Advertisement
8-20
Check the inside of the pump
housing and the outer race and rotor
for damage or excessive wear.
Check the mating surface of the
pump cover for
wear.
If the cover
mating surface is worn, scored or
grooved, replace the
cover.
Measure the outer race to housing
clearance
(Fig.
33)
which should be
to specifications.
With the rotor assembly installed
in the housing so that the identi-
fication mark on the outer race is
toward the bottom of the pump,
place a straight edge over the rotor
assembly and the housing. Measure
the clearance (rotor end play) be-
tween the straight edge and the rotor
and outer race (Fig.
34).
1be outer race, abaft and rotor are
replaceable only
a
an assembly.
Check the drive shaft to housing
bearing clearance by measuring the
OD of the shaft and the ID of the
housing bearing.
Check the rotor tip clearance as
shown in Fig. 35.
Inspect the relief valve spring for
a
collapsed
or worn
condition.
Check the relief valve spring ten-
GROUP 8-ENGINE
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
bore.
POSITIVE CRANKCASE
VENTILATION SYSTEM
Refer to Group 19 for the correct
mileage interval for maintenance.
CLEANING
Do not attempt to clean the crank-
case ventilation regulator valve.
It
should be replaced at the specified
mileage intervals (Group 19).
The oil filler tube breather cap,
located on the valve rocker arm
cover should be cleaned at the
specified interval. Remove the cap
and wash it in a low-volatilty, petro-
leum-base solvent. Probe the brea-
ther hole(s) to assure r,.moval of
any accumulated deposits. Shake the
cap dry and install it.
Do
not
dry
with compressed air as air pressure
may damage the filter element.
Clean the crankcase ventilauon
system connection on the carbu-
retor spacer by probing the inlet
nipple with a flexible wire or bottle
brush.
Clean the rubber hoses with a
low-volatility,
petroleum-base sol-
vent and dry with compressed air.
FIG. 34
-Rotor
End Play
FIG. 35
-Checking Pump Rotor
Tip Clearance
Advertisement
