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TM 9-4110-257-14
CAUTION
Cylinder head is made of soft metal. Screwdrivers or pry bars used between cylinder block and
cylinder head to loosen it can cause damage.
(10) Carefully remove two cylinder heads (23), gaskets (24), four o-rings (25), protection pipes (26), rods (27),
and o-rings (28). Discard gaskets and o-rings.
b. Testing.
(1) Remove two cylinder heads (23) per above procedures.
(2) Invert each cylinder head (23) and pour enough diesel fuel into each cylinder head to pool around valve seats
(29).
(3) Examine each port (30) for three minutes. If fuel accumulates in a port, replace the cylinder head (23). Contact
your local environmental officer for guidance on how to properly dispose of diesel fuel in accordance with local
regulation.
(4) If no failure was indicated, install two cylinder heads (23).
(5) If a cylinder head (23) must be replaced, remove nozzle (31) (para 5-39) from it.
c. Installation.
(1) Clean carbon deposits from all mating surfaces. Check each cylinder head (23) for any cracks or other damage
that would affect operation of the engine. If damaged, cylinder head must be replaced.
(2) Install nozzle (31) if removed (para 5-39).
(3) If nozzle (31) was removed, check the distance between nozzle tip and cylinder head face (32). The distance
must be between 0.069 in. and 0.089 in. (1.75 mm and 2.25 mm). If the distance is not within this range, remove
and install the nozzle (para 5-39) adding or removing washers as necessary between nozzle and cylinder head (23).
(4) Install four o-rings (28), protection pipes (26), rods (27), and o-rings (25).
(5) Install two new gaskets (24).
(6) Install two cylinder heads (23) being careful to align them onto protection pipes (26).
(7) Install flat washer (20), and nut (19) as noted during removal. Do not tighten nut.
(8) Install seven flat washers (22) and nuts (21). Do not tighten nuts.
NOTE
Intake manifold must be installed onto the cylinder heads to align them. The manifold
mounting screws must not be tightened to the point of preventing movement/alignment of the
cylinder heads.
(9) Install two new gaskets (14), intake manifold (11), four flat washers (13) and screws (12). Only tighten screws
snugly, do not fully tighten.
5-97
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