Figure 3-44. Valves and injector operating mechanism,

TM 10-3930-242-34

Figure 3-44. Valves and injector operating mechanism,

d . Remove Exhaust Valve. With the cylinder

dition, use a block of wood under cylinder head

head removed from the engine, and the valve

t o support exhaust valve.

(f) Remove cam followers and push rod

springs removed as outlined above, turn the cy-

a s s e m b l i e s (para 3-15).

l i n d e r head over and withdraw the exhaust val-

c. Inspect Exhaust Valve Spring. A f t e r r e -

ves.

e . Inspect Exhaust Valves. Scrape the carbon

moving valve spring, clean with fuel oil and dry

f r o m valve stem, wash with clean fuel oil, and

w i t h compressed air. Check spring for pitted or

f r a c t u r e d coils. Replace defective springs. The

c h e c k for scratches or scuff marks. The diame-

exhaust valve spring has an approximate free

ter of a new valve stem is 0.2480-to-0.2488-inch.

length of 2.08 inches when new, and requires a

Valve faces should be smooth, unpitted and free

load of 29 2 pounds to compress it to 1.93-inch

o f ridges or cracks. Carbon on the face of the

length.

v a l v e indicates a faulty seat and a resultant