Content .. 650 651 652 653 ..

Mitsubishi Grandis. Manual - part 652

HOW TO USE THIS MANUAL

ENGINE OVERHAUL

11B-3

ENGINE OVERHAUL

11-54

CRANKSHAFT AND CYLINDER BLOCK

REMOVAL AND INSTALLATION

Section title

Page number

Procedures and cautions for removal, instal-
lation, disassembly, and reassembly are ex-
plained under this category of heading.

The alphabetical character in this category of
heading matches that of the relevant removal
steps, installation steps, disassembly steps, or
reassembly steps.

Denotes non-reusable part.

Tightening torque

CRANKSHAFT AND CYLINDER BLOCK

Removal steps
1.

Flywheel bolt

2. Adapter plate
3.

Flywheel

4. Crankshaft bushing
5.

Drive plate bolt

Adapter plate

Drive plate

Crankshaft bushing

Rear plate

10.

Bell housing cover

>>E<< 11.

Oil seal case

>>D<< 12.

Oil seal

>>A<< THRUST BEARING INSTALLATION

INSTALLATION SERVICE POINTS

AK100786AB

Grooves

Group title

AK303970

AK303794AB

11 ± 1 N·m

132 ± 5 N·m

25 ± 2 N·m

Apply engine oil
to all moving
parts before
installation.

9.0 ± 1.0 N·m

11 ± 1 N·m

→ + 90˚

25 ± 2 N·m

→ + 90˚

132 ± 5 N·m

GENERAL INFORMATION

ENGINE OVERHAUL

11B-4

GENERAL INFORMATION

M1113000100396

VEHICLE AND ENGINE MODELS

GENERAL SPECIFICATIONS

M1113000200638

SERVICE SPECIFICATIONS

M1113000300613

Vehicle name

Vehicle
model

Engine model

Displacement
mL

Specification

Grandis

NA4W

4G69-2

2,378

Single overhead camshaft, 16-valve

Description

Specification

Type

In-line OHV, SOHC

Number of cylinders

Combustion chamber

Pent roof type

Total displacement cm

2,378

Cylinder bore mm

Piston stroke mm

100

Compression ratio

9.5

Valve timing

Intake valve

Opens (BTDC)

° <Low speed cam A>

° <Low speed cam B>

° <High speed cam>

Closes (ABDC)

° <Low speed cam A>

° <Low speed cam B>

° <High speed cam>

Exhaust valve

Opens (BBDC)

Closes (ATDC)

Lubrication system

Pressure feed, full-flow filtration

Oil pump type

Involute gear type

Item

Standard value

Limit

Timing belt
Auto tensioner rod length mm

3.8

− 4.5

−

Auto-tensioner rod projection length mm

−

Auto-tensioner rod pushed-in amount [When pushed with a
force of 98

− 196 N] mm

1.0 or less

−

Valve clearance mm

Intake

0.11

−

Exhaust

0.20

−

Rocker arms and camshaft

SERVICE SPECIFICATIONS

ENGINE OVERHAUL

11B-5

Camshaft cam height mm

Intake

Low speed
cam A

34.41

Minimum 33.91

Low speed
cam B

37.47

Minimum 36.97

High speed
cam

37.21

Minimum 36.71

Exhaust

37.86 Minimum

37.36

Camshaft journal outside diameter mm

−

Cylinder head and valves
Cylinder head flatness of gasket surface mm

Less than 0.03

0.2

Cylinder head grinding limit of gasket surface mm (Total
resurfacing depth of cylinder head and cylinder block)

−

0.2

Cylinder head overall height mm

120

−

Cylinder head bolt shank length mm

−

99.4

Valve thickness of valve head
(margin) mm

Intake

1.0

Minimum 0.5

Exhaust

1.2

Minimum 0.7

Valve overall height mm

Intake

111.33

Minimum 110.83

Exhaust

113.54 Minimum

113.04

Valve stem outside diameter mm

6.0

−

Valve thickness to valve guide
clearance mm

Intake

0.02

− 0.04

0.10

Exhaust

0.04

− 0.06

0.15

Valve face angle mm

43.5

° − 44°

−

Valve spring free length mm

Intake

54.8

Minimum 53.8

Exhaust

56.1 Minimum

55.1

Valve spring load/installed height
N/mm

Intake

235/44.2

−

Exhaust

226/44.2

−

Valve spring out-of-squareness

° or less

Valve seat valve contact width mm

0.9

− 1.3

−

Valve guide inside diameter mm

6.0

−

Valve guide projection from cylinder head upper surface
mm

14.0

−

Valve stem projection mm

Intake

48.33

48.83

Exhaust

48.34

48.84

Oil pan and oil pump
Oil pump side clearance mm

Drive gear

0.08

− 0.14

−

Driven gear

0.06

− 0.12

−

Oil pressure at curb idle speed kPa
[oil temperature is 75 to 90

°]

78 or more

−

Piston and connecting rod
Piston outside diameter mm

−

Item

Standard value

Limit

REWORK DIMENSIONS

ENGINE OVERHAUL

11B-6

REWORK DIMENSIONS

M1113024300253

Piston ring side clearance mm

No. 1

0.03

− 0.07

0.1

No. 2

0.02

− 0.06

0.1

Piston ring end gap mm

No. 1

0.15

− 0.30

0.8

No. 2

0.28

− 0.43

0.8

Oil ring side rail

0.10

− 0.40

1.0

Piston pin outside diameter mm

22.0

−

Piston pin press-in load N (Room temperature)

7,350

− 17,200

−

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 and cylinder block
Crankshaft end play mm

0.05

− 0.25

0.40

Crankshaft journal outside diameter mm

57.0

−

Crankshaft pin outside diameter mm

45.0

−

Crankshaft journal oil clearance mm

0.02

− 0.04

0.1

Bearing cap bolt shank length mm

−

71.1

Piston to cylinder clearance mm

0.02

− 0.04

−

Cylinder block flatness of gasket surface mm

0.05

0.1

Cylinder block grinding limit of gasket surface mm (Total
resurfacing depth of both cylinder head and cylinder block)

−

0.2

Cylinder block overall height mm

284

−

Cylinder block inside diameter mm

87.0

−

Cylindricity mm

0.01

−

Item

Standard value

Limit

Item

Standard value

Cylinder head And valves
Diameter of oversize valve seat ring hole in cylinder head
mm

Intake

0.3 oversize

35.30

− 35.33

0.6 oversize

35.60

− 35.63

Exhaust

0.3 oversize

33.30

− 33.33

0.6 oversize

33.60

− 33.63

Diameter of oversize valve guide hole in cylinder head mm

0.05 oversize

11.05

− 11.07

0.25 oversize

11.25

− 11.27

0.50 oversize

11.50

− 11.52

Content .. 650 651 652 653 ..