 112:Tapping pointer on staff while running on calibrating machine (T-170645) .....................................75 
Figure 113: Waltham speedometer, disassembled................................................................................................76 
Figure 114: Speedometer mechanism (dial removed) ..........................................................................................77 
Figure 115: Speedometer mechanism (odometers removed)................................................................................77 
Figure 116: Frame, second gear and magnet assembly ........................................................................................78 
Figure 117: Loosening bonnet adjusting screws with calibration adjuster (STS-10878) .....................................79 
Figure 118: Stewart-Warner hour meter and mileage recorder ............................................................................80 
Figure 119: Stewart-Warner recorder, disassembled............................................................................................80 
Figure 120: Recorder with cover removed ...........................................................................................................81 
Figure 121: Removing sleeve retaining pin..........................................................................................................81 
Figure 122: Driving out sleeves............................................................................................................................82 
Figure 123: Pressing sleeves into case..................................................................................................................82 
Figure 124: Flexible shaft.....................................................................................................................................83 
Figure 125: Drawing showing length to cut core stock ........................................................................................83 
Figure 126: Cutting core stock, using fixture (T-136374)....................................................................................84 
Figure 127: Squaring end of inner core, using fixture (T-136374).......................................................................85 
Figure 128: Crimping tip on inner core, using fixture (T-136374).......................................................................85 
Figure 129: Drawing showing length to cut casing stock.....................................................................................86 
Figure 130: Crimping ferrule, using fixture (T-52644) ........................................................................................86 
Figure 131: Ferrule crimped on casing.................................................................................................................86 
Figure 132: Crimping ferrule, using pliers (T-122308)........................................................................................87 
Figure 133: Lubricating inner core as it is assembled to casing ...........................................................................87 
Figure 134: AC heavy-duty speed adapter ...........................................................................................................88 
Figure 135: AC heavy-duty speed adapter, disassembled ....................................................................................88 
Figure 136: Stewart-warner type 666 drive joint..................................................................................................89 
Figure 137: Stewart-Warner type 666 drive joint, disassembled..........................................................................89 
Figure 138: Removing gear (A), using adapter tool (T-178708 Det. 4) ...............................................................90 
Figure 139: Driving out sleeve retaining pin........................................................................................................90 
Figure 140: Driving out sleeve .............................................................................................................................90 
Figure 141: Removing gear (D), using adapter tool (T-178708 Det. 3) ...............................................................91 
Figure 142: Pressing gears off shaft, using adapter tool (T-178708 Det. 1).........................................................91 
Figure 143: Pressing gear (C), on shaft, using adapter tool (T-178708 Det. 1)....................................................92 
Figure 144: Dimensional drawing of intermediate gears assembled on shaft.......................................................92 
Figure 145: Pressing sleeve into case ...................................................................................................................92 
Figure 146: Pressing gear (D), on shaft, using adapter tool (T-178708 Det. 1 and 5)..........................................93 
Figure 147: Pressing sleeve (transmission end) into case, using adapter tool (T-178708 Det. 3) ........................93 
Figure 148: Pressing gear (A) on shaft, using adapter tool (T-178708 Det. 1 and 3)...........................................93 
Figure 149: Stewart-Warner 659 Distributor-type drive joint ..............................................................................94 
Figure 150: Stewart-Warner 659-type drive joint, partially disassembled ...........................................................94 
Figure 151: Master tool kit (T-187852)................................................................................................................95 
Figure 152: Calibrating machine and Accessories (T-170645); magnet strengt testers and hair spring kit (408082)
..............................................................................................................................................................................96 
Figure 153: Special tools......................................................................................................................................97 
Figure 154: Special tools......................................................................................................................................97 
Figure 155: Calibrating machine (T-170645) with speedometer mounted on spindle no. 1 ready for test...........98 
Figure 156: Demagnetizing, using special tool (846294) while operating speedometer on calibrating machine (T-
170645).................................................................................................................................................................99 
 
 
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TM 9-1829A, April 1944 7/100 2021-07-07

Chapter 1: Introduction

1. Purpose and scope

a. The instructions contained in this manual are for the information and guidance of personnel charged with the

repair and rebuilding of speedometers, tachometers, recorders, and related drive equipment. These

instructions are supplementary to those in the field manuals and technical manuals prepared for the using

arms. This manual does not contain information which is intended primarily for the using arms, since such

information is available to ordnance maintenance personnel in 100-series TM’s or FM’s.

b. This manual contains a description of, and procedure for testing, disassembly, cleaning, inspection, and

assembly of all makes of speedometers, tachometers, recorders (including hourmeters), flexible shafts, and

drive joints.

c. For instructions for removal and replacement of instruments, etc., on vehicles, refer to pertinent operator’s

manual 100-series TM’s.

