TM 5-3810-307-24-1-2
MAINTENANCE
Engine Coolant Heater. (Refer to Figure J-19.)
NOTE
Also refer to Figure J-13, Coolant Heater Installation.
Removal.
a.
Ensure battery disconnect switch is in the OFF position.
b.
Drain engine coolant from diesel engine in accordance with the Technical Manual, TM 5-
3810-307-24-1-1.
c.
Remove two bolts (1, Figure J-19) and remove cover (2) from boxed enclosure (3) of the
coolant heater (4).
d.
Loosen hose clamps then tag and disconnect coolant hoses from COOLANT IN and
OUT fittings (5) on boxed enclosure (3) of coolant heater (4).
e.
Remove screw (9), washer (10), and nut (11) from 5A in-line fuse holder (12).
f.
Disconnect control unit (internal) harness connector from control unit on coolant heater
(4).
g.
Slide wiring harness (15) and grommet (16) out of boxed enclosure (3).
h.
Loosen No. 6 clamp (17) and disconnect 2mm plastic fuel line (18) from 3.5mm fuel
hose (19).
i.
Pull 2mm plastic fuel line (18) through grommet (21) and remove from boxed enclosure
(3).
j.
Loosen clamp (22) and disconnect flexible exhaust hose (23) from coolant heater (4).
k.
Remove four hex nuts (30), spring washers (31), threaded washers (32), fender washers
(33), and shock mounts (34) from four mounting bolts (37) and remove boxed enclosure
and engine coolant heater (3 and 4).
Installation.
a.
While feeding flexible exhaust hose (23, Figure J-19) and clamp (22) through the silicon
exhaust seal (24), install boxed enclosure and coolant heater (3 and 4) on left front
fender and install shock mounts (34), fender washers (33), and threaded washers (32)
on four mounting bolts (37). Secure with four spring washers (31) and hex nuts (30).
b.
Connect flexible exhaust hose (23) and tighten clamp (22).
c.
Feed 2mm plastic fuel line (18) through grommet (21) in side of boxed enclosure (3).
d.
Connect 2mm plastic fuel line (18) to 3.5mm fuel hose (19) and secure with No. 6 clamp
(17).
J-44 Change-1