CRANKSHAFT, MAIN BEARING CONSTRUCTION [ZY]

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• Cast iron shaft bearings (5) and counterweights (8) have been adopted to ensure appropriate crank balancing.

• An oil line for supplying oil to each journal is provided in the crankshaft. Crank pins and fillets on both sides of the journal are rolled to bear heavy loads.

• Upper and lower main bearings are made of aluminum alloy. The upper main bearing has oil grooves and oil hole.

• There is no upper and lower bearings' positioning tab for installing the main journal.

• Measure and attach the main bearings (upper and lower) so that they are positioned at the center of the main bearing cap.

• Three kinds of main bearings are available depending on the oil clearance.


Bearing size	Bearing thickness (mm {in})
Standard	2.511-2.529 {0.0989-0.0995}
0.25 {0.01} Oversize	2.625-2.635 {0.1034-0.1037}
0.50 {0.02} Oversize	2.750-2.760 {0.1083-0.1086}