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Lubricating system

Lubricating system


Lubricating system

The engine lubricating system has forced-flow lubrication, with the oil pressure being generated by a gear pump consisting of a pinion and an eccentric ring gear. The pump is located in the timing end of the engine and is driven by the crankshaft.

Oil is drawn from the sump to the oil pump via a strainer and pipe. A pressure-reducing valve in the oil pump housing limits the oil pressure and returns surplus oil to the inlet side of the pump. The pressure-reducing valve is controlled by cooled and filtered oil. The oil then continues via the oil filter to the heat exchanger and on into the main oilway of the engine. From the main oilway it continues to the main bearings and the distribution channel to lubricate the individual cylinder heads.

The oil is also led back from the main oilway to the oil pump housing to feed the front main bearing and to regulate the pressure in the pressure-reducing valve. To ensure lubrication of the gudgeon pins, the oil is led via the crankshaft and a longitudinal hole through the connecting rod to the gudgeon pin in the piston.

Also mounted on the oil pump housing is the oil pressure sensor. When oil pressure drops too low, the sensor grounds the electrical circuit for the warning lamp in the main instrument unit.

The camshaft bearings and tappets are supplied with oil from a horizontally drilled oilway for each camshaft. Each oilway has a purging nozzle to ensure that all air is bled out when starting.

Oil filter

The oil filter is screwed into the oil filter adapter and is easily accessible.

Note

The same oil filter as for the 4-cylinder SAAB 9-5 should be used.