Valve Guide Replacement Service Points; Valve Stem Seal Installation - Mitsubishi 4G1 Series General Information Manual

Projec-
tion
SOHC 12-VALVE
E
E
Mitsubishi Motors Corporation
Mitsubishi Motors Corporation
4G1 ENGINE (E - W) -
VALVE GUIDE REPLACEMENT SERVICE
POINTS
(1) Using a press, push the valve guide out toward the cylinder
(2) Rebore the valve guide hole in the cylinder head to match
(3) Press-fit the valve guide until it projects by the specified
INSTALLATION SERVICE POINTS
"AA VALVE STEM SEAL INSTALLATION
(1) Install the valve spring seat.
MD998760
(2) Install a new valve stem seal using the special tool shown
Nov. 1995
Aug. 2000
Cylinder Head and Valves
block side.
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.: 12.040 - 12.058 mm
0.25 O.S.: 12.240 - 12.258 mm
0.50 O.S.: 12.490 - 12.508 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
Valve guide hole diameters (DOHC - GDI)
0.05 O.S.: 10.61 - 10.62 mm
0.25 O.S.: 10.81 - 10.82 mm
0.50 O.S.: 11.06 - 11.07 mm
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. (48 mm for intake valve; 55
mm for exhaust valve)
3. After press-fitting the valve guide, insert a new
valve and check that it slides smoothly.
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
PWEE9520-D
11A-9-9
Revised