MerCruiser GM4 Service Manual page 111

6. While compressing valve spring with valve spring
compressor, install oil seal in lower groove of
valve stem, making sure seal is not twisted. A light
coating of oil will help prevent twisting.
a - Valve Spring Compressor (J-8062)
7. Install valve locks (grease may be used to hold
them in place) and slowly release tool, making
sure locks seat properly in upper grooves of valve
stem.
1
2
5
9
1 - Valve Locks
2 - Retainer
3 - Rotator
4 - Cap
5 - Valve Guide Oil Seal
6 - Valve Stem Oil Seal
7 - Damper
8 - Outer Spring
Index
90-816462 2-695
a
72884
1
3
4
6
7
8
10
72882
9 - Intake Valve
10 -Exhaust Valve
8. Check installed height of valve springs using a
narrow, thin scale. Measure from spring seat to
top of valve spring, as shown. If measurement ex-
ceeds specified height, install a valve spring shim
and recheck. DO NOT shim valve springs to give
an installed height less than the minimum speci-
fied.
a
a - Cut Out This Portion
a - Valve Spring Installed Height
Checking Valve Spring Installed Height
05037
a
72339
ENGINES - 3A - 21