The cylinder block (Fig. 4.3) – with dry thin-walled cast iron liners, is made of a light alloy, the liners of which can be repaired (bored). The cylinder block is made entirely of a light alloy based on aluminum. The liners are installed during the block manufacturing process and are not subject to replacement. The arrangement (camber) of the V-shaped engine blocks is 90°. In the lower part of the cylinder block (crankcase), there are five bearing seats for the crankshaft main bearing shells.
The main bearing caps undergo final processing together with the block, so they are not interchangeable. In case of wear or minor damage, the cylinder wall can be restored by honing or grinding at a vehicle service station (TSS), followed by installation of intermediate or repair size pistons.
The diameter of the cylinders is measured with a bore gauge in three zones in mutually perpendicular directions, at a distance of 10 mm from the upper and lower edges and in the center of the cylinder.
The article was copied from an online resource: BMWman.ru