Briggs & Stratton 272147 Istruzioni operative

BRIGGS & STRATTON CORPORATION

Milwaukee, WI 53201

Part No. 275429-1/04 Printed in U.S.A.

www.briggsandstratton.com

272147 - Single Cylinder OHV Air-Cooled Engines

272144 - Vanguard™ Twin Cylinder OHV Air-Cooled Engines

275429 - Vanguard™ Twin Cylinder OHV Liquid-Cooled Engines

MS-0750 - Vanguard™ 3-Cylinder OHV Liquid-Cooled Gasoline Engines

MS-1055 - Vanguard™ 3-Cylinder OHV Liquid-Cooled Diesel Engines

Quality Starts With A

Master Service Technician

Other Briggs & Stratton

Commercial Power Repair Manuals:

Vanguard Twin Cylinder

OHV Liquid-Cooled Engines

Briggs & Stratton VANGUARD™ TWIN CYLINDER OHV LIQUID-COOLED ENGINES Part No. 275429-1/04

REPAIR MANUAL

™

275429_2LC_.1875_Spine 3/29/06 11:11 AM Page 1

For Briggs & Stratton Discount Parts Call 606-678-9623 or 606-561-4983

www.mymowerparts.com

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine

MODEL 473100

2 CYLINDER LIQUID COOLED ENGINE

COMMERCIAL POWER

MANUAL NUMBER: 275429

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine

SAFETY INFORMATION

The Briggs & Stratton engine is made of the finest

material in a state-of-the-art manufacturing facility.

Please understand that Briggs & Stratton sells engines

to original equipment manufacturers. It also sells to

others in the distribution chain who may sell to the

ultimate consumer, an equipment manufacturer, another

distributor or a dealer. As a result, Briggs & Stratton does

not necessarily know the application on which the engine

will be placed. For that reason, carefully read and

understand the operating instructions of the equipment

before you repair or operate.

You should also understand that there are equipment

applications for which Briggs & Stratton does not

approve the useof its engines. Briggs & Stratton engines

are not to be used on vehicles with less than 4 wheels.

This includes motor bikes, aircraft products and all

terrain vehicles. Moreover, Briggs & Stratton does not

approve of its engines being used in competitive events.

FOR THAT REASON, BRIGGS & STRATTON

ENGINES ARE NOT AUTHORIZED FOR ANY OF

THESE APPLICATIONS. Failure to follow this warning

could result in death, serious injury (including paralysis)

or property damage.

IN THE INTEREST OF SAFETY

The safety alert symbol ( ) is used to identify safety

information about hazards that can result in personal

injury.

A signal word (DANGER, WARNING, or CAUTION) is used

with the alert symbol to indicate the likelihood and the

potential severity of injury. In addition, a hazard symbol

may be used to represent the type of hazard.

DANGER indicates a hazard which, if not

avoided, will result in death or serious injury.

WARNING indicates a hazard which, if not

avoided, could result in death or serious injury.

CAUTION indicates a hazard which, if not

avoided, might result in minor or moderate injury.

CAUTION: When this signal word is used without the

alert symbol, it indicates a situation that could result in

damage to the engine.

• Prior to work, read and understand the section(s) of

this manual that pertain to the job. Follow all safety

warnings.

• Wear suitable eye protection.

• Prevent accedental starting by removing spark plug

wire from spark plug when servicing engine or

equipment. Disconnect negative battery terminal if

equipped with electric starting system.

• Periodically clean engine. Keep governor parts free

of dirt, grass and other debris which can affect

engine speed.

• Always use fresh gasoline. Stale fuel can gum

carburetor and cause leakage.

• Check fuel lines and fittings frequently for cracks or

leaks and replace if necessary.

