Mitsubishi 4G1 series Manuale di istruzioni

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 SPECIFICATIONS 11A-1-4

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NEW TIGHTENING METHOD-BY USE OF BOLTS TO BE

TIGHTENED IN PLASTIC AREA 11A-1-6

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SEALANT 11A-1-6

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FORM-IN-PLACE GASKET 11A-1-7

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2. SPECIAL TOOLS 11A-2-1

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3. ALTERNATOR AND IGNITION SYSTEM 11A-3-1

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4. TIMING BELT 11A-4-1

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

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6. WATER PUMP AND WATER HOSE 11A-6-1

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7. INTAKE AND EXHAUST MANIFOLD 11A-7-1

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8. ROCKER ARMS AND CAMSHAFT 11A-8-1

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9. CYLINDER HEAD AND VALVES 11A-9-1

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10. OIL PUMP AND OIL PAN 11A-10-1

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

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12. CRANKSHAFT, CYLINDER BLOCK 11A-12-1

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11A-0-1

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

ENGINE

4G1 SERIES

CONTENTS

11A-0-2

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

NOTES

4G1 ENGINE (E-W) - General Information 11A-0-3

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

GENERAL INFORMATION

4G1 ENGINE (E-W) - General Information

11A-0-4

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

4G1 ENGINE (E-W) - General Information 11A-0-5

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ENov. 1995Mitsubishi Motors Corporation

Descriptions 4G13 12-VALVE - CARBURETOR 4G13 12-VALVE-MPI

Type In-line OHV, SOHC In-line OHV, SOHC

Number of cylinders 4 4

Combustion chamber Pentroof type Pentroof type

Total displacement dm31,299 1,299

Cylinder bore mm 71.0 71.0

Piston stroke mm 82.0 82.0

Compression ratio 9.5 9.5

Number of Intake 8 8

valves

Exhaust 4 4

Valve timing Intake opens BTDC 14_BTDC 19_

Intake closes ABDC 48_ABDC 43_

Exhaust opens BBDC 55_BBDC 60_

Exhaust closes ATDC 13_ATDC 8_

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

PWEE9520-A

EDec. 1998Mitsubishi Motors Corporation Revised

4G1 ENGINE (E-W) - General Information

11A-0-6

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

Descriptions 4G13 16-VALVE-MPI 4G18 16-VALVE-MPI

Type In-line OHV, SOHC In-line OHV, SOHC

Number of cylinders 4 4

Combustion chamber Pentroof type Pentroof type

Total displacement dm31,299 1,584

Cylinder bore mm 71.0 76.0

Piston stroke mm 82.0 87.3

Compression ratio 10 9.5

Number of Intake 8 8

valves

Exhaust 8 8

Valve timing Intake opens BTDC 17_BTDC 17_

Intake closes ABDC 39_ABDC 39_

Exhaust opens BBDC 49_BBDC 49_

Exhaust closes ATDC 7_ATDC 7_

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

PWEE9520-A

EDec. 1998Mitsubishi Motors Corporation Revised

4G1 ENGINE (E-W) - General Information 11A-0-7

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

Descriptions 4G15-CARBURETTOR 4G15-MPI

Type In-line OHV, SOHC In-line OHV, DOHC

Number of cylinders 4 4

Combustion chamber Semi spherical type Pentroof type

Total displacement dm31,468 1,468

Cylinder bore mm 75.5 75.5

Piston stroke mm 82.0 82.0

Compression ratio 9.0 9.5

Number of Intake 8 8

valve

Exhaust 4 8

Valve timing Intake opens BTDC 14_BTDC 16_

Intake closes ABDC 48_ABDC 40_

Exhaust opens BBDC 55_BBDC 45_

Exhaust closes ATDC 13_ATDC 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

PWEE9520-A

EDec. 1998Mitsubishi Motors Corporation Added

NOTES

4G1 ENGINE (E-W) - Specifications 11A-1-1

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

1. SPECIFICATIONS

SERVICE SPECIFICATIONS

Item Standard Limit

Rocker arms, rocker shafts, and camshaft

Camshaft cam SOHC 12-VALVE Intake (primary) 38.78 38.28

height mm Intake (secondary) 38.78 38.28

Exhaust 39.10 38.60

SOHC 16-VALVE Intake 36.99 36.49

Exhaust 36.85 36.35

DOHC Intake 34.67 38.28

Exhaust 34.26 38.60

Camshaft journal diameter mm SOHC 45.93 - 45.94 -

DOHC 25.95- 25.97 -

Cylinder head and valves

Flatness of cylinder head gasket surface mm 0.05 or less -

Cylinder head gasket surface grinding limit (including grinding of

cylinder block gasket surface) mm

- 0.2

Cylinder head overall height mm SOHC 12-VALVE 106.9- 107.1 -

SOHC 16-VALVE 119.9- 120.1 -

DOHC 131.9- 132.1 -

Cylinder head bolt nominal length mm -103.2

Valve margin mm Intake 1.0 0.5

Exhaust 1.5 1.0

Valve stem diameter mm SOHC 12-VALVE 6.6 -

SOHC 16-VALVE 5.5 -

DOHC 5.5 -

Valve stem-to-guide SOHC 12-VALVE Intake 0.020 - 0.050 0.10

clearance mm Exhaust 0.050 - 0.085 0.15

SOHC 16-VALVE Intake 0.020 - 0.047 0.10

Exhaust 0.030 - 0.062 0.15

DOHC Intake 0.020- 0.047 0.10

Exhaust 0.030- 0.062 0.15

Valve face angle 45_- 45.5_-

Valve stem projec- SOHC 12-VALVE Intake 43.70 44.20

tion mm Exhaust 43.30 43.80

SOHC 16-VALVE Intake 53.21 53.71

Exhaust 54.10 54.60

DOHC Intake 48.80 49.30

Exhaust 48.70 49.20

PWEE9520-A

EDec. 1998Mitsubishi Motors Corporation Revised

4G1 ENGINE (E-W) - Specifications

11A-1-2

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

Item LimitStandard

Overall valve length SOHC 12-VALVE Intake 100.75 100.25

mm Exhaust 101.05 105.55

SOHC 16-VALVE Intake 111.56 111.06

Exhaust 114.71 114.21

DOHC Intake 106.35 105.85

Exhaust 106.85 106.35

Valve spring free SOHC 12-VALVE Intake 46.1 45.6

height mm Exhaust 46.8 46.3

SOHC 16-VALVE 50.9 50.4

DOHC 49.1 48.6

Valve spring load/ SOHC 12-VALVE Intake 226/40.0 -

installed height N/

mm Exhaust 284/39.6 -

SOHC 16-VALVE 216/44.2 -

DOHC 177/40.0 -

Valve spring squareness 2_4_

Valve seat contact width mm 0.9- 1.3 -

Valve guide internal diameter mm SOHC 12-VALVE 6.6 -

SOHC 16-VALVE 5.5 -

DOHC 5.5 -

Valve guide projection mm SOHC 12-VALVE 17.0 -

SOHC 16-VALVE 23.0 -

DOHC 23.0 -

Oil pump 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

Pistons and connecting rods

Piston outside diameter mm 4G13 71.0 -

4G15 75.5 -

4G18 76.0 -

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

No. 2 ring 0.02- 0.06 -

Piston ring end gap clearance 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 O. D. mm 18.0 -

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

Crankshaft pin oil clearance mm 0.02- 0.04 0.1

Connecting rod big end side clearance mm 0.10- 0.25 0.4

PWEE9520-A

EDec. 1998Mitsubishi Motors Corporation Revised

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