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11A-0-1
ENGINE
4G1 SERIES
CONTENTS
GENERAL INFORMATION ........................................... 11A-0-3
.................................................
1. SPECIFICATIONS 11A-1-1
SERVICE SPECIFICATIONS .................................... 11A-1-1
REWORK DIMENSIONS ........................................ 11A-1-3
TORQUE SPECIFICATIONS ..................................... 11A-1-4
NEW TIGHTENING METHOD-BY USE OF BOLTS TO BE
TIGHTENED IN PLASTIC AREA ............................... 11A-1-6
SEAL
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11A-0-2 NOTES E Mitsubishi Motors Corporation Nov. 1995 PWEE9520
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11A-0-3 4G1 ENGINE (E-W) - General Information GENERAL INFORMATION E Mitsubishi Motors Corporation Nov. 1995 PWEE9520
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11A-0-4 4G1 ENGINE (E-W) - General Information E Mitsubishi Motors Corporation Nov. 1995 PWEE9520
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11A-0-5 4G1 ENGINE (E-W) - General Information Descriptions 4G1312-VALVE-CARBURETOR 4G1312-VALVE-MPI Type In-line OHV, SOHC In-line OHV, SOHC Numberof cylinders 4 4 Combustion chamber Pentrooftype Pentrooftype 3 Totaldisplacement dm 1,299 1,299 Cylinder bore mm 71.0 71.0 Pistonstrokemm 82.0 82.0 Compressionratio 9.5 9.5 Number of Intake 8 8 valves Exhaust 4 4 Valvetiming Intakeopens BTDC14_ BTDC19_ Intakecloses ABDC48_ ABDC43_ Exhaustopens BBDC55_ BBDC60_ Exhaustcloses ATDC13_ ATDC8_ Lubrication
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11A-0-6 4G1 ENGINE (E-W) - General Information Descriptions 4G1316-VALVE-MPI 4G1816-VALVE-MPI Type In-line OHV, SOHC In-line OHV, SOHC Numberof cylinders 4 4 Combustion chamber Pentrooftype Pentrooftype 3 Totaldisplacement dm 1,299 1,584 Cylinder bore mm 71.0 76.0 Pistonstrokemm 82.0 87.3 Compressionratio 10 9.5 Number of Intake 8 8 valves Exhaust 8 8 Valvetiming Intakeopens BTDC17_ BTDC17_ Intakecloses ABDC39_ ABDC39_ Exhaustopens BBDC49_ BBDC49_ Exhaustcloses ATDC7_ ATDC7_ Lubricationsystem Pr
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11A-0-7 4G1 ENGINE (E-W) - General Information Descriptions 4G15-CARBURETTOR 4G15-MPI Type In-line OHV, SOHC In-line OHV, DOHC Numberof cylinders 4 4 Combustion chamber Semisphericaltype Pentrooftype 3 Totaldisplacement dm 1,468 1,468 Cylinder bore mm 75.5 75.5 Pistonstrokemm 82.0 82.0 Compressionratio 9.0 9.5 Number of Intake 8 8 valve Exhaust 4 8 Valvetiming Intakeopens BTDC14_ BTDC16_ Intakecloses ABDC48_ ABDC40_ Exhaustopens BBDC55_ BBDC45_ Exhaustcloses ATDC13_ ATDC15_ Lubricationsystem Pre
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NOTES
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11A-1-1 4G1 ENGINE (E-W) - Specifications 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 o
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11A-1-2 4G1 ENGINE (E-W) - Specifications Item Standard Limit 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/ Exhaust 284/39.6 - mm mm SOHC 16-VALVE 216/44.2 - DOHC 177/40.0 -
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11A-1-2a 4G1 ENGINE (E-W) - Specifications Item Standard Limit Crankshaft and cylinder block Crankshaft end play mm 0.05-0.18 0.25 Crankshaft journal diameter mm 48.0 - Crankshaft pin diameter mm 42.0 - Crankshaft journal oil clearance mm 0.02-0.04 0.1 Cylinder block gasket surface flatness mm 0.05 or less - Cylinder block gasket surface grinding limit (including grinding of - 0.2 cylinder head gasket surface) mm Cylinder block overall height mm 256 - Cylinder block cylindricity mm 0.01 - Cylind
