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AB Volvo Penta / Diesel Engine TAMD71B
Fig. 8.2 Basic diagram, lubrication system
8. Oil pump
10. Lubricating oil filter
12. Overflow valve
13. Piston cooling valve
14. Relief valve
15. Filtered oil (pressure) to lubrication system
22. By-pass filter*
23. Oil cooler
24. Oil (pressure) to piston cooling
25. By-pass valve
*Note! By-pass filter is an accessory on TAMD71 engines.
8.2 Valves in the lubrication
system
The oil flow in the engine is controlled by four
spring-loaded valves. Three of these are located
in a mounting on the right of the engine and one
at the lower edge of the cylinder block on the left
of the engine.
– The relief valve (14) limits the system oil
pressure in the engine. This valve opens if
the pressure is too high and allows oil back to
the oil sump at high speeds or if the engine is
cold and the lubricating oil is more viscous.
– The overflow valve (12) opens and allows oil
past the lubricating oil filter if the resistance
through the filter is too great. This way oil can
flow into the engine lubrication system even if
the filter is clogged. But the oil entering the
system is unfiltered. So it is important that the
filter is replaced according to the intervals
recommended in the maintenance schedule.
– The piston cooling valve (13) regulates the
flow of oil through the oil cooler and on to pis-
ton cooling.
– The by-pass valve (25) permits increased oil
flow through the oil cooler. The valve opens
and returns excess oil not required for piston
cooling back to the oil sump.
Fig. 8.3 Valves in the lubrication system
12. Overflow valve
13. Piston cooling valve
14. Relief valve
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