Patent ID: 7412957

Claim:
A process for producing a crankcase of an internal combustion engine, with at least one main oil channel for supplying the internal combustion engine with lubricant and with at least one oil return channel ( 10 ) for return flow at excess lubricant to a reservoir ( 11 ), the process comprising: forming the oil return channel ( 10 ) in a cast part by a removable oil channel core ( 18 ), forming the oil channel core ( 18 ) for the oil return flaw channel ( 10 ) with a peg-shaped widening ( 12 ), and providing the peg-shaped widening ( 12 ) in an area ( 13 ) intended for later surface treatment, the area ( 13 ) forming a lateral or side insertion surface ( 14 ) for a main bearing lid for a main bearing ( 21 ) of a crankcase ( 15 ), wherein the peg-shaped widening ( 12 ) supports the oil channel core ( 18 ) during coating.