CRANKSHAFT, MAIN BEARING CONSTRUCTION [ZJ, Z6]


B3E011011301T01
• A cast iron, five-bearing, four-counter weight crankshaft has 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.

1
Fillet roll area
2
Oil passage

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

1
Thrust bearing
2
Upper main bearing
3
Front
4
Lower main bearing
5
Upper main bearing oil groove
6
Oil hole
7
Main bearing journal
8
Main bearing
9
Specified measurement

• 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}