TM 5-4320-300-14
6-6. OIL PUMP (CONT)
Location/item
Action
Remarks
14. Screen
Inspect seal surface for damage. Inspect screening
for tears or obstructions. Clean to remove obstruc-
tions. Replace if damaged.
15. Mounting
Inspect bolts for damaged threads. Replace if
bolts and damaged. Inspect lockwashers. Replace if damaged
lockwashers or missing.
16. Pump rotors,
Inspect the lobes and faces
body, and of pump rotors for scratches
cover plate or burrs and the surfaces of
pump body and cover plate
for scoring. Slight scratches
or score marks may be re-
moved with P-C-458 crocus
cloth.
Measure the clearance between
inner and outer rotors at each
lobe. The clearance should not be
less than 0.004 inch (0.1016 mm)
or more than 0.011 inch (0.279
mm). Measure the clearance from
the face of pump body to the
side of inner and outer rotor with
a micrometer depth gage. The
clearance should be not less than
0.001 inch (0.0254 mm) or more
than 0.0035 inch (0.0889 mm).
NOTE
Wear on pump rotors may be kept to a minimum by using clean oil. If dirt and sludge are allowed
to accumulate in the lubricating system, excessive rotor wear may occur in a comparatively short
period of time.
17. Inner rotor
Inspect for excessive wear.
and oil pump
drive gear
splines
6-20
