Crankshaft Main Bearing

Crankshaft Main Bearing Size Codes

Upper





When replacing the crankshaft bearing upper, select a bearing with the size corresponding to the crankshaft journal diameter in the table below.





The crankshaft bearing upper has an identification color at the illustrated position.





Install the selected crankshaft bearing upper.

Lower





When replacing the crankshaft bearing lower, select a bearing with the size corresponding to the crankshaft journal diameter in the table below.





The crankshaft bearing lower has an identification color at the illustrated position.
3. Install the selected crankshaft bearing lower.





Crankshaft Main Bearing Cap Bolts





Install the crankshaft bearing cap with reference to the identification mark as illustrated.





Before using the crankshaft bearing cap bolt again, carry out the check according to the following procedure:
Measure the 2 points on the outside diameter of thread as shown in the illustration.
When the difference between the measured outside diameters is beyond the limit value, replace the crankshaft bearing cap bolt.

Limit value

M10 0.15 mm (0.006 inch)
M8 0.10 mm (0.004 inch)

Apply engine oil to the threaded portion and seat surface of the bolt.

Tighten crankshaft bearing cap bolts to the specified torque according to the tightening order.

M10 37.2± 2.0Nm (27± 1 ft-lb)
M8 9.0± 2.0Nm (80± 17 in-lb)





Make a paint mark on the head of each bolt.

Make a paint mark on the bearing cap 90° from the paint mark made on the bolt, in the direction of tightening the bolt.

CAUTION

When the tightening angle is smaller than the specified tightening angle, the appropriate tightening capacity cannot be secured.
When the tightening angle is larger than the specified tightening angle, remove the bolt to start from the beginning again according to the procedure.

Turn each bolt 90° in the tightening sequence specified in step 1, and make sure that the paint marks on the bolt and cap are aligned.

Crankshaft Main Bearing Clearance

Standard value
No. 1, 2, 4, 5 0.039 - 0.065 mm (0.0015 - 0.0026 inch)
No. 3 0.051 - 0.077 mm (0.0020 - 0.0030 inch)
Limit 0.10 mm (0.004 inch)