ARMY TM 9-6115-604-12
NAVY NAVFAC P-8-633-12
(2) Replace.
(a) Remove right and left hand fan shrouds (1 and 2) by removing hexagon head capscrews (3),
lockwashers (5), and hexagonal nuts (4).
(b) Remove center grill (7) and top and bottom grills (6) by removing hexagon head capscrews (3),
lockwashers (5), and hexagonal nuts (4).
(3) Install.
(a) Install new top and bottom grills (6) and center grills (7) and secure with hexagon head capscrews (3),
lockwashers (5), and hexagonal nuts (4).
(b) Install left and right hand fan shrouds (1 and 2) and secure with hexagon head capscrews (3),
lockwashers (5), and hexagonal nuts (4).
j.
Inspect Thermostat Sensing Unit S105 and S106. The engine preheat assembly Is mounted to the skid base
under the engine Inspect the thermostats S105 and S106 (see figure 3-18) for loose mountings, loose electrical
connections, and signs of overheating or leakage.
k.
Inspect Electrical Coolant Heaters H 101 and H102. Inspect electrical coolant heaters H101 and H102 (Figure 3-
17) for loose mountings, loose electrical connections, signs of overheating, and leakage.
I.
Maintenance of Preheat Shutoff Valves.
(1) Inspect See Figure 1-5 and Figure 3-18. Inspect the preheat shutoff valves for secure mounting, signs of
leakage, and damage Turn valve handles to check for looseness and proper valve operation.
(2) Replace. Replace damaged preheat shutoff valve (Figure 1-5 and Figure 3-18) as follows:
(a) Drain the coolant supply (In accordance with paragraph 3-13 b, above), into a suitable container for
reuse.
(b) With wrench, remove damaged preheat shutoff valve (Figure 1-5 and Figure 3-18) from fittings, pipe
adapters, nipples, and elbows. Note position of valve prior to removing and return to its original position.
(c) Apply a uniform coat of sealing compound, MIL-S-15204C, on threads of replacement preheat shutoff
valve. With wrench, install replacement valve on the appropriate fittings. Position preheat shutoff valve
with the handle side upwards. When tightening valve to pipe, apply wrench to valve end nearest the
pipe being worked. Make certain that the body cap end of the valve does not turn out of the valve body.
Return valve to original position.
(d) With new preheat shutoff valve installed, replace the coolant supply through the radiator as outlined in
step b, above.
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