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 TM 55-1905-223-24-3
2-36. Replace/Repair Coolant Heater Group.
This task covers:
a. Removal,
b.
Repair,
c.
Replacement
INITIAL SETUP:
Tools
Equipment Condition
Tool kit, general mechanic's rail
Engine shut down and cooled below
and marine diesel engines,
120 (50 ). TM 55-1905-223-10.
F
C
Cooling system drained (Table 2-1,
DCA test kit P/N 3300846S
Item 24).
Air supply secured (port).
Battery banks disconnected (starboard).
Materials/Parts
Coolant, Item 8, Appendix C
Coolant engine heater P/N 212024
Preformed hoses P/N 3000270
Nonmetallic hose assembly P/N AS0403000SS
Nonmetallic hoses P/N 155789
Pressure switch P/N 196074
REMOVAL
WARNING
Turn OFF and tag the electrical power switch to the engine
coolant heater.
a. Loosen hose clamps (15 and 17, Figure 2-19) and disconnect nonmetallic hoses (18 and 23) from
straight pipe-to-hose adapter (19) and engine.
b. Remove nonmetallic hoses (18 and 23) and heater tube (16).
c.
Loosen hose clamps (2) and disconnect preformed hose (32) from water transfer tube (1).
d. Loosen hose clamps (30) and disconnect preformed hose (31) from pipe-to-tube elbow (29).
e. Remove preformed hoses (31 and 32) with bent metallic tube (3).
f.
Remove hexagon capscrew (5), lockwasher (4), and remove loop camp (14) from nonmetallic hose
l
assembly (6).
2-97
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