Mitsubishi L200. Manual - part 44
CYLINDER HEAD AND VALVES
ENGINE OVERHAUL
11B-50
1. Before correcting the valve seat, check for
clearance between the valve guide and valve and,
if necessary, replace the valve guide.
2. Using the seat grinder, correct to obtain the
specified seat width and angle.
3. After correction, valve and valve seat should be
lapped with a lapping compound.
VALVE SEAT REPLACEMENT PROCEDURE
AK400379 AC
0.5 - 1 mm
Cut away
0.5 - 1 mm
1. Cut the valve seat to be replaced from the inside
to thin the wall thickness. Then, remove the valve
seat.
AK400380AD
Valve seat
height
Oversize hole diameter
2. Rebore the valve seat hole in cylinder head to the
oversize valve seat diameter.
Intake valve seat hole diameter:
0.30 O.S.: 33.300
− 33.325 mm
Exhaust valve seat hole diameter:
0.30 O.S.: 29.300
− 29.321 mm
3. When the valve sheet is a press fit, engine oil is
applied to the valve sheet or the cylinder head not
to damage the inside diameter of the cylinder
head.
4. Using valve seat cutter, correct the valve seat to
the specified width and angle.
See "VALVE SEAT RECONDITIONING
PROCEDURE."
VALVE GUIDE REPLACEMENT PROCEDURE
1. Force out the valve guide toward the cylinder
block using a press.
CAUTION
Do not use a replacement valve guide of the
same size as the removed one.
2. Machine the valve guide hole in the cylinder head
to the size matched to the selected oversize valve
guide.
Valve guide hole diameter:
0.05 O.S.: 11.050
− 11.068 mm
NOTE: Do not install a valve guide of the same
size again.
AK500586AB
Protrusion
Protrusion
3. Press-fit the valve guide until it remains protruded
above the cylinder head by the amount indicated
in the illustration.
Protrusion: 18.3
− 18.9 mm
NOTE: Press the valve guide from above the cyl-
inder head.
NOTE: The valve guides for the intake valves are
different in length from those for the exhaust
valves (45.2 mm for intake valves; 48.2 mm for
exhaust valves)
4. After installing the valve guide, insert a new valve
in it to check for smooth movement.