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 TM 55-1905-223-24-3
REPAIR
Repair of the coolant heater group consists of replacing preformed hoses (31 and 32), nonmetallic hoses (18
and 23), nonmetallic hose assembly (6), pressure switch (9), and engine coolant heater (28).
REPLACEMENT
a. Install straight pipe-to-hose adapter (19) and pipe-to-hose elbow (29) on engine coolant heater (28).
b. Position engine coolant heater (28) onangle bracket (27) and secure with four plain hexagon nuts (20),
lockwashers (21), and hexagon head capscrews (22).
c.
Install pressure switch (9) on angle bracket (27) and secure with plain hexagon nuts (12), lockwashers
(11), and hexagon head capscrews (10).
d. Connect electrical wiring to pressure switch (9). Remove tags.
e. Install straight pipe-to-hose adapter (8) on pressure switch (9).
f.
Install pipe-to-tube elbow (7) and tube-to-hose elbow (13).
g. Connect nonmetallic hose assembly (6) to pipe-to-tube elbow (7) and tube-to-hose elbow (13).
h. Install loop clamp (14) and secure with lockwasher (4) and hexagon capscrew (5).
i.
Install preformed hoses (31 and 32) on bent metallic tube (3) with hose clamps (2 and 30).
j.
Connect preformed hose (31) to pipe-to-tube elbow (29) and secure with hose clamp (30).
k.
Install nonmetallic hoses (18 and 23) on heater tube (16) and secure with hose clamps (15 and 17).
l.
Install nonmetallic hose (18) on straight pipe-to-hose adapter (19) and secure with ose clamp (17).
h
m. Install nonmetallic hose (23) on engine and secure with hose clamp (15).
NOTE
Refill the engine with coolant with bent metallic tube (3) disconnected until heater tube (16) is full of
coolant. This will eliminate airlocks in the heater and hoses.
If coolant is added between drain intervals, additional coolant additive (DCA or equivalent) could
be required.
2-100
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