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4G1 ENGINE (E-W) -
Cylinder Head and Valves
11A-9-4
PWEE9520
E
Nov. 1995Mitsubishi Motors Corporation
A
C
"
VALVE STEM SEAL REMOVAL
INSPECTION
1. CYLINDER HEAD
(1) Before cleaning the cylinder head, check it for water leaks,
gas leaks, cracks, and other damage.
(2) Remove all oil, water scale, sealant, and carbon. After
cleaning the oil passages, blow air through them to verify
that they are not blocked.
(3) Check for distortion in the cylinder head gasket surface
using a straight edge and thickness gauge. If distortion
exceeds the specified limit, grind the gasket surface to
specification.
Gasket surface distortion
Standard value: 0.05 mm or less
Limit: 0.2 mm
Grinding limit: 0.2 mm
Cylinder head height (specification when new):
SOHC 12-VALVE: 106.9 - 107.1 mm
SOHC 16-VALVE: 119.9 - 120.1 mm
DOHC: 131.9 - 132.1 mm
Caution
No more than 0.2 mm of stock may be removed from
the cylinder head and cylinder block mating surfaces
in total.
2. VALVES
(1) Check the valve face for correct contact. If contact is
uneven or incomplete, reface the valve seat.
(2) If the margin is less than specified, replace the valve.
Standard value:
Intake
:
1.0 mm
Exhaust: 1.5 mm
Limit:
Intake: 0.5 mm
Exhaust: 1.0 mm
PWEE9520-A
E
Dec. 1998Mitsubishi Motors Corporation Revised
Contact (must
be in center of
face)
Margin
6EN0542