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4G1 ENGINE (E-W) -
Cylinder Head and Valves
11A-9-8
PWEE9520
E
Nov. 1995Mitsubishi Motors Corporation
VALVE GUIDE REPLACEMENT SERVICE
POINTS
(1) Using a press, push the valve guide out toward the cylinder
block side.
(2) Rebore the valve guide hole in the cylinder head to match
the oversize valve guide that is to be fitted.
Caution
Do not install a valve guide of the same size again.
Valve guide hole diameters (SOHC 12-VALVE)
0.05 O.S.: 12.050 - 12.068 mm
0.25 O.S.: 12.250 - 12.268 mm
0.50 O.S.: 12.500 - 12.518 mm
Valve guide hole diameters (SOHC 16-VALVE, DOHC)
0.05 O.S.: 10.550 - 10.568 mm
0.25 O.S.: 10.750 - 10.768 mm
0.50 O.S.: 11.000 - 11.018 mm
(3) Press-fit the valve guide until it projects by the specified
amount.
Standard value:
SOHC 12-VALVE: 17 mm
SOHC 16-VALVE, DOHC: 23 mm
Caution
1. The valve guide must be installed from the upper
side of the cylinder head.
2. The valve guides differ in length on the intake
and exhaust sides.
3. After press-fitting the valve guide, insert a new
valve and check that it slides smoothly.
INSTALLATION SERVICE POINTS
"
A
A
VALVE STEM SEAL INSTALLATION
(1) Install the valve spring seat.
(2) Install a new valve stem seal using the special tool shown
in the illustration.
Caution
1. Valve stem seals cannot be reused.
2. The valve stem seal must be installed using the
correct special tool. Incorrect installation could
result in oil leaking past the valve guide.
PWEE9520-A
E
Dec. 1998Mitsubishi Motors Corporation Revised
Projec-
tion
MD998760
SOHC 12-VALVE
SOHC 16-VALVE, DOHC
MB991671