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CRANKSHAFT, MAIN BEARING CONSTRUCTION [ZJ, ZY]

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• A cast iron, 5-bearing, 4-counter weight crankshaft for the ZJ engine model, and a cast iron, 5-bearing, 8-counter weight for the ZY engine model have been adopted for correction of crankshaft related balance.
• 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}