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TM 9-2815-213-34
NOTE
If nylok capscrew breakaway torque is
less than 15 inch pounds, replace
capscrews.
Figure 3-29. Valve seat-sectional view.
(a) Install injector sleeve holder (15, fig. B-28) on a
scrap injector and cup assembly into each injector
sleeve. Tighten sleeve holders to 10/12 foot-pounds
torque or injector capscrews to 30/35 foot-pounds torque
as shown in figure 3-30.
(b) Using  water  heated  to  175/200  degrees
Figure 3-31. Injector tip protrusion measurement.
Fahrenheit, test cylinder head for leaks at 35/85 pounds
pressure.
d.
Valves.
(c) Check carefully around injector for any evidence
(1) Inspect valve heads for pitted, cupped,
of water leaks. Mark sleeves for replacement that
cracked, or excessively worn condition. Check valve
evidence leakage. If cylinder head shows leakage,
head rim thickness (fig. 3-32) and replace valve if less
replace head.
than 1/16 inch.
(d) Open water outlet valve to check for free water
(2) Inspect valve stems for scored, cracked or
circulation through cylinder head.
excessively worn condition. If stems are worn beyond
(2) Inspect injector sleeves for scratches on cup
0.4490 inch replace valve.
seat area and for continuous contact by using Prussian
(3) Inspect collet recesses (fig. 3-32) for
Blue. Mark sleeve that is scratched on does not show
serviceability.
continuous seat contact, of at least 0.060 inch wide, for
f.  Crosshead Giudes (fig. 3-33).
replacement.
(1) Check crosshead guides with a square. They
(3) Check injector tip protrusion by installing
must be perpendicular at four right angles with the
injector assembly and torquing to 30/35 footpounds. If
cylinder head.
injector protrusion exceeds 0.125 inch mark sleeve for
(2) Measure outside diameter of crosshead
replacement (fig. 3-31).
guides using a micrometer. Guides must measure
0.4322 inch minimum. Discard if worn beyond that limit.
(3) Measure crosshead protrusion above block to
2.090/2.110 inches. Discard guides not within these
tolerances.
g. Valve Guides (fig. 3-34).
(1) Adjust a small bore gage with a micrometer
at 0.0002 inch above worn limit, and use as "No-Go"
gage.
(2) Mieasure the hole at several points crosswise
and endwise of the head.
(3) Mark valve guide for replacement if worn
larger than 0.4545 inch inside diameter.
(4) Inspect sharp edge of guides for chips,
cracks and burrs. If damaged, mark for replacement.
Figure 3-30. Injector sleeve holder installation.
3-17

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