Chapter 2: Magnetic-type speedometers and tachometers; description, operation

identification and testing

2. Description and operation

a. Description: All makes of magnetic-type speedometers and tachometers are similar in outward appearance,

having a case, bezel, glass, pointer, and face dial (where the bezel and glass are assembled in the instrument

panel, these parts are not attached to the speedometer itself).

(1) Speedometer: A speedometer (fig. 1) is used to indicate vehicle speed in miles per hour as shown by the

pointer and face dial, and to record distance traveled by means of an odometer. A speedometer is driven

through a flexible shaft connected to a set of gears in the vehicle transmission (fig. 2). These gears are

designed for the particular vehicle model and take into consideration the tire size and rear axle ratio. The

flexible shaft, which connects the transmission driven gear to the speedometer, consists of an outer casing

and the inner drive core (fig. 3). The total odometer usually records up to 99’999 miles before it

automatically returns to zero. The trip odometer usually registers up to 999.9 miles, but by means of the

trip reset it can be reset to zero or any intermediate figure desired. Some speedometers are not equipped

with a trip odometer. These units have an extra wheel or tenth dial at the right of the total odometer.

Figure 1: Speedometer

(2) Tachometer: A magnetic-type tachometer (fig. 4) is similar to a speedometer, except that the face dial

indicates in revolutions per minute (instead of miles per hour) and is ordinarily used to indicate vehicle

engine speed. A tachometer is driven through a flexible shaft which is usually connected to the vehicle

generator shaft, crankshaft, or distributor shaft by means of a drive joint or adapter. An odometer is often

incorporated in a tachometer to record total revolutions.

TM 9-1829A, April 1944 8/100 2021-07-07

Figure 2: Speedometer installation

Figure 3: Flexible shaft

Figure 4: Tachometer

TM 9-1829A, April 1944 9/100 2021-07-07

b. Operation: Even though the internal parts of the various make magnetic-type instruments vary in

construction and appearance, they all incorporate the same basic components (as described below) and

operate on the same principles.

(1) Speed indication (fig. 5): The speed-indicating portion of a speedometer or tachometer of the magnetic-

type operates on the magnetic principle and includes a revolving permanent magnet (driven by the

flexible shaft). Around this revolving permanent magnet is a stationary field plate (some Auto-Lite

instruments have a revolving field plate). Between the magnet and field plate is a movable speed cup,

with the indicating pointer attached to the end of the speed cup staff. The magnet revolves within the

speed cup. The revolving magnet sets up a rotating magnetic field which exerts a pull or magnetic drag

on the speed cup, making it revolve in the same direction. The movement of the speed cup is retarded

and held steady by a hair spring attached to the speed cup staff. The speed cup comes to rest at a point

where the magnetic drag is just balanced by the retarding force created by the hair spring. An additional

function of the hair spring is to pull the pointer back to zero when the vehicle or engine stops. There is

no mechanical connection between the revolving magnet and the speed cup. As the speed of the magnet

increases due to vehicle acceleration or (as in the case of a tachometer) increase in the engine speed, the

magnetic drag on the speed cup also increases and pulls the speed cup further around, thus registering a

faster speed by the pointer and face dial. The magnetic field is constant, and the amount of speed cup

deflection is at all times proportionate to the speed at which the magnet is being revolved.

Figure 5: Phantom view of basic components of speed-indicating portion of speedometer

TM 9-1829A, April 1944 10/100 2021-07-07

Figure 6: Phantom view of speedometer

(2) Odometer operation.

a) Total odometer (fig. 7): The total odometer is driven through a series of gears originating at a spiral

gear cut on the magnet shaft. This gear, known as the “first gear,” drives an intermediate “second

gear” and “third gear” which is connected to a “fourth gear” at the odometer. The “fourth gear” turns

the odometer through a series of “star pinion” gears inside the odometer dials or figure wheels. The

total odometer usually has five figure wheels or dials and is so constructed and geared that as any

one wheel finishes a complete revolution it turns the next figure wheel to the left 1/10 of a revolution.

Figure 7: Schematic view of total odometer

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