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TM 10-3930-621-34
c. Cleaning and Inspection.
(3) Backlash between pump gears should not
(11) Clean all parts with cleaning compound,
exceed 0.020 of an inch.
solvent (Spec.
P-S-661).
Dry thoroughly with
d. Installation.
compressed air.
(1) Install pump to flange of engine block with
two bolts (1, fig. 3-13). Drive gear must be properly
Note.  The principal wearing parts of the oil
meshed with camshaft gear.
pump are the gears. If dirt or sludge have been allowed
Caution: If pump is not seated correctly, it is
to accumulate in the lubricating system, the oil pump'
possible to break the retaining lugs In the casting
gear wear may be rather pronounced in a comparatively
body when tightening bolts (1). Check pump position
short time. When the oil has been kept clean and oil
carefully before tightening.
filter has been properly serviced, the wear on these parts
(2) Install oil pan (para 3-40).
will be very slow.
(3) Check to see if drain plug (9, fig. 3-12) is
secure and add oil as specified.
(2) Both the spiral drive gear on the pump drive
shaft and the mating gear on the camshaft, should be
checked for proper contact and evidence of the
excessive wear, pitting or chipping.
3-20

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