Volvo Penta D2-55, Руководство по ремонту

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Design and function
Lubrication system, general
The engine has a pressurized lubrication system with
full-flow oil filter.
Oil pump
The lubrication pump is located within the idler gear on
the timing gears, from where it is also driven.
The pump is a rotor pump, with an inner rotor and an
outer rotor, eccentrically mounted in relation to each
other. The inner rotor has one “tooth” less than the
outer rotor.
The function of the pump is that the volume of the
spaces between the inner and outer gears increases
and decreases. During the first section of the rotation
of the inner rotor, the volume increases, a partial vac-
uum occurs and oil is sucked into the inlet. After
about a half rotation, the volume is reduced and a
pressure occurs, which forces the oil out through the
outlet.