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DESCRIPTION AND OPERATION
Lubrication System
A gear-type pump at the rear of the engine,
driven by the crankshaft gear, draws lubricant
from the oil pan and supplies the system. Oil
flows from the pump through the distribution
housing to the filters, to a gallery at the right side
of the engine serving the crankshaft journals, to a
gallery at the left side serving piston lubrication
and cooling, to the cylinder head and rocker shaft
duct (valve rocker and camshaft) and back to the
oil pan.
Two full-flow filters and a by-pass filter maintain
clean lubricant. A sensor in the oil pan monitors
fluid level. There is an oil cooler immersed in
engine coolant inside the cooling duct cover.
OIL PUMP
20
Figure 20 — Oil Pump and Supply Components
The oil pump assembly includes an aluminum
pump housing and an oil distribution housing.
The distribution housing is mounted on the
cylinder block at bottom center and contains the
system pressure relief valve. A tube connects the
pump to the distribution housing. In the
distribution housing, flow is divided sending
lubricant to the piston cooling circuit and the
crankshaft gallery. From the crankshaft gallery, it
flows through the rest of the engine circuitry.
A strainer and pickup tube lead the lubricant into
the pump. For the axle forward oil pan, the
strainer is mounted on a short tube held in place
by a bracket attached to the distribution housing.
For the axle back model, a long tube without the
bracket is supplied.
1. Oil Passage
2. Rocker Arm Shaft
3. Piston Cooling Passage
4. Crankshaft Passage
5. Full-Flow Filters
6. By-Pass Filter
7. Oil Pump
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