Mitsubishi 4G9 User Manual

Items

Standard value

Limit

Cylinder head gasket surface flatness mm

Less than 0.03

0.2

Grinding limit of cylinder head gasket surface mm
*Total resurfacing depth of both cylinder head and cylinder block

–

0.2*

Cylinder head overall height mm

SOHC

119.9 – 120.1

–

DOHC

131.9 – 132.1

–

DOHC–MIVEC

119.8 – 120.0

–

DOHC–GDI

131.9 – 132.1

–

Thickness of valve
head (margin) mm

SOHC

Intake

1.0

0.5

head (margin) mm

Exhaust

1.3

0.8

DOHC

Intake

1.0

0.5

Exhaust

1.2

0.7

Valve overall height
mm

SOHC

Intake

110.15

109.65

mm

Exhaust

113.70

113.20

DOHC

Intake

104.19

103.69

Exhaust

103.87

103.37

DOHC–MIVEC

Intake

115.63

115.13

Exhaust

115.63

115.13

DOHC–GDI

Intake

104.19

103.69

Exhaust

103.87

103.37

Valve spring free length mm

SOHC (with lash ad-
juster)

50.9

49.9

SOHC (with adjust-
ing screw)

49.5

48.5

DOHC

45.0

44.0

DOHC–MIVEC

51.5

50.5

DOHC–GDI

44.8

43.8

Valve spring out-of-squareness

Max. 2

_

4

_

Valve stem to valve
guide clearance mm

Except DOHC–GDI
for PAJERO io

Intake

0.02 – 0.05

0.10

guide clearance mm

for PAJERO io

Exhaust

0.05 – 0.09

0.15

DOHC–GDI 
for PAJERO io

Intake

0.02 – 0.05

0.10

for PAJERO io

Exhaust

0.04– 0.06

0.15

Valve seat valve contact width mm

0.9 – 1.3

–

Valve guide projection from cylinder head

pper s rface mm

SOHC

14.0

–

upper surface mm

DOHC

19.0

–

E