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 TM 55-1905-223-24-5
a.
Loosen hose clamps (12 and 17, FIGURE 2-25) and remove two nonmetallic hoses (16) and heater tube
(14) with hose clamps (12, 13, 15, and 17) attached.
b.
Loosen hose clamps (13 and 15) and remove two nonmetallic hoses (16) from heater tube (14).
c.
Remove pipe to hose straight adapter (18) from engine coolant heater (21).
d.
Remove capscrew (8), lockwasher (9), and loop clamp (10) from heater tube (27).
e.
Loosen hose clamps (24 and 30) and remove two nonmetallic hoses (29 and 25) with hose clamps (30,
28, 26 and 24), nonmetallic hoses (25 and 29) and heater tube (27) attached.
f.
Loosen hose clamps (28 and 26) and remove nonmetallic hoses (25 and 29).
g.
Remove pipe to hose straight adapter (23) from engine coolant heater (21).
h.
Disconnect and tag electrical wiring to the pressure switch (4).
i.
Disconnect and remove nonmetallic hose assembly (7) from tube to hose elbows (2 and 11).
j.
Remove tube to hose elbow (2) and pipe to tube straight adapter (3) from pressure switch (4).
k.
Remove tube to hose elbow adapter (11).
1.
Remove two capscrews (6) and lockwashers (5) and remove pressure switch (4).
m.
Remove six capscrews (19) and plain washers (20) securing coolant heater to engine heater bracket
(22) and remove engine coolant heater. Electrical boxes are removed with the engine coolant heater
(see FIGURE 2-26).
REPAIR
Repair of the coolant heater group consists of replacing the engine coolant heater (21), nonmetallic hoses (29,
25 and 26), pressure switch (4) and nonmetallic hose assembly (7).
REPLACEMENT
a.
Install engine coolant heater (21, FIGURE 2-25) on engine coolant heater bracket (22) and secure with
six capscrews (19) and plain washers (20).
b.
Install pressure switch (4) and secure with two capscrews (6) and lockwashers (5).
c.
Install tube to hose elbow adapter (11).
2-100
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