Mitsubishi S4S Service Manual page 72

ENGINE MAIN PARTS
(10) Measuring cylinder head warpage
Using a heavy accurate straight edge and feeler
gages, check the gasket contact surface for
warpage in two positions lengthwise, two
crosswise and two widthwise as shown in the
illustration. If the warpage exceeds the repair
limit, reface the head with a surface grinder.
Unit: mm [in.]
Item
Assembly Repair
Standard Limit
Warpage of gasket 0.05 [0.0020] 0.20
contact surface or less [0.0079]
Measuring cylinder head warpage
(11)
Measuring valve pushrod deflection
Measure the pushrod deflection with a V-block
and a dial indicator as shown in the illustration.
If the dial indicator reading exceeds the assembly
standard, replace the pushrod.
Item
Deflection (dial indicator
reading) of valve pushrod
Unit: mm [in.]
Assembly Standard
0.3 [0.012] or less
Measuring valve pushrod deflection
Installing valve stem seal
1.3 Reassembly
(1)
Installing valve stem seal
After installing the valve in position, install the
seal to the valve guide with stem seal installer
(32A91-10200).
. . - - - - - - - l (
LÏ:,CAUTION11---------,
a) Do not put any oil or sealant on the face of
the stem seal that comes in contact with the
valve guide. When installing the seal, put
engine oil on the seal contact surface of the
stem to ensure initiallubrication of the stem
seallip.
b) Do not remove the valve after the seal has
been installed in position to prevent damage
to the seallip.
7-10
Stem seal instalIer
Valve
Valve stem seal
Valve guide