The lubrication system is a full-flow, filter pumping
system.
The engine oil that accumulates in the oil pan is drawn
and discharged by the oil pump. After its pressure is
regulated by the relief valve, the oil passes through
the oil filter. Then, it flows from the oil passage in the

cylinder block to the individual crankshaft journals and
the cylinder head.
After  the  oil  is  pumped  to  the  individual  crankshaft
journals,  it  passes  through  a  passage  in  the
crankshaft  and  is  fed  to  the  pins.  After  the  oil  is
pumped to the cylinder head, it flows to the camshaft
journals and the oil feeder control valves.

12-2

ENGINE LUBRICATION

GENERAL INFORMATION

OIL PASSAGE

M21200000083USA0000010000

AK602604

Oil filter

Oil pressure switch

Oil pump

Oil screen

Crankshaft

Oil feeder
control valve

AA00

Oil pressure switch

Oil control valve filter

Camshaft
right

Camshaft left

OIL PUMP

M21200000020USA0000010000

The oil pump is a trochoid type, directly driven by the
crankshaft.
On cycloid oil pump, as the inner rotor is rotated by
the crankshaft, the outer rotor also rotates. The

resultant change in spatial volumes between the
rotors generates pumping action.
Specifically, oil is sucked into the expanding space
and is pushed out from the shrinking space.

ENGINE LUBRICATION

12-3

OIL PUMP

Content .. 1235 1236 1237 1238 ..