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 TM 55-1925-204-12
(e) Fill the engine cooling system.
(d) Install the hose connection and two
o. Valve Rocker Cover.
hose clamps between water manifold and the exhaust
manifold, then tighten hose clamp screws. Fill the cooling
(1) Removal.
system.
(a) Turn
the
two
hand
nuts
n. Heat Exchanger and Oil Cooler. The oil cooler
counterclockwise to loosen.
core may be removed for inspection and cleaning without
(b) Grasp handle, then lift the valve
removing the heat exchanger housing. See instructions
rocker cover off the cylinder head. Remove the gasket.
for oil cooler maintenance (para 5-20).
(2) Installation. Install the valve rocker cover
(1) Removal.
by reversing the procedures in (1) above.
(a) Drain the engine cooling system.
(b) Drain the lubrication oil system.
5-3. Cylinder Head
(c) Remove the six capscrews and
a. General The cylinder head is a one piece casting
washers securing the oil bypass line (fig. 5-7), then
in which the exhaust valves and fuel injectors are
remove the bypass line from oil cooler and the engine.
installed. The valve and injector operating mechanism,
(d) Loosen two hose clamps and remove
and the injector fuel control mechanism are installed on
the raw water hose connection (fig. 5-6) inlet.
the cylinder head. Each cylinder has three rocker arms.
(e) Loosen hose clamps and remove the
Two for the exhaust valves, and one for the fuel injector.
water hose connection between exhaust manifold and oil
Each operating unit includes push rods, push rod seats,
cooler.
push rod springs, spring retainers, rocker arm shaft
(f) Loosen the two hose clamps and
brackets, shaft, bolts, fuel lines, and fuel control rod.
remove the hose connection between the water manifold
b. Removal. When servicing the cylinder head
and the thermostat housing of heat exchanger expansion
components during regular maintenance procedures,
tank. Repeat the above at the raw water discharge on
remove only those accessories required for access to the
port side of heat exchanger.
cylinder head, and drain the cooling system to a level
(g) Loosen the two hose clamps securing
below the item to be removed.
the suction water line hose connection to the fresh water
(1) Accessories.
pump under the governor mounting bracket, and remove
(a) Drain the cooling system as required.
the hose connection.
(b) Remove the required accessories
(h) Remove the four capscrews and
lockwashers from the bosses on rear of expansion tank
(c) Disconnect the water manifold from
the heat exchanger expansion tank (at the thermostat
exchanger to the engine block cover, then lift heat
housing).
exchanger away from the engine.
(d) Disconnect the throttle control rod at
NOTE
the governor.
Disassembly and repair of the heat
(e) Disconnect the governor fuel rod from
exchanger is covered in paragraph 5-20
the injector control tube lever.
(2) Installation. When the heat exchanger has
(f) Remove
governor
cover
and
been cleaned, repaired, and reassembled it is ready for
subcover (para 5-2.g.).
installation as follows:
(g) Disconnect fuel drain line from the
(a) Lift the assembled heat exchanger
cylinder head.
into position at front of the engine, install the four washers
(h) Remove the injector control shaft (fig.
and capscrews through engine front cover into bosses on
the heat exchanger housing. Tighten to a torque of
CAUTION
between 25-30 ft lbs.
Immediately after removing fuel lines
(b) Install hose connections and clamps
from the injectors and fuel manifold,
to all inlet and outlet water lines, including the raw water
cover
all
openings
to
prevent
discharge line, by reversing the procedures in step (1), (
contamination of the fuel system, or
(d) through (g) ) above.
damage to fittings .
(c) Install the oil bypass line by reversing
the procedure in (1), (c) above.
(d) Fill the engine lubrication system (LO
55-1925-204-12-5).
5-14
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