The oil pump for pressure-feeding lubrication oil to the running parts of the engine is of an internal gear type, in
which an outer ring-like gear is internally meshed with an inner gear, there being a separating crescent-like stator
between the two. The pump is mounted on the front end of the engine, and is driven by the crankshaft.
The oil pump lifts oil through the strainer and discharges it under pressure, forcing the oil through the oil filter. The
filtered oil flows into two paths inside the cylinder block. In one path, oil reaches the crankshaft journal bearings
and big-end bearings on crankpins. Some of this oil goes to the connecting-rod small ends and lubricates piston
pins there and also the walls of cylinder bores.
In the other path, oil goes up to the cylinder head and enters the oil gallery of rocker arm shafts to lubricate the
sliding parts of these shafts and also journals of the camshaft.
An oil relief valve is provided on the oil pump. This valve starts relieving oil pressure when the pressure comes
over about 3.3 kg / cm
2
(46.9 psi, 330 kPa). Relieved oil flows back to the oil pan.
ENGINE MECHANICAL (F8D ENGINE)
6A1-3
ENGINE LUBRICATION
