Figure 4-3. Primary Radio Suppression Components (Sheet 2 of 2)
Section VIII. MAINTENANCE OF ENGINE COOLING SYSTEM
4 - 1 6 . DESCRIPTION AND FUNCTION.
The engine has a pressure air cooling system. Fins
on the engine blower draw air into the front of tbe en-
gine housing and force it past the cylinders and out
the right side of the engine. The engine air outlet
uses a shutter assembly to control engine temper-
ature. Part of the air is directed thru the air cleaner
4-17. ENGINE COOLING ASSEMBLY.
lnspection (see figure 3-14). On ASK equipped generators,
refer to para. 5-3 and 5-8 and remove ASK cover and exhaust
plenum assemblies. Check that ASK front panei assembly is clear
(1) Check shutters on shutter assembly (4) for
cleanliness and obstructions. Check blower housing
(32) externally and internally at engine blower for
cleanliness and obstructions.
at cold temperatures. A thermo power unit controls
(2) Open panel (12) by opening latches (14) and
shutter opening which limits air flow when the engine
check that panel hinge works properly. With panel
is cold When the engine air temperature reaches
open, check engine fins for cleanliness and obstruc-
approximately 120° F (49° C), the shutters begin to
tions to airflow.
open. The shutters are completely open at 140° F
(60° C). The cooling system contains a high temper-
ature cut-out switch that shuts down the engine in
can the engine temperature reaches 394°F (2010C).
(1) Disconnect negative lead from batteries.