Specifications

1-18
GROUP 1-ENGINES AND EXHAUST SYSTEMS
Feeler Gauge
A1026-A
FIG. 31— Outer Race to Housing
Clearance
piston fit, thoroughly wash the cyl-
inder walls with solvent to remove
all abrasive particles, then
thoroughly dry the walls. Check the
piston fit. Mark the pistons to corre-
spond to the cylinders in which they
are to be installed. When the refinish-
ing of all cylinders that require it has
been completed and all pistons fitted,
thoroughly clean the entire block to
remove all particles from the bear-
ing bores, oil passages, cylinder
head bolt holes, etc. Coat the cyl-
inder walls with oil.
OIL PAN AND OIL PUMPS
OIL PAN
Scrape any dirt or metal particles
from the inside of the pan. Scrape
all old gasket material from the gas-
ket surface. Wash the pan in a sol-
vent and dry it thoroughly. Be sure
all foreign matter is removed from
below the baffle plate.
Check the pan for cracks, holes,
damaged drain plug threads, a loose
baffle, and a nicked or damaged gas-
ket surface.
Repair any damage, or replace
the pan if repairs cannot be made.
OIL PUMPS
Cleaning. Wash all parts in a sol-
vent and dry them thoroughly. Use
a brush to clean the inside of the
pump housing and the pressure relief
valve chamber. Be sure all dirt and
chips are removed.
Inspection. 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 hous-
ing clearance (Fig. 31).
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. 32).
The outer race, shaft and rotor are
replaceable 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 valve spring ten-
sion. If the spring tension is not
within specifications and/or the
spring is defective, replace the
spring.
Check the relief valve piston for
scores and free operation in the bore.
CRANKCASE VENTILATION
SYSTEM MAINTENANCE
Refer to Group 14 for the correct
mileage interval for maintenance.
BREATHER CAP
The breather cap located on the
oil filler tube should be cleaned with
a solvent at the proper mileage in-
terval.
Straight Edge
Feeler Gauge
FIG. 32-Rotor End Play
POSITIVE CRANKCASE VENTILATION
SYSTEM
At the recommended interval, re-
move the crankcase ventilation regu-
lator valve, intake manifold fitting,
exhaust tube, connections, and outlet
adapter. Clean the valve, exhaust
tube, intake manifold fitting, and out-
let adapter in clean carburetor sol-
vent and dry them with compressed
air. Clean the rubber hose connec-
tions with a low volatility petroleum
base solvent and dry them with com-
pressed air.
VENT TUBE-TYPE CRANKCASE
VENTILATION SYSTEM
The road draft 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 sludge and cleaned out if
necessary. In addition, on the 352
and 390 V-8 engines, the maze screen
in the intake manifold baffle plate
should be cleaned in solvent to re-
move any accumulation of sludge
deposits.