Specifications

4M41 ENGINE -
Cylinder Head and Valve Mechanism
11B-16-13
5. CYLINDER HEAD ASSEMBLY
Measure the distortion of t h e bottom surface of t h e cylinder
head
31
. If the measured value exceeds the limit, replace
the cylinder head.
Standard value: 0.05 mm or less
Limit: 0.2 mm
CORRECTION
1. INTAKE VALVE AND EXHAUST VALVE
Caution
1. The grinding should be minimum.
2. If the valve margin deviates from the specified
service limit after grinding, replace the valve 23,
24.
3. After grinding, lap the valve 23, 24 and valve seat
27, 28 for proper seating.
2. VALVE SEAT
(1) Grind the valve seat
27
,
28
using a valve seat cutter
or a valve seat grinder.
(2) Polish the ground surface lightly using a #400 sandpaper
held between the cutter and valve seat.
(3) Correct the seat width
C
of the valve
23
,
24
to the specified
value using a 15 _ or 75_ cutter.
D
: Valve seat angle
Standard value: 45
_
±
15’
Caution
1. Be sure that the sinkage E of the valve 16, 17
does not exceed the specified service limit as
a result of the correction.
Limit: 0.8 mm
2. After the correction, lap the valve 23, 24 and valve
seat 27 , 28 for proper seating.
3. VALVE AND VALVE SEAT
Lap the valve and valve seat as follows:
(1) Apply a thin coat of lapping compound evenly to the
valve seating surface
A
of the valve seat
27
,
28
.
Caution
1. Keep the stem C of the valve 23, 24 free from
the lapping compound.
2. Use an intermediate-mesh compound (120 -
150 meshes) first, then a fine-mesh compound
(over 200 meshes).
3. To achieve even application of the lapping
compound, a mix with a small quantity of
engine oil is recommended.
PWEE9409-D
E
Feb. 2000Mitsubishi Motors Corporation Added
E
D
23, 24
27, 28
C
23, 24
A
C