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(137)
mating surface is worn, scored, or
grooved, replace the cover.
Measure the outer race to hous-
ing clearance (Fig. 24).
With the rotor assembly installed
in the housing, place a straight edge
over the rotor assembly and the hous-
ing. Measure the rotor end play
clearance between the straight edge
and the rotor and outer race (Fig.
25).
If the clearance between the hous-
ing and outer race and the rotor end
play are not within specifications,
replace the outer race and rotor, or
the oil pump assembly. The outer
race, shaft and rotor are replace-
able only as an assembly.
Check the drive shaft to housing
bearing clearance by measuring the
OD of the shaft and the ID of the
PART 8-1-GENERAL ENGINE SERVICE
housing bearing.
Inspect the relief valve spring for
a collapsed or worn condition.
Check the relief valve spring ten-
sion.
If
the spring tension is not with-
in specifications and/ or the spring is
defective, replace the spring.
Check the relief valve piston for
scores and free operation in the bor.e.
Check the relief valve to body clear-
ance. The relief valve should have a
snug fit and should slide freely in
the bore. Clean the valve and bore
with fine crocus cloth if a slight re-
striction is felt.
CRANKCASE VENTILATION
SYSTEM MAINTENANCE
Refer to Group 19 for the correct
mileage interval for maintenance.
8-17
CLEANING
The breather cap located on the
oil filter tube should be replaced at
the proper mileage interval. Do not
clean the breather cap.
•
At the recommended interval, re-
move the crankcase ventilation regu-
lator valve, tube, hose connections,
outlet adapter and oil separator ele-
ment. Clean the valve, element, tube
and outlet adapter in clean carbure-
tor solvent and dry them with com-
pressed air. Clean the rubber hose
connections with a low-volatility,
petroleum-base solvent and dry them
with compressed air.
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Troubleshooting