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11A-1-2b 4G1 ENGINE (E-W) - Specifications Intentionallyblank E Mitsubishi Motors Corporation Nov. 1995 PWEE9520 E E Mitsubishi Mitsubishi Motors Motors Corporation Corporation Dec. Dec. 1998 1998 PWEE9520-A PWEE9520-A Added Added
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11A-1-3 4G1 ENGINE (E-W) - Specifications REWORK DIMENSIONS Item Standard Limit Cylinder head and valves Cylinder head oversize valve guide SOHC 12-VALVE 0.05O. S. 12.050-12.068 - hole diameter mm 0.25O. S. 12.250-12.268 - 0.50O. S. 12.500-12.518 - SOHC 16-VALVE 0.05O. S. 10.550-10.568 - 0.25O. S. 10.750-10.768 - 0.50O. S. 11.000-11.018 - DOHC 0.05O. S. 10.550-10.568 - 0.25O. S. 10.750-10.768 - 0.50O. S. 11.000-11.018 - Oversizevalveseat SOHC Intake (primary) 0.3 O. S. 27.300-27.325 - ring hole
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11A-1-4 4G1 ENGINE (E-W) - Specifications TORQUE SPECIFICATIONS Item Nm Alternator and ignition system Water pump pulley bolt 9 Alternator brace (alternator side) 22 Alternator brace (tightened withwaterpump) 23 Alternator pivotbolt 44 Oil level gauge guide 23 Crankshaft bolt 125 Sparkplug 25 Distributor 11 Ignition coil 10 Camshaftposition sensor 9 Camshaftposition sensor support 13 Camshaftposition sensing cylinder 21 Timing belt Timing beltcover 11 Timing belttensioner 23 Crankshaft angle sen
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11A-1-5 4G1 ENGINE (E-W) - Specifications Item Nm Thermovalve 27 Water temperature gauge unit 11 Water temperature sensor 29 Water pump 13 Exhaust manifold and intake manifold Boost sensor 5 Solenoid valve assembly 9 Intake manifold 17 Intake manifold stay (MPI) M8 17 M10 21 Intake manifold stay (carburetor) 29 Exhaustmanifold cover 29 Exhaustmanifold M8 17 M10 29 Oxygensensor 44 Rocker arms, rocker shafts, and camshaft Fuelpump cover 12 Rocker cover 4 Rocker shaft assembly 31 Adjusting screw 15
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11A-1-5a 4G1 ENGINE (E-W) - Specifications Item Nm Crankshaft and cylinder block Flywheel 132 Drive plate 132 Rear plate 10 Bell housing cover 10 Rear oil seal case 11 Bearing capbolt 51 Oil pressure switch 18 Knocksensor 23 E Mitsubishi Motors Corporation Nov. 1995 PWEE9520 E Mitsubishi Motors Corporation Dec. 1998 PWEE9520-A Added
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11A-1-5b 4G1 ENGINE (E-W) - Specifications Intentionallyblank E Mitsubishi Motors Corporation Nov. 1995 PWEE9520 E E Mitsubishi Mitsubishi Motors Motors Corporation Corporation Dec. Dec. 1998 1998 PWEE9520-A PWEE9520-A Added Added
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11A-1-6 4G1 ENGINE (E-W) - Specifications NEW TIGHTENING METHOD USING PLASTIC REGION TIGHTENING BOLTS Parts of the engine use plastic region tightening bolts. The tightening procedure for these is different from that of conventional bolts and is described in relevant parts of this manual. Note that plastic region tightening bolts have fixed service limits. These limits are indicated in relevant parts of this manual and must be strictly observed. D Plastic region tightening bolts are used for the
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11A-1-7 4G1 ENGINE (E-W) - Specifications FORM-IN-PLACE GASKET The engine has several areas where the form-in-place gasket (FIPG) is in use. To ensure that the gasket fully serves its purpose, it is necessary to observe some precautions when applying the gasket. Bead size, continuity and location are of paramount importance. Too thin a bead could cause leaks. Too thick a bead, on the other hand, could be squeezed out of location, causing blocking or narrowing of the fluid feed line. To eliminate
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