TM 5-3805-263-14&P-3
SYMPTOMS
CAUSE
REMEDY
B. Restricted oil return
B.
Oil return to the engine should not be in
(to engine)
any way restricted. Check for excessive
bends, kinks, and restrictions in the oil
return line. Minimum recommended oil
return line size is 5/8" O.D. tubing or
equivalent I.D. (1/2" minimum). Return line
must CONSTANTLY DESCEND from the
compressor to the engine crankcase. Make
certain oil drain passages in the compressor
and mating engine surfaces are
unobstructed and aligned. Special care
must be taken when sealants are used with,
or instead of, gaskets.
C. Poorly filtered inlet air
C.
Check for damaged, defective or dirty air
filter on engine or compressor. Check for
leaking, damaged or defective compressor
air intake components (i.e., induction line,
fittings, gaskets, filter bodies, etc.). The
compressor intake should not be connected
to any part of the exhaust gas recirculation
(E.G.R.) system on the engine.
D. Insufficient compressor
D.
For air-cooled portions of the compressor:
(compressor runs hot)
1. Remove accumulated grease, grime, or
dirt from the cooling fins. Replace
components found damaged.
2. Check for damaged cooling fins. Replace
components found damaged.
3. Air-cooled compressors should not be
used on engines equipped with fan
For water-cooled portions of the com-
pressor:
1. Check for proper coolant line sizes.
Minimum recommended size is 1/2"
O.D. tubing.
2. Check the coolant flow through the
compressor. Minimum allowable flow is
2.5 gallons per minute at engine
governed speed. If low coolant flow is
detected, inspect the coolant lines and
fittings for accumulated rust scale, kinks
and restrictions.
3. Water temperature should not exceed
200 o F.
4. Optimum cooling is achieved when
engine coolant flows into the com-
presser cylinder block at one end and
out the compressor cylinder head at the
opposite end.
E.
Check reservoir drain valves to insure that
E. Contaminants not being
they are functioning properly. It is recom-
regularly drained from
mended that the vehicle should be equipped
system reservoirs
with functioning automatic drain valves, or
have all reservoirs drained to zero (0) psi
daily, or optimally to be equipped with a
desiccant-type air dryer prior to the reservoir
system.
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