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TM 10-3930-638-24&P
4-2. ENGINE MAINTENANCE (cont)
b. Cylinder Head and Valves (cont).
STEP
LOCATION
ITEM
ACTION
REMARKS
INSPECTION AND REPAIR (cont)
h. Studs (13)
Inspect
Inspect for bent condition and damaged
(cont)
threads. If bent or threads damaged, re-
place. Replace by unscrewing stud and
screwing new stud into cylinder head
8
Exhaust valve
a. Overall
Inspect
Replace if valve stem is nicked, valve face
(6) and intake
grooved, heavy carbon and/or varnish
valve (7)
deposits, rust or pitting on valve stem or
valve face, burned valve face, or dished
valve head. Fine pitting on surface of
valve face or seat is normal
b. Ret airier groove
Replace if worn or if stem tip is worn
Inspect
Measure stem
c. Stem diameter
Three places as shown. Replace exhaust
valve (6) if less than 0.3389 inch. Re-
diameter
place intake valve (7) if less than 0.3399
inch
4-13

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