• 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.
• 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.
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1
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Thrust bearing
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2
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Upper main bearing
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3
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Front
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4
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Lower main bearing
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5
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Upper main bearing oil groove
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6
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Oil hole
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7
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Main bearing journal
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8
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Main bearing
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9
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Specified measurement
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• Three kinds of main bearings are available depending on the oil clearance.
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Bearing size
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Bearing thickness (mm {in})
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|---|---|
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Standard
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2.511-2.529 {0.0989-0.0995}
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0.25 {0.01} Oversize
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2.625-2.635 {0.1034-0.1037}
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0.50 {0.02} Oversize
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2.750-2.760 {0.1083-0.1086}
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