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3 5 0 AND 4 0 3 ENGINE
6A4-2 1
Fig. 6A4-53 Engine Support Tool (Typical)
TAB ON GASKET MUST BE
CYL. BLOCK
PLUG NOT USED
FRONT SEAL
10
FI
LBS.
3683
Fig. 6A4-54 Oil Pan Assembly
OIL PUMP
Removal
1. Remove oil pan. (Refer to OIL PAN Removal)
2. Remove the oil pump to rear main bearing cap
attaching bolts, then remove pump and drive shaft extension.
Disassembly (Fig. 6A4-55)
1. Remove the oil pump drive shaft extension.
NOTE: Do not attempt to remove the washers from the
drive shaft extension. The drive shaft extension and
washers must be serviced as an assembly. Fig. 6A4-56
2. Remove the cotter pin, spring and the pressure
regulator valve.
NOTE: Position thumb over pressure regulator bore
before removing cotter pin, as the spring is under
pressure.
3. Remove the oil pump cover attaching screws and
remove the oil pump cover and gasket.
4. Remove the drive gear and idler gear from the pump
body.
Fig. 6A4-55 Oil Pump Exploded View
Fig. 6A4-56 Oil Pump Drive Shaft Extension
Inspection
Check the gears for scoring or other damage. If they are
damaged, new gears should be installed. During assembly, the
gear end clearance should be gauged. Proper end clearance
is .00 15" to .0085
".
Also check the pressure regulator valve,
valve spring and bore for damage. Proper valve to bore-
clearance is .0025" to .0050". The checking of gear end
clearance will be covered in "Assembly".
Assembly
1. Install the gears and shaft in the oil pump body and
check the gear end clearance by placing a straight edge over
the gears and measure the clearance between the straight edge
and the gasket surface. The clearance should be between
,0015" to .0086". If the end clearance is near the excessive
reading check for scores in the cover that would bring the
total clearance over the specified amount.
2. Install the cover screws and tighten alternately and
evenly. The torque is 8 ft. lbs.
3. Position the pressure regulator valve into the pump
cover, closed end first, then install the spring and retaining
pin.
NOTE: When assembling the drive shaft extension to
the drive shaft, THE END O F THE EXTENSION
NEAREST THE WASHERS MUST BE INSERTED
INTO THE DRIVE SHAFT.
Installation
1. Insert the drive shaft extension through the opening
in the main bearing cap and block until the shaft mates into
the distributor drive gear.
2. Position pump onto the rear main bearing cap and
install attaching bolts. Torque bolts to 35 ft. lbs. (Fig. 6A4-57)
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