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine

Table Of Contents

Page 1

MODEL 473100

2 CYLINDER LIQUID COOLED ENGINE

COMMERCIAL POWER .........................................1

SAFETY INFORMATION .......................................2

IN THE INTEREST OF SAFETY...................... 2

SECTION 1

GENERAL INFORMATION .................................... 3

ENGINE IDENTIFICATION ..............................4

MAINTENANCE SCHEDULE ...........................5

FUEL AND OIL RECOMENDATIONS ..............6

CHANGING OIL AND OIL FILTER................... 7

CHANGE COOLANT ........................................7

CLEANING DEBRIS .........................................8

ADJUST FAN BELT .........................................8

AIR CLEANER MAINTENANCE ......................8

REPLACE SPARK PLUG .................................9

SECTION 2

TROUBLESHOOTING .........................................11

GENERAL INFORMATION ............................11

WILL NOT START ..........................................11

STARTER CURRENT DRAW TEST ..............12

NO LOAD

STARTER CURRENT DRAW TEST ..............13

CHECK CARBURETION ................................16

FUEL SHUT-OFF SOLENOID ........................16

FUEL PUMP - GENERAL INFORMATION ....17

CYLINDER BALANCE TEST .........................18

CYLINDER LEAKDOWN TEST ......................19

CHECKING COOLING SYSTEM ...................21

CHECK OIL PRESSURE SWITCH ................22

CHECK OIL PRESSURE ...............................23

CHARGING SYSTEM .....................................23

BATTERY INFORMATION .............................25

EQUIPMENT

AFFECTING ENGINE OPERATION ...............26

SECTION 3

ENGINE DISASSEMBLY ......................................27

GENERAL INFORMATION .............................27

REMOVE MUFFLER .......................................27

REMOVE RADIATOR .....................................27

DISCONNECT FUEL LINES ...........................28

REMOVE FAN ASSEMBLY ............................28

REMOVE CARBURETOR ..............................29

REMOVE STARTER .......................................30

REMOVE INTAKE MANIFOLD .......................31

REMOVE ALTERNATOR ...............................32

REMOVE CYLINDER HEADS ........................32

REMOVE CRANKCASE COVER ...................33

REMOVE CAMSHAFT ....................................34

REMOVE PISTONS, RODS, CRANKSHAFT .34

SECTION 4

ENGINE OVERHAUL ............................................35

CHECK CYLINDER ........................................35

BEARINGS ......................................................37

CRANKSHAFT ................................................38

PISTON, RINGS AND CONNECTING ROD

DISASSEMBLY AND INSPECTION ...............38

CYLINDER HEAD

INSPECTION AND REPAIR ...........................41

OIL PUMP .......................................................44

REPLACING WATER PUMP SEAL ................45

REPLACING STARTER SOLENOID ..............46

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine

Table Of Contents

Page 2

REPLACING PINION GEAR ASSEMBLY ......47

CARBURETOR INSPECTION AND REPAIR .51

SECTION 5

ENGINE ASSEMBLY ............................................57

INSTALL CRANKSHAFT ................................57

ASSEMBLE

PISTON AND CONNECTING ROD ................57

ASSEMBLE PISTON RINGS TO PISTON .....57

INSTALL

PISTON AND CONNECTING ROD ................58

INSTALL CAMSHAFT ....................................59

INSTALL GOVERNOR GEAR ........................59

INSTALL CRANKCASE COVER ....................59

INSTALL STARTER .......................................60

INSTALL ALTERNATOR ................................60

INSTALL FLYWHEEL .....................................61

INSTALL CYLINDER HEADS .........................61

INSTALL ROCKER ARMS .............................61

ADJUST VALVE CLEARANCE ......................62

INSTALL ARMATURES ..................................62

INSTALL FAN ASSEMBLY .............................63

INSTALL INTAKE MANIFOLD ........................64

INSTALL CARBURETOR AND INTAKE ELBOW

ASSEMBLY ....................................................64

ADJUST GOVERNOR ....................................66

INSTALL MUFFLER .......................................66

INSTALL RADIATOR ......................................67

INSTALL AIR CLEANER ASSEMBLY ............67

SECTION 6

FINAL ADJUSTMENTS AND

SPECIFICATIONS ................................................ 71

GENERAL INFORMATION ............................ 71

REMOTE GOVERNOR CONTROLS.............. 71

CARBURETOR ADJUSTMENT ..................... 72

MODEL 473100 SPECIFICATIONS ............... 75

ENGINE HARNESS ....................................... 77

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine

Section 1 - General Information

Page 3

SECTION 1 GENERAL INFORMATION

BRIGGS & STRATTON NUMERICAL IDENTIFICATION SYSTEM

This chart explains the unique Briggs & Stratton numerical model designation system. It is possible to determine most of the important

mechanical features of the engine by merely knowing the model number. Here is how it works:

• A. The first one or two digits indicate the approximate CUBIC INCH DISPLACEMENT.

• B. The first digit after the displacement indicates the BASIC DESIGN SERIES, relating to cylinder construction, ignition, general

configuration, etc.

• C. The second digit after the displacement indicates ORIENTATION OF CRANKSHAFT.

