TM-5-4310-389-14
3-33 COOLING AIR DUCTING SYSTEM (ENGINE).
DESCRIPTION
This task covers:
Service
Inspect
Repair
INITIAL SETUP
Tools:
Equipment conditions:
General Mechanic Tool Kit
Engine secured (paragraph 2-11)
Materials/parts:
Wiping rags, item 25 Appendix E
Face shield, item 26 Appendix E
Detergent, item 12 Appendix E
INSPECT SERVICE
CAUTION
Never clean the engine while it is running.
a. Cleaning the cooling system is most important since accumulation of dust on the cooling air blower blading (1),
on the cooling fins of the cylinder heads (2), cylinders (3, figure 3-32), or oil cooler (see paragraph 3-25) is liable
to substantially reduce cooling efficiency, especially where the dust is retained by a film of fuel or oil.
b. Regularly check the cooling system for contamination; clean, if necessary. Please note that the inspection
intervals of every 500 hours can only be given as guide figures based on normal operating conditions, and that in
the case of abnormally contaminated cooling air (check mounted cooling air sieve boxes for correct seating and
good condition) the inspection and cleaning intervals may have to be shortened accordingly.
c. For inspecting and cleaning, proceed by removing hex bolt (1, figure 3-33) securing air cowling hood (2) on the
alternator side, and removing the hood. Then on exhaust side, detach baffle by removing two hex bolts. Inspect
gasket; replace, if required. If further inspection is required on the exhaust side, remove the oil bath air cleaner
assembly by removing two bolts. Inspect gasket; replace, if required. Remove four bolts (1, figure 3-34), lock
washers, and washers that secure the exhaust side deflection cover (2) in place. Place deflection cover and
tighten bolts, lock washers, and washers. Replace the oil bath air cleaner assembly. Tighten bolts.
3-59
