Specifications

4M41 ENGINE -
Cylinder Head and Valve Mechanism
11B-16-12
2. VALVE SEAT
(1) Valve Seat Width
Replace the valve seat
27
,
28
if the specified service
limit is exceeded.
A
: Valve seat width
Standard value: 1.8 - 2.2 mm
Limit: 2.8 mm
Caution
When the valve seat 27, 28 has been corrected or
replaced, lap it and the valve 23, 24 for proper seating.
(2) Valve Sinkage from Cylinder Head Bottom
If the specified service limit is exceeded, correct or replace
the defective part.
B
: Valve sinkage
Standard value: 0.05 - 0.55 mm
Limit: 0.8 mm
3. VALVE AND VALVE GUIDE
If the clearance exceeds the specified service limit, replace
the defective part.
Standard value:
Intake 0.02 - 0.06 mm
Exhaust 0.05 - 0.09 mm
Limit:
Intake 0.10 mm
Exhaust 0.15 mm
4. VALVE AND VALVE SEAT
(1) Apply an even coat of minium to the valve seating surface
A
of the valve seat
27
,
28
.
(2) Strike the valve
23
,
24
against the valve seat
27
,
28
once while taking care that the valve is not rotated.
B
: Valve Lapper
Caution
Before proceeding with the contact check, examine
the valve 23, 24 and valve guide 27, 28 in detail to
see if they are in normal condition.
(3) Determine the valve seating condition from minium pattern
printed on th e valve
23
,
24
. If any abnormal contact is
found, take the following corrective action.
Condition Corrective action
Minor defect Lap valve for better seating.
Major defect Correct or replace valve and valve
seat.
PWEE9409-D
E
Feb. 2000Mitsubishi Motors Corporation Added
23, 24
27, 28
A
23, 24
27, 28
B
23, 24
25, 26
A
B
23, 24