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TM 10-3930-643-34
ENGINE, FUEL, EXHAUST AND COOLING TROUBLESHOOTING AND MAINTENANCE.
4-4.
Cylinder Head Assembly with Valves. (Sheet 11 of 18)
DISASSEMBLY/CLEANING/INSPECTION
NOTE
Valve springs are tested on spring
tester.
36.
Check 12 springs (11) and spring
seats (12) for rust, pitting and
cracks.
Replace if rusted, pitted or
cracked.
37.
Measure free length of springs (11).
Free length should be 2.34 inches.
38.
Apply 66 to 70 lbs.
pressure to
springs (11) in
spring
resiliency
tester and measure length
(maximum
length with valve open). Spring (11)
length should be 2.007 inches.
39.
Apply 156 to 164 lbs. pressure to
springs (11) in
spring
resiliency
tester and measure length
(minimum
length with valve open).
Spring
length should be 1.552 inches.
40.
Inspect 24 keys (8) inside rib and
outside of 24 keys (8). Replace if
worn.
41.
Inspect 12 rotors (9).
Place springs
(11) with rotor (9) in spring tester.
42.
Place ball bearing between rotor and
ram of spring tester.
43.
Compress valve spring (11) and
observe motion of
rotor.
Rotor
should
turn
counterclockwise.
Replace rotors which do not turn.
44.
Check oil seal on rotor for wear.
Replace rotor with worn seal.
Go to sheet 12
4-39
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