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 TM 55-1905-220-14-11
5-78. LUBE OIL PUMP - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
INSPECTION (Cont.)
c.
Inspect the bushings in the pump
body and cover. If the bushings
are worn excessively, replace the
pump and cover assemblies unless
suitable boring equipment is avail-
able for finishing the new bushings.
When installing the new bushings,
replace all of the bushings. The
bushings must be located and posi-
tioned as shown. Also, the gear
bore and the bushing bore in both
the pump body and the cover must
be concentric within .001 inch.
The shaft-to-pump body and the
bushing clearance with new parts
is .0008 inch to .0025 inch.
The shaft-to-pump cover bushing
clearance with new parts is .0010
inch to .0027 inch.
d. In an efficient oil pump, the gears
should have a free-running fit
(with no perceptible looseness) in
the pump housing. If the gear teeth
are worn, install new gears. The
use of excessively worn gears will
result in low engine oil pressure
which in turn, may lead to serious
damage throughout the engine.
e. Inspect the pressure relief valve
and its seat in the pump body. If
necessary, install new parts.
5-1064
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