1
·26
GROUP
1-
ENGINES
AND
EXHAUST
SYSTEMS
FIG.
47-0uler
Race
10
Housing
Clearance
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. 47).
With the
rotor
assembly installed
in the housing, place a straight edge
over the rotor assembly and the
housing.
Measure
the
clearance
be-
tween the straight edge and the
rotor
and outer race (Fig. 4S).
The
outer
racc,
shaft
and
rotor
are replae,cable only as
an
assembly.
Check
the drive
shaft
to housing
bearing clearance
by
measuring the
OD
of
the shaft and the
ID
of
the
housing bearing,
Inspect the relief valve spring for
a collapsed
or
worn
condition.
Check the relief va
lv
e spring ten-
sion.
If
the spring tension
is
not
within
specifications
and
l
or
the spring
is
defective, replace the spring.
Check the relief valve piston for
scores
and
free opera
ti
on in the bore.
Inspection -
Gear-
Type. Inspect
the pump body
and
the gear teeth
for damage
or
wear.
Check
the gear
FIG.
48-Rolor
End
Play
end clearance with a dial indicator
or
Plastigage.
The
Plastigage method
is
as follows:
Po
sition the gasket
on
the hous-
in
g, then place the Plastigage on the
gears and install the cover. Remove
the cover and check the reading.
Check the gears for freedom
of
rotation. Check the compression
of
the oil pressure relief valve spring
and check the clearance
of
the relief
valve in the valve chamber.
CRANKCASE VENTILATION
SYSTEM
MAINTENANCE
Refer to
Group
16 for the correct
mileage interval for maintenance.
BREATHER
CAP
The
breather cap should be cleaned
with a solvent at the proper mileage
interval.
Do
not oil the mesh screen
after cleaning.
VENT TUBE-TYPE
CRANKCASE
VENTILATION
SYSTEM
223
Six
and
292
V
·8.
The
hreather
cap, located on the oil filler tube,
should
be
cleaned with a solvent at
the
proper
mileage interval.
The
ventilation tube seldom re-
quires cleaning except during a high
mileage engine overhaul. However,
if
there
is
evidence
of
crankcase pres-
sure, the tube should be checked for
excessive slud
ge
and
cleaned out.
302
and
332
HD.
The
breather
cap located on the valve push rod
cover
of
the 302
and
332
HD
V·S
eng
in
es should be serviced as indi-
cated for the 223 Six
and
292
MD
and
HD
V·S.
The
ventilation tube on these en-
gines contains a filtering element
which
is
serviced as follows:
1. Remove the crankcase ventila-
tion tube lower extension by loosen-
ing the retainer bolt
and
turning the
tube to disengage the slot.
2. Remove
the
vent tube filter with
pliers.
Do
not
attempt
to
drive
it
out
as this
will damage the filter.
3. Clean the filter in so
lv
ent
and
dry
it with compressed air.
4. 1nstall the filter
and
crankcase
ventilation tube lower extension.
POSITIVE
CRANKCASE
VENTILATION SYSTEM
At
the recommended interval, re-
move the crankcase ventilation reg-
ulator valve, exhaust tube, and con-
nections. Clean the valve and exhaust
tube in clean
carburetor
solvent and
dry
them with compressed air. Clean
the
rubber
hose connections with a
low volatile petroleum base solve
nt
and
dry
them with compressed air.
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