Engine Lubrication - Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual

ENGINE MECHANICAL (H25 ENGINE) 6A2-3

Engine Lubrication

The oil pump is of a trochoid type, and mounted under the crankshaft. Oil is drawn up through the oil pump
strainer and passed through the pump to the oil filter. The filtered oil flows into 3 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 intersecting passages drilled in the crankshaft, and then injected from
the big end of connecting rod to lubricate piston, rings, and cylinder wall.
In other paths oil goes up to the cylinder heads and lubricates valves and camshafts, etc., after passing through
the internal oilway of camshafts.
An oil relief valve is provided on the oil pump. This valve starts relieving oil pressure when the pressure exceeds
2
about 430 kPa (4.3 kg/cm , 61.1 psi).