Service Limits & General Specifications

INNER DIAMETER OF MAIN BEARING HOUSING





^ Install main bearing caps with main bearings removed, and tighten the mounting bolts to the specified torque. Refer to "ASSEMBLY" for the tightening procedure.
^ Using a bore gauge, measure the inner diameter of the main bearing housing.
Standard: 68.944 - 68.968 mm (2.7143 - 2.7153 inch)
^ If out of the standard, replace cylinder block and main bearing caps as an assembly.

NOTE: These components cannot be replaced as a single unit, because they were processed together.

OIL CLEARANCE OF MAIN BEARING
Method of Measurement





^ Install main bearings to cylinder block and main bearing cap. Measure the main bearing inner diameter with the bearing cap bolt tightened to the specified torque. Refer to "ASSEMBLY".
(Oil clearance) = (Inner diameter of main bearing) - (Outer diameter of crankshaft journal)
Standard:
No. 1 and 5 journals: 0.001 - 0.011 mm (0.00004 - 0.0004 inch)
No. 2, 3, and 4 journals: 0.007 - 0.017 mm (0.0003 - 0.0007 inch)
Limit:
No.1 and 5 journals: 0.021 mm (0.0008 inch)
No. 2, 3, and 4 journals: 0.027 mm (0.0011 inch)
^ If clearance exceeds the limit, select proper main bearing according to main bearing inner diameter and crankshaft main journal diameter to obtain specified bearing oil clearance. Refer to "HOW TO SELECT MAIN BEARING".

Method of Using Plastigage





^ Remove oil and dust on the crankshaft journal and the surfaces of each bearing completely.
^ Cut a plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil holes
^ Install main bearings to cylinder block and main