75
Lubrication system
General
The oil pump is located around the front end of the
crankshaft, the pumps inner rotor is driven by a key
in the crankshaft. The pump has an inner and an
outer rotor which are located eccentrically in rela-
tion to each other. The inner rotor has ten teeth
which mesh with the outer rotors eleven teeth.
When the pump turns the space between the teeth,
which are meshed with each other, increases so
that a vacuum occurs, or decreases so that pres-
sure increases.
The lubricating oil from the oil pan is routed through
an oil screen and a pipe to a passage in the cylinder
block and from there on to the suction side of the
pump.
A relief valve (mounted in the pump housing) opens
if the pressure is too high. This allows a certain
amount of the oil on the output side to be returned
to the intake side of the pump.
From the pump the oil passes through a filter
mounted on the pump housing. After the filter the oil
passes into the pressure channel which is drilled
the length of the cylinder block.
From the pressure channel the oil passe to the
crankshaft main bearings and through the channels
in the crankshaft to the big ends. The pistons and
the cylinder bores are lubricated by oil mist and
splash lubrication.
Oil passes (through the channels in the block and
cylinder block) from the rear section in the cylinder
block to the pressure channel in the cylinder head.
From the pressure channel in the head the oil pass-
es to each of the camshaft bearing journals. The
valves and the valve lifters are lubricated by oil
mist and splash lubrication.
1. Oil pump
2. Relief valve
3. Oil cooler
4. Oil filter
5. Crankshaft
6. Camshaft
Summary of Contents for MD22
Page 1: ...Engine repair MD22 TMD22 TAMD22 Workshop Manual 2 0 A ...
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