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TM 10-4320-351-14
i.
Install intake and exhaust valve rings (8).
j.
Install intake and exhaust valve guide seals (9).
k.
Install intake and exhaust lower valve spring retainers (10).
l.
Install intake valve (4) in valve guide (5) and exhaust valve (6) in valve guide (7). Position both valves in cylinder
head (1).
NOTE
Depth measurement between valve faces and cylinder head surface is critical. If
not within tolerance, piston and valve may strike each other and cause damage.
m.
Using a depth micrometer, check depth of valve faces (11 and 12) relative to cylinder head surface (13). The
measurements must be 0.031 to 0.051 in. (0.8 to 1.3 mm).
n.
Assemble valve spring (14) and upper valve spring retainer (15). Install intake valve (4) stem. Use valve spring
compressor or equivalent to push down on upper valve spring retainer (15) and install valve cotters (16).
o.
Repeat procedure (step n) for exhaust valve (6).
NOTE
For clarity of illustration, the exhaust rocker arm assembly is not illustrated.
Assembly is the same as the intake rocker arm (19).
p.
Loosely install rocker arm adjusting screw (17) and jam nut (18) in rocker arm (19). The rocker arm screw (17)
and jam nut (18) will be secured during valve adjustment procedure.
q.
Install rocker arm (19) in cylinder head (20).
r.
Install rocker arm journal (21) through cylinder head and into rocker arm (19) with new copper washer (22).
s.
Position spacer (23) flush on decompression arm (24) shaft.
t.
Lightly lubricate with petrolatum and install O-ring (25) on decompression arm (24).
u.
Mate small hole (26) in decompression arm (24) with tang (27) on spring (28) and slide decompression arm into
place in cylinder head (20).
v.
Install screw (29) to attach decompression arm (24) to cylinder head (20).
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