• D. The third digit after the displacement indicates TYPE OF BEARINGS, and whether or not the engine is equipped with

REDUCTION GEAR or AUXILIARY DRIVE.

• E. The last digit indicates the TYPE OF STARTER.

BRIGGS & STRATTON MODEL NUMBERING SYSTEM

First Digit

After Displalcement Second Digit

After Displalcement Third Digit

After Displalcement Fourth Digit

After Displalcement

ABCDE

Cubic Inch

Displacement Basic

Design Series PTO Bearing

Reduction Gear,

Auxiliary Drive,

Lubrication

Crankshaft

Orientation Type of

Starter

Plain Bearing/DU

Non-Flange Mount

Plain Bearing

Flange Mount

Sleeve Bearing

Flange Mounting

Splash Lube

Ball Bearing

Flange Mounting

Splash Lube

Ball Bearing

Flange Mounting

Pressure Lubrication

Plain Bearing

Gear Reduction

(6-1) CCW Rotation

Flange Mounting

Plain Bearing

Gear Reduction

(2-1) CCW Rotation

Plain Bearing

Pressure Lubrication

Plain Bearing

AuxiliaryDrive(PTO)

Perpendicular to

Crankshaft

Plain Bearing

AuxiliaryDrive(PTO)

Parallel to

Crankshaft

Plain Bearing

Pressure Lubrication

Without Oil Filter

0 -

1 -

2 -

3 -

4 -

5 -

6 -

7 -

8 -

9 -

A -

Example - To Identify Model 303447:

30 Cubic Inch 3

Design Series 3 4

Horizantal Shaft

A to Z

0 to 4 - Horizantal Shaft

5 to 9 - Verticle Shaft

A to G - Horizantal Shaft

H to z - Verticle Shaft

Without Starter

Rope Starter

Rewind Starter

Electric Starter Only

110 or 230 Volt Gear

Drive

Electric Starter/110

or 230 Volt Gear

Drive with Alternator

Electric Starter Only

12 or 24 Volt Gear

Drive

Alternator Only

Electric Starter 12 or

24 Volt Gear Drive

with Alternator

Verticle Pull Starter

or Side Pull Starter

Mechanical Starter

Electric Starter 12 or

24 Volt Gear Drive

with Alternator and

Inverter

0 -

1 -

2 -

3 -

4 -

5 -

6 -

7 -

8 -

9 -

A -

Horizantal Shaft

Flange Mounting

Pressure Lubrication

Electric Starter

12 or 24 Volt Gear Drive

with Alternator

TYPE 1234-01 The type number identifies the engine mechanical parts, color of paint, decals, goverened speed and original Equipment Manufacturer.

Code 01061201 The code is the manufacturing dat and is read as follows:

Year

01 MONTH

06 DAY

12 ASSEMBLY LINE AND MANUFACTURING PLANT

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine

Section 1 - General Information

Page 4

ENGINE IDENTIFICATION

Fig. 1

Oil Fill Cap

Dipstick

Spark Plug

12V Electric Starter

Oil Drain Plug

Fan Belt (If Equipped)

Fuel Filter

Radiator Drain Plug (If Equipped)

Radiator Screen & Handle (If Equipped)

Radiator & Radiator Cap (If Equipped)

Air Cleaner (If Equipped)

Fuel Pump

Muffler (If Equipped)

Choke Control

Throttle Control (2 Possible Locations)

Radiator Reservoir (If Equipped)

Oil Filter

Oil Drip Tray (Igf Equipped)

Oil Pressure Switch

Engine Model Label

MODEL TYPE CODE

xxxxxx xxxx xx xxxxxxxx

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine

Section 1 - General Information

Page 5

Change oil after first 50 hours of use, then every

100 hours or every season. Change oil every 50

hours when operating the engine under heavy load orin

high temperatures.

Clean more often under dusty conditions or when

airborne debris is present. Replace air cleaner

parts, if very dirty.

If an extended life coolant is used, interval may be

increased to once every 3000 hours.

MAINTENANCE SCHEDULE

Daily 50 Hours 100 Hours 250 Hours 600 Hours Yearly

Check Oil

Level X

Check For Oil

Leaks X

Change Oil X*

Change Oil

Filter X*

Check

Coolant

Change

Coolant XX***

Check Fan

Belt X

Clean Air

Filter X**

Replace Air

Filter X**

Check Valve

Clearance X

Check

Battery

Electrolyte

Change

Spark Plugs X

Change Fuel

Filter X

Clean Spark

arrestor X

***

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