Design and function
Group: 22 Lubrication system
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Oil valves The lubrication oil system has a reduction valve (1) which limits the maximum oil pressure in the engine. Since it is located downstream from the oil cooler, the bypassed oil is also cooled. It opens at about 550 kPa. A safety valve (2) is installed in the oil pump to prevent high pressure which could damage the oil cooler etc. It opens at about 800 kPa.
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A bypass valve (3) located on the oil filter cover opens if the resistance in the filter rises too high. Oil supply to the lubrication points is ensured in this way, even if the filter is blocked, but the oil is no longer cleaned. An inlet valve (4) in the piston cooling duct opens and closes at a set pressure to provide piston cooling, to avoid engine damage. It opens/closes at about 135 kPa. An air vent valve (5) is located between the oil pump and the oil cooler. This ensures that air is removed from the lubrication system during pressure build-up. It closes at about 40 kPa.
Oil pump The oil pump is an internal gear wheel pipe of the “Duocentric” type, and has a built-in safety valve. The oil pump is directly driven from the crankshaft and has a crankshaft seal in its centre.
Oil filter The oil filter removes contamination from the oil and consists of a replaceable filter element (1) located inside a housing (2). When the filter has been in use for a pre-determined time, it must be replaced by a completely new filter insert.
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