Lubrication and oil systems

Engine block

The cylinder block is made of cast iron and cast in one piece. The cylinder block sides are cup-shaped around each cylinder in order to obtain high rigidity and good sound proofing. All lubricating oil channels have been machined directly in the block. There are two longitudinal channels, on the right side of the piston cooling channel and on the left side of the main lubricating channel. The channels are plugged front and back. The rear face also has a channel for oil supply to the transmission. At the lower level of the block, a bracing frame of 6 mm (0.236") steel plate is mounted to decrease vibrations and thus also engine noise. The oil pan is made of plastic and mounted with 16 spring loaded screws in the cylinder block foot. The seal between block and oil pan consists of a rubber strip, in one piece, placed in a groove in the sump. The cylinder block main bearing caps is guided by sockets pressed into the cylinder block (1). In order to avoid incorrect placement, the thrust bearing caps are numbered 1-7 and feature cast bosses in both blocks (2) and caps (3). The underside of the bearing caps are also marked with arrows, which should be turned towards the engine’s inlet side. The cylinder head gasket is made of steel in one piece, for the whole engine. The gasket incorporates vulcanized rubber seals for oil and coolant pass-through. The gasket also has a number of convex embossings in order for the cylinder to slide on the gasket during the fitting, and not damage the rubber rings in the gasket. The cylinder head is lowered towards the guide pins in the cylinder block leaving a small distance to the transmission plate. The cylinder head is then pulled horizontally towards the transmission plate. When in place, it is screwed against the cylinder block and the embossings are flattened out.

Cylinder liner

The cylinder block is equipped with wet, replaceable cylinder liners that are centrifugally cast of cast iron alloy. The coolant space around the cylinder liners is sealed against the cylinder block with three sealing rings. The upper part is sealed by a ring below the liner collar. The lower part of cylinder liner is sealed using two rubber rings. The top one, closest to the coolant, is black and the lower one towards the oil side is purple.