2) Engine Lubrication
The oil pump is of a trochoid type, and mounted on the crankshaft at the crankshaft pulley side.
Oil is drawn up through the oil pump strainer and passed through the pump to the oil filter.
The filtered oil flows into two paths in cylinder block.
In one path, oil reaches the crankshaft journal bearings.
Oil from the crankshaft journal bearings is supplied to the connecting rod bearings by means of intersect-
ing passages drilled in the crankshaft, and then injected from a small hole provided on the big end of
connecting rod to lubricate piston, rings, and cylinder wall.
In another path, oil goes up to the cylinder head and lubricates rocker arms, valves and camshaft, etc.,
after passing through the internal oilway of rocker arm shafts.
An oil relief valve is provided on the oil pump. This valve starts relieving oil pressure when the pressure
comes over about 3.0
kg/cm2
(42.7 psi, 300
kPa).
Relieved oil drains back to the oil pan.
Fig.
3-
1-2
3-3
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