Lubricating system General Oil filter The engines are provided with a pressure lubricating system with an oil filter of the full flow type. The oil filter is of the full flow type which implies that all the oil is filtered before it is pressed out to the bearing areas. Oil pump The filter is placed on the right-hand side of the cylinder block. The filter element consists of folded filter paper. I n the bottom of the filter there is an overflow valve (A, Fig. 82) which opens and releases oil past the filter if the insert should be blocked. The oil pump is placed in the intermediate gear in the transmission, and from where it is also driven.
The pump is of the rotor type with an inner and outer ro- tor placed eccentrically in relation to each other. The in- ner rotor has one "cog" less that the outer rotor. The filter is of the disposable type and is scrapped after use. The function of the pump is based on the increase and decrease of the space between the outer and inner ro- tor cogs. During the first part of the inner rotor's rotation speed the volume is increased, whereby an underpres- sure occurs and oil is induced in through the inlet. After approx. 1/2 turn the space is reduced and a pressure condition occurs which presses out oil through the outlet. Reducing valve The oil pressure is limited by a reducing valve.
The valve is placed in the lubricating system just in front of the oil filter and is fitted on the right-hand side of the cy- li nder block in front of the oil filter. Fig. 82. Oil filter The valve opens at excessive high pressure and releas- es oil back to the sump. A. Overflow valve Crankcase ventilation To prevent overpressure and to separate fuel vapour, steam and other gaseous combustion products, the en- gine is fitted with enclosed crankcase ventilation. 5 1