Mitsubishi 4G1 series Configuration guide

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 SYSTEMS 11A-5-1

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5a. INTAKE MANIFOLD AND THROTTLE BODY (GDI) 11A-5a-1

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5b. EXHAUST MANIFOLD (GDI) 11A-5b-1

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

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

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7a. FUEL SYSTEM (GDI) 11A-7a-1

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

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8a. ROCKER ARMS AND CAMSHAFTS (GDI) 11A-8a-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. PISTONS AND CONNECTING RODS 11A-11-1

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

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11A-0-1

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

ENGINE

4G1 SERIES

CONTENTS

PWEE9520-D

EAug. 2000Mitsubishi Motors Corporation Revised

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

PWEE9520

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–CARBURETOR 4G13 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 1,299

Cylinder bore mm 71.0 71.0

Piston stroke mm 82.0 82.0

Compression ratio 9.5 10, 9.5*1

Number of

valves

Intake 8 8

ves Exhaust 8 8

Valve timing Intake opens BTDC 12_BTDC 17_

Intake closes ABDC 48_ABDC 39_

Exhaust opens BBDC 48_BBDC 49_

Exhaust closes ATDC 12_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

*1: LANCER for General Export

PWEE9520-E

EFeb. 2001Mitsubishi Motors Corporation Revised

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

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

Descriptions 4G15–

CARBURETTOR 4G15–MPI

12-VALVE 4G15–MPI

16-VALVE 4G15–GDI

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

Number of cylinders 4 4 4 4

Combustion chamber Semi spherical type Semi spherical type Pentroof type Pentroof + Curved

piston head

Total displacement dm31,468 1,468 1,468 1,468

Cylinder bore mm 75.5 75.5 75.5 75.5

Piston stroke mm 82.0 82.0 82.0 82.0

Compression ratio 9.0 9.0 9.5 11.0

Number

valves

Intake 8 8 8 8

ves Exhaust 4 4 8 8

Valve

timing Intake opens BTDC 14_BTDC 14_,

BTDC 13_*1BTDC 16_BTDC 12_

Intake closes ABDC 48_ABDC 48_,

ABDC 47_*1ABDC 40_ABDC 44_

Exhaust

opens BBDC 55_BBDC 55_,

BBDC 56_*1BBDC 45_BBDC 48_

Exhaust

closes ATDC 13_ATDC 13_,

ATDC 8_*1ATDC 15_ATDC 12_

Lubrication system Pressure feed,

full-flow filtration Pressure feed,

full-flow filtration

Oil pump type Trochoid type Trochoid type Trochoid type Trochoid type

Cooling system Water-cooled,

forced circulation Water-cooled,

forced circulation

Water pump type Centrifugal impeller

type Centrifugal impeller

type

*1: Special low-emission engines on vehicles for Australia

PWEE9520-E

EFeb. 2001Mitsubishi Motors Corporation Revised

4G1 ENGINE (E–W) – General Information

11A-0-8

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

Descriptions 4G18 16-VALVE–CARBURETOR 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 dm31,584 1,584

Cylinder bore mm 76.0 76.0

Piston stroke mm 87.3 87.3

Compression ratio 9.5 9.5, 10*1*2

Number of

valves

Intake 8 8

ves Exhaust 8 8

Valve timing Intake opens BTDC 12_BTDC 17_, BTDC 9_*1, BTDC 17_*2

Intake closes ABDC 48_ABDC 39_, ABDC 51_*1, ABDC 43_*2

Exhaust opens BBDC 48_BBDC 49_, BBDC 49_*1, BBDC 53_*2

Exhaust closes ATDC 12_ATDC 7_, ATDC 15_*1, ATDC 7_*2

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

*1: SPACE STAR for Europe

*2: LANCER for General Export

PWEE9520-E

EFeb. 2001Mitsubishi Motors Corporation Revised

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

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

1. SPECIFICATIONS

SERVICE SPECIFICATIONS

Item Standard Limit

Rocker arms and camshaft

Camshaft cam

height mm

SOHC 12-VALVE Intake (primary) 38.78 38.28

height mm Intake (secondary) 38.78 38.28

Exhaust*139.01 38.51

Exhaust*238.97 38.47

SOHC 16-VALVE*3Intake 36.99 36.49

Exhaust 36.85 36.35

SOHC 16-VALVE*4Intake 36.86 36.36

Exhaust 36.68 36.18

SOHC 16-VALVE*5Intake 37.30 36.80

Exhaust 37.16 36.66

SOHC 16-VALVE*6Intake 37.17 36.67

Exhaust 36.99 36.49

DOHC Intake 34.67 34.17

Exhaust 34.26 33.76

DOHC GDI Intake 34.85 34.35

Exhaust 34.59 34.09

Camshaft journal diameter mm SOHC 45.93–45.94 –

SOHC 16-VALVE*744.93–44.94 –

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 –

*1: With low pollution system

*2: Without low pollution system

*3: Except 2001 model front wheel drive vehicles

*4: 2001 model front wheel drive vehicles for Europe

*5: 2001 model front wheel drive vehicles for General Export

*6: 2002 model front wheel drive vehicles for Europe

*7: SOHC 16-VALVE MPI for Europe

PWEE9520-E

EFeb. 2001Mitsubishi Motors Corporation Revised

4G1 ENGINE (E- W) - Specifications

11A-1-2

PWEE9520

ENov. 1995Mitsubishi Motors Corporation

Item LimitStandard

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

clearance mm Exhaust 0.035- 0.050 0.15

SOHC 16-VALVE Intake 0.020 - 0.047 0.10

Exhaust 0.030 - 0.057 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

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

PWEE9520-C

EApr. 2000Mitsubishi Motors Corporation Revised

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