TM-9-2320-273-34

TRUCK TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

DECEMBER 1980
TM-9-2320-273-34

  TM-9-2320-273-34 - Page 763 of 801

TM9-2320-273-34
23-7. New Installation of Engine Coolant Heater.
a.
Drain engine coolant (Refer to TM 9-2320-273-20).
b.
Remove engine air cleaner and ducts (Refer to TM 9-2320-273-20).
Install heater assembly (2, fig. 23-4) to right hand frame rail, using single frame bracket (3)
for M915 or double frame bracket (4) for M916 thru M920. Mount to frame using two bolts, lock-
washers, and nuts (8). Position forward edge of bracket exactly 7.0 inches behind the centerline of
existing .750 inch diameter frame hole. See view A.
d.
Remove four clamps (28), two hoses (27) and water pipe (26) for access to block mounted
pipe plug (25); remove plug (25). See view B.
Using pipe sealant on all threads, screw elbow (29) into block port where pipe plug (25) was
remo~ed. To elbow (29), screw in one adapter (31). See view B.
f.
Using pipe sealant on all threads, install adapter (10), tee fitting (12), draincock (11), elbow
(13), elbow (14) and hose adapter (16) as shown in view A.
9.
Install return hose (32) to adapters (31) and (16) with two hose clamps (33). See views A
and B.
h.
Replace water pipe (28), two hoses (27), and four clamps (26). See view B.
i.
Inspect rear water manifold section at location (1 7). If a 1/2 inch NPT pipe plug is found,
remove plug. If no plug is found, do the following:
(l) Remove rear manifold section. (Refer to TM 9-2320-273-20.)
(2) Drill and tap a 1/2 inch NPT.
/3) Remove all metal shavings and reinstall on engineJRefer to TM 9-2320-273-20.)
i
Using pipe sealant on all threads, install adapter (18), tee fitting (19), draincock (20), and
adapter (21 ). See view B.
k.
Using pipe sealant, install adapter (1) to top rear port of heater. See view A.
/.
Connect two hoses (23) and (34), with output tube (24) and adapters (21 ) and (1) using
two hose clamps (22) and two hose clamps (35). See views A and B.
m.
Secure wire assembly (7) to top of bracket (3) or (4) with clamp (6) and nut (5). A second
clamp (6) should be installed to the inside rear of the fender to secure the wire assembly. Attachment
to the fender is accomplished by drilling one .312 diameter clamp mounting hole and securing with one
.25-20 hex nut. See view A.
n.
Route wire assembly (7) to circuit breaker box and connect.(Refer to figure 23-1.)
o.
Close draincock (11, fig. 23-4) and open valve (30). See views A and B.
P.
Refill engine coolant.(Refer to TM 9-2320-273-20.)
9.
Open draincock (20, fig. 23-4) to allow any trapped air to escape, then close. See view B.
r.
Replace engine air cleaner and ducts. (Refer to TM 9-2320-273 -20.)
s.
Stati engine (Refer to TM 9-2320-273-10) and check for leaks. Tighten any loose connections,
re-check, and shut down engine.
23-8


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