Oil Valves; Oil Pump - Volvo Penta D1-13 Workshop Manual

1
2
P0007862
P0007856
1 Retainer ring
2 Spring washer
3 Spring
4 Shim
5 Oil pump cover
6 Inner rotor
7 Idler wheel with outer rotor
8 Thrust washer
47701798 05-2013 © AB VOLVO PENTA
20-0 Engine Information, General

Oil Valves

Lubrication oil pressure is limited by a relief valve (1).
The valve is located in the lubrication system just
before the oil filter (2). The valve opens at high pres-
sure and allows the oil to flow back into the oil pan.
The D1-13 and D1-20 engines have a relief valve that
opens in the 352-448 kPa (51–65 PSI) range. On
D1-30 and D2-40 engines, the valve opens in the
304-500 kPa (44–73 PSI) range.
A bypass valve located on the oil filter opens if resist-
ance in the filter becomes abnormally high. Oil supply
to lubrication points is thus ensured even when the fil-
ter is blocked; however, the oil is no longer cleaned.

Oil pump

The lubrication pump is located within the idler gear on
the timing gears, by which it is also driven.
The pump is a rotor pump with an inner rotor and an
outer rotor mounted eccentrically in relation to each
other. The inner rotor has one "tooth" less than the
outer rotor.
Pump function results from the space between the
inner and outer gear wheels increasing and decreas-
ing. During the first part of the rotor (6) cycle volume
increases, pressure drops and oil is drawn in through
the inlet. After about a half revolution volume is
reduced, pressure increases and oil is forced out
through the outlet.
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