Basic Engine
1. Remove the oil inlet tube from the oil pump and
remove the gasket.
2. Remove the cover attaching screws and remove the
cover. Remove the inner rotor and shaft assembly.
and remove the outer race
3. Drill a small hole. then insert a self-threading sheet
metal screw of the proper diameter into the oil
pressure relief valve chamber cap and pull the clip
out of the chamber Remove the spring and plunger.
Assembly
The oil pump assembly is shown in Figure 65.
1. Clean, inspect and oil all parts thoroughly.
2. Install the oil pressure relief valve plunger. spring
and a new cap.
3. Install the outer race and the inner rotor and shaft
assembly. Be sure the identification mark on the
rotor is on the same side as the identification mark on
the outer race. The inner rotor and shaft, and the
outer race are serviced as an assemble. One part
should not he replaced without replacing the other.
Install the cover and torque the attaching screws to
specification
4. Position a new gasket and the oil inlet tube on the oil
pump and install the attaching bolts
5. Prime the oil pump by filling the inlet port with oil
Rotate the pump shaft until oil flow(is from the outlet
port.
CYLINDER ASSEMBLY
Disassembly
1. Mount the old engine in a work stand and remove all
parts not furnished with the new cylinder assembly,
FIG. 64 Typical Piston, Connecting Rod and Related Parts
following the procedures given under Removal and
Installation.
2. Remove the old cylinder assembly from the work
stand.
Assembly
1. Clean the gasket and seal surfaces of all serviceable
parts and assemblies.
2. Position the new cylinder assembly in a work stand
and transfer all serviceable parts removed from the
old cylinder assembly. following the procedures
given under Removal and Installation.
3. Check all assembly clearances and correct as
necessary.
CYLINDER BLOCK
Before replacing a cylinder block. determine if it is
repairable. If so, make the necessary repairs
Disassembly
1. Mount in a work stand and completely disassemble
the old engine. following the procedures given under
Removal and Installation
FIG. 66 Oil Pump - Disassembled
2. Remember to ridge-ream the cylinder bores before
5. Check the ring side clearance of the compression rings with
removing piston assemblies.
a feeler gauge inserted between the ring and the lower land.
Assembly
The gauge should slide freely around the entire ring
1. Clean the gasket and seal surfaces of all serviceable
circumference without binding. Any wear that occurs will form
parts and assemblies.
a step at the inner portion of the lower land. If the lower
2. Position the new cylinder block in the work stand and
lands have high steps, the piston should be replaced.
transfer all serviceable parts removed from the old
6. Be sure the bearing inserts and the bearing bore in the
cylinder block, following the instructions given under
connecting rod and cap are clean. Foreign material under the
Removal and Installation.
inserts will distort the bearing and cause a failure. Install the
3. Check all assembly clearances and correct as
bearing inserts in the connecting rod and cap with the tangs
necessary.
fitting in the slots provided.
OIL PUMP
Disassembly
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