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Lubricating system

Lubricating system

Lubricating system

Engine lubrication is by means of a force feed system, where the oil pressure is generated by a gear pump comprising a gear wheel and an eccentric ring wheel. The pump is located at the timing end of the engine and is driven by the crankshaft. Oil is drawn up from the sump through a strainer and suction pipe to the oil pump. A reducing valve in the oil pump housing limits the oil pressure while excess oil passes back to the suction side of the pump. The reducing valve is controlled by cooled and filtered oil.

There is an oil pressure contact located on the oil pump housing.

When the oil pressure becomes too low the sensor grounds the electrical circuit for the warning lamp which is located in the main instrument unit. The crankshaft main bearings and connecting rod bearings receive lubrication via ducts in the block and crankshaft, while the pistons and cylinder walls are lubricated with oil mist and spray in the crankcase. A rising duct also runs from the main duct of the cylinder block, up to the cylinder head to lubricate the camshafts and valve gear. The oil flows out in drilled ducts to all camshafts and tappets via the hole for one of the cylinder head's screws. Bleeding of oil takes place by means of a screw in the cylinder head.


Oil filter

The oil filter is fitted easily accessible on the cylinder block exhaust side. If the filter becomes clogged by dirt preventing the flow of oil then there is an overflow valve fitted in the engine block. The oil filter has a metric thread and must not be mixed up with filters which have imperial threads.


Oil sump

The oil sump is made of light alloy and adapted to the cylinder block. Sealing compound is placed directly on the flat surface of the flange.