Mitsubishi 6A1 series Manuale utente

GENERAL INFORMATION 11A-0-3

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1.SPECIFICATIONS 11A-1-1

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SERVICE SPECIFICATIONS 11A-1-1

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REWORK DIMENSIONS 11A-1-3

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TORQUE SPECIFICATION 11A-1-4

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NEW TIGHTENING METHOD - BY USE OF BOLTS TO BE

TIGHTENED IN PLASTIC AREA 11A-1-7

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SEALANTS 11A-1-7

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FORM-IN-PLACE GASKET (FIPG) 11A-1-8

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2.SPECIAL TOOLS 11A-2-1

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3.DRIVE BELT 11A-3-1

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4.TIMING BELT 11A-4-1

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5.FUEL AND EMISSION CONTROL PARTS 11A-5-1

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6.IGNITION SYSTEM 11A-6-1

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7.WATER PUMP AND WATER PIPE 11A-7-1

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8.INTAKE MANIFOLD AND EXHAUST MANIFOLD 11A-8-1

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9.ROCKER ARM AND CAMSHAFT <SOHC> 11A-9-1

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10.ROCKER COVER AND CAMSHAFT <MIVEC> 11A-10-1

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11. ROCKER ARM AND ROCKER SHAFT CAP <MIVEC> 11A-11-1

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12.CYLINDER HEAD AND VALVES 11A-12-1

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13.OIL PUMP CASE AND OIL PAN 11A-13-1

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14.PISTON AND CONNECTING ROD 11A-14-1

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15.CRANKSHAFT, CYLINDER BLOCK, FLYWHEEL

AND DRIVE PLATE 11A-15-1

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11A-0-1

PWEE9622

EFeb. 1997Mitsubishi Motors Corporation

ENGINE

6A1 SERIES

CONTENTS

11A-0-2

PWEE9622

EFeb. 1997Mitsubishi Motors Corporation

NOTES

6A1 ENGINE (E-W) - General Information 11A-0-3

GENERAL INFORMATION

GENERAL SPECIFICATIONS

Descriptions 6A12 6A13

Type 60°V, OHV, DOHC (for each bank) 60°V, OHV, SOHC (for each bank)

Number of cylinders 6 6

Combustion chamber Pentroof type Pentroof type

Total displacement dm31,998 2,498

Cylinder bore mm 78.4 81.0

Piston stroke mm 69.0 80.8

Compression ratio 10.0 9.5*1or 9.0*2

Valve timing Intake

valve

Opens

(BTDC)

15°(Low-speed cam)

37.5°(High-speed cam)

15°

Closes

(ABDC)

41°(Low-speed cam)

82.5°(High-speed cam)

53°

Exhaust

valve

Opens

(BBDC)

41°(Low-speed cam)

75°(High-speed cam)

53°

Closes

(ATDC)

15°(Low-speed cam)

30°(High-speed cam)

15°

Lubrication system Pressure feed, full-flow filtration Pressure feed, full-flow filtration

Oil pump type Trochoid type Trochoid type

Cooling system Water-cooled forced circulation Water-cooled forced circulation

Water pump type Centrifugal impeller type Centrifugal impeller type

NOTE

*1: Europe and Hong Kong

*2: GCC and Export

PWEE9622

EFeb. 1997Mitsubishi Motors Corporation

6A1 ENGINE (E-W) - Specifications 11A-1-1

1. SPECIFICATIONS

SERVICE SPECIFICATIONS

Items Standard value Limit

Timing belt

Auto tensioner rod projection mm 12.0 -

Auto tensioner rod pushed-in amount (when pushed with a force

of 98 - 196 N) mm

1.0 or less -

Rocker arm and camshaft <SOHC>

Camshaft cam height mm Intake 35.20 34.70

Exhaust 34.70 34.20

Camshaft journal diameter mm 45 -

Rocker cover and camshaft <MIVEC>

Camshaft cam height mm Intake (Low-speed cam) 34.34 33.84

(High-speed cam) 36.46 35.96

Exhaust (Low-speed cam) 34.40 33.90

(High-speed cam) 35.86 35.36

Camshaft journal diameter mm 26 -

Valve clearance mm Intake 0.10 -

Exhaust 0.13 -

Cylinder head and valve

Flatness of cylinder head gasket surface mm - -

Cylinder head gasket surface grinding limit (including grinding of

cylinder block gasket surface) mm

Less than 0.03 -

Cylinder head overall height SOHC 119.9 - 120.1 -

MIVEC 119.6 - 119.8 -

Cylinder head bolt nominal length mm - 96.4

Valve margin mm Intake 1.0 0.5

Exhaust 1.3 0.8

Valve stem diameter mm 6.0 -

Valve stem-to-guide clearance Intake 0.02 - 0.05 0.10

Exhaust 0.04 - 0.07 0.15

Valve face angle 45°- 45.5°-

Valve stem projection mm SOHC 48.45 48.95

MIVEC 48.40 48.90

PWEE9622

EFeb. 1997Mitsubishi Motors Corporation

6A1 ENGINE (E-W) - Specifications

11A-1-2

Items LimitStandard value

Overall valve length mm Intake SOHC 113.02 112.52

MIVEC 112.37 111.87

Exhaust SOHC 115.32 114.82

MIVEC 110.74 110.74

Valve spring free height mm SOHC 49.9 48.9

MIVEC 51.5 50.5

Valve spring load/installed SOHC 265/43.4 -

height N/mm

MIVEC 255/44.5 -

Valve spring squareness 2°4°

Valve seat contact width mm 0.9 - 1.3 -

Valve guide internal diameter mm 6.6 -

Valve guide projection mm SOHC 14.0 -

MIVEC 19.0 -

Oil pump case and oil pan

Oil pump tip clearance mm 0.06 - 0.18 -

Oil pump side clearance mm 0.04 - 0.10 -

Oil pump body clearance mm 0.10 - 0.18 0.35

Piston and connecting rod

Piston outside diameter mm 6A12 78.4 -

6A13 81.0 -

Piston ring side clearance mm No.1 ring 0.02 - 0.06 -

No.2 ring 0.02 - 0.06 -

Piston ring end gap mm No.1 ring 0.20 - 0.35 0.8

No.2 ring 0.35 - 0.50 0.8

Oil ring 0.20 - 0.50 1.0

Piston pin outside diameter mm 19.0 -

Piston pin press-in load (at room temperature) N 4,900 - 14,700 -

Crankshaft pin oil clearance mm 0.02 - 0.05 0.1

Connecting rod big end side clearance mm 0.10 - 0.25 0.4

Crankshaft, cylinder block, flywheel and drive plate

Crankshaft end play mm 0.05 - 0.25 0.4

PWEE9622

EFeb. 1997Mitsubishi Motors Corporation

6A1 ENGINE (E-W) - Specifications 11A-1-3

Items LimitStandard value

Crankshaft journal diameter 6A12 53.0 -

6A13 56.0 -

Crankshaft pin diameter mm 6A12 43.0 -

6A13 51.0 -

Crankshaft journal oil clearance mm 0.02 - 0.04 0.1

Cylinder block gasket surface flatness mm 0.05 -

Cylinder block gasket surface grinding limit (including grinding of

cylinder head gasket surface) mm

- 0.2

Cylinder block overall height 6A12 190.0 -

6A13 209.0 -

Cylinder block cylindricity mm 0.01 or less -

Cylinder block internal diame- 6A12 78.4 -

ter mm

6A13 81.0 -

Bearing cap bolt nominal length mm - 71.1

Piston-to-cylinder clearance mm 0.02 - 0.04 -

REWORK DIMENSIONS

Item Standard

Cylinder head and valves

Cylinder head oversize valve guide hole diameter mm 0.05 O.S. 11.05 - 11.07

0.25 O.S. 11.25 - 11.27

0.50 O.S. 11.50 - 11.52

Oversize intake valve seat SOHC 0.3 O.S. 29.80 - 29.82

ring hole diameter mm

0.6 O.S. 30.10 - 30.12

MIVEC 0.3 O.S. 32.30 - 32.32

0.6 O.S. 32.60 - 32.62

Oversize exhaust valve SOHC 0.3 O.S. 27.80 - 27.82

seat ring diameter mm

0.6 O.S. 28.10 - 28.12

MIVEC 0.3 O.S. 29.80 - 29.82

0.6 O.S. 30.10 - 30.12

PWEE9622

EFeb. 1997Mitsubishi Motors Corporation

6A1 ENGINE (E-W) - Specifications

11A-1-4

TORQUE SPECIFICATION

Items Nm

Alternator and drive belt

Alternator pivot nut 44

Alternator bolt 21

Oil level gauge guide 23

Tensioner pulley 15

Engine hanger 23

Tensioner pulley bracket A 45

Crankshaft bolt 182

Engine cover 3

Timing belt

Timing belt front cover 11

Engine support bracket 49

Angle sensor 9

Angle sensor connector bracket 11

Tensioner pulley 48

Tensioner arm 24

Auto tensioner 21

Camshaft sprocket bolt 88

Idler pulley 35

Timing belt rear cover 11

Angle sensor connector bracket 11

Fuel and emission control parts

Air intake plenum stay 18

Connector bracket 11

EGR valve 22

Throttle body 12

Air intake plenum 18

Delivery pipe 12

Fuel pipe 9

Fuel pressure regulator 9

Alternator bracket 23

PWEE9622

EFeb. 1997Mitsubishi Motors Corporation

6A1 ENGINE (E-W) - Specifications 11A-1-5

Items Nm

Ignition system

Spark plug 25

Water cover (SOHC) 11

Distributor (SOHC) 13

Ignition failure sensor (MIVEC) 10

Condenser bracket assembly (MIVEC) 5

Ignition coil (MIVEC) 10

Water pump and water pipe

Engine hanger (MIVEC) 11

Engine coolant temperature gauge unit 11

Engine coolant temperature sensor 29

Heater pipe (SOHC) 23

Water inlet fitting 18

Water outlet fitting 18

Thermostat housing 23

Water pipe 13

Water pump 23

Intake manifold and exhaust manifold

Intake manifold 17

Heat protector 13

Exhaust manifold stay 44

Exhaust manifold 49

Rocker arm and camshaft <SOHC>

Rocker cover 4

Rocker arm and rocker shaft 31

Thrust case 24

Rocker arm and camshaft <MIVEC>

Rocker cover 4

Oil control valve holder 9

Cam cap 24

Bearing cap M6 11

Bearing cap M8 24

PWEE9622

EFeb. 1997Mitsubishi Motors Corporation

6A1 ENGINE (E-W) - Specifications

11A-1-6

Items Nm

Arm spring holder 11

Rocker arm and rocker shaft cap <MIVEC>

Rocker shaft cap 11

Cylinder head and valves

Cylinder head bolt 20 + 120°+ 120°

Oil pan and oil pump

Oil pressure switch 10

Oil filter cover 21

Water hose 30

Bolt 68

Drain plug 39

Oil level sensor 9

Oil pan 7

Oil screen 19

Baffle plate 9

Relief plug 44

Oil pump case 14

Oil pump case cover 12

Piston and connecting rod

Connecting rod 18 + 90°- 100°

Crankshaft, cylinder block, flywheel and drive plate

Detonation sensor 23

Idler pulley bracket 35

Flywheel bolt 98

Drive plate bolt 98

Rear plate 11

Bell housing cover 9

Oil seal case 11

Bearing cap bolt 25 + 90°- 100°

PWEE9622

EFeb. 1997Mitsubishi Motors Corporation

6A1 ENGINE (E-W) - Specifications 11A-1-7

NEW TIGHTENING METHOD - BY USE OF BOLTS TO BE TIGHTENED IN

PLASTIC AREA

A new type of bolts, to be tightened in plastic area, is currently used in some parts of the engine. The

tightening method for the bolts is different from the conventional one. Be sure to observe the method

described in the text when tightening the bolts.

Service limits are provided for the bolts. Make sure that the service limits described in the text are strictly

observed.

DAreas where the bolts are in use:

(1) Cylinder head bolts

(2) Main bearing cap bolts

(3) Connecting rod cap bolts

DTightening Method

After tightening the bolts to the specified torque, tighten them another 90°to 100°, or 240°(twice

120°). The tightening method varies on different areas. Observe the tightening method described

in the text.

SEALANTS

Item Specified sealant Quantity

Water pump* Mitsubishi Genuine Part No. MD970389 or equivalent As required

Water outlet fitting* Mitsubishi Genuine Part No. MD970389 or equivalent As required

Engine coolant temperature sensor 3M Nut Locking Part No. 4171 or equivalent As required

Engine coolant temperature gauge unit 3M ATD Part No. 8660 or equivalent As required

Camshaft bearing 3M ATD Part No. 8660 or equivalent As required

Cam cap 3M ATD Part No. 8660 or equivalent As required

Oil control valve 3M ATD Part No. 8660 or equivalent As required

Camshaft holder* Mitsubishi Genuine Part No. MD970389 or equivalent As required

Rocker cover 3M ATD Part No. 8660 or equivalent As required

Oil pump case* Mitsubishi Genuine Part No. MD970389 or equivalent As required

Oil pan* Mitsubishi Genuine Part No. MD970389 or equivalent As required

Oil pressure switch 3M ATD Part No. 8660 or equivalent As required

Oil seal case* Mitsubishi Genuine Part No. MD970389 or equivalent As required

Drive plate bolt 3M Nut Locking Part No. 4171 or equivalent As required

Flywheel bolt 3M Nut Locking Part No. 4171 or equivalent As required

*: parts sealed by foam-in-place gasket (FIPG)

PWEE9622

EFeb. 1997Mitsubishi Motors Corporation

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