CYLINDER HEAD & VALVES
MEASURE VALVE SPRING FREE LENGTH
Free Length: 59.4 mm (2.34 in.)
Insert valve spring into spring test loader,
as shown in Fig. 33.
MEASURE MAXIMUM SPRING LENGTH IN USE
Maximum length in use:
(66 to 70 lbs.)
Minimum length in use:
694 to 730 N
@ (156-164 lbs.)
Replace any spring which is rusted, pitted,
cracked or incapable of meeting tension
requirements set forth.
NOTE: Valve spring tension can be tested in a
spring tester or while assembled on the engine.
Figure 33. - Testing Valve Springs
Inspect Valve Spring Locks as follows:
Clean valve spring locks in a suitable
Check inside ribs of lock for wear which
may cause looseness.
Check outside of locks for wear which
might allow valve spring retainer to slide
NOTE: Wear on outside surface of locks can be
caused by overspeeding engine.
Replace any worn locks.
Inspect Valve Rotators (Roto Coil) as follows:
To properly test the rotator for function, a
valve spring load must be applied to the
Place the valve spring, with the roto coil, in
the spring tester. Place a bearing ball
between the roto coil and ram of the spring
tester, as shown in Fig. 30.
Compress valve spring and observe roto
coil as it turns counterclockwise.
Replace any roto coil which does NOT turn.
Check oil seal (if equipped) for wear and
replace if necessary.
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