TM 9-2815-225-34&P
3-35. CYLINDER HEAD AND VALVE REPAIR (Contd)
LOCATION/ITEM
ACTION
REMARKS
c. Inspection (Contd)
14.
Eight valve stem guides (18)
a. Inspect for chips, cracks, burrs,
Replace if damaged (refer to step
broken-out sections, and extensive
14d for replacement).
wear.
b. Measure protrusion.
Use suitable micrometer. Replace
if not within 1.270-1.280 in.
(3.226-3.251 cm). (Refer to step
14d for replacement.)
c. Set small bore gauge to
Replace if gauge goes into bore or
0.4552 in. (11.562 mm) and
if bore is more than wear limit
attempt to insert it in bore of
shown below. (Refer to step 14d
valve stem guide.
for replacement.)
Wear Limit ................................................................. 0.4550 in. (11.557 mm)
New Minimum ............................................................. 0.4525 in. (11.494 mm)
New Maximum ............................................................ 0.4532 in. (11.511 mm)
d. Replace valve stem guide (18)
Do not replace unless damaged
as follows:
or not within wear limits.
(1) Drive out valve stem guide
Use suitable step punch. Discard
(18) from underside of cylinder
valve stem guide.
head (9).
(2) Install new valve stem guide
Use valve guide driver (3375282)
(18).
(34). Ensure height of valve stem
guide is between 1.270-1.280 in.
(3.226-3.251 cm) after installation.
(3) Using new valve (13) or (14),
If valve does not move freely in
check bore of new valve stem
valve stem guide (18), ream valve
guide.
stem guide (18) from bottom side
of cylinder head (9) to specifica-
tions shown in step 14c.
15.
Four intake valve inserts
a. Check for looseness by
(12) and four exhaust valve
carefully striking cylinder head
inserts (15)
(9) with wood block or rubber
hammer.
b. Measure valve seat area
Perform step 15d only if width is
width (A or B in illustration).
less than 0.0625 in. (1.5875 mm)
or more than 0.125 in. (3.175 mm)
at any point.
c. Check valve seat for
Total run out should not
concentricity with valve stem
exceed 0.002 in. (0.051 mm).
guide (18).
d. Replace valve insert (12) or
(15) as follows:
(1) Clean area around valve seat.
(2) Place valve seat extractor (35)
Use valve seat extractor (ST-1279)
into valve seat and expand until
(35). Ensure extractor (35) is not
jaws are under valve insert (12).
canted.
(3) Remove valve insert (12) or
Use suitable slide hammer.
(15) from cylinder head (9).
Discard valve insert (12) or (15).
(4) Drive new valve insert (12) or
Use valve seat insert staking
(15) in valve seat insert counter-
tool (ST-1124) (36).
bore of cylinder head (9) until
fully seated.
3-120
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