How Motorcycles

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plain bearing operation principles hydraulic oil clearance bearings as explained in a different article prevent a rotating bearing journal from touching its holder bearing but these kind of bearings also utilize another system to prevent wear bearing inserts the crankshaft main bearing inserts have slots in them to allow the oil to be pumped into the bearing from passages in the crankcase the connecting rod bearing inserts have no slots because the oil is pumped through the crankshaft to the connecting rod journal crankshaft is supported by bearing inserts bearing insert crankcase half connecting rod bolt bearing inserts connecting rod bearing insert crankshaft main bearing insert connecting rod cap nut the locating tab prevents the bearing insert from moving side to side locating tab bearing insert cross section the outer steel structural layer is by far the thickest part of the bearing insert as it provides the shape and strength the soft copper metal layer provides the support for the babbit metal layer the babbit metal layer is a very soft metal layer that allows small pieces of debris to lodge into the babbit layer itself to prevent the debris from bridging the gap between the rotating journal and the bearing the gap is the oil clearance gap by absorbing these errant debris particles that may happen to venture into the oil passage ways the babbit layer prevents the bearing from seizing bearing insert zoom steel layer copper layer babbit layer oil gap rotating journal shaft debris embedded in babbit layer babbit metal layer soft copper layer outer steel structural layer babbittmetal noun Isaac Babbitt 1862 American inventor an alloy used for lining bearings especially one containing tin copper and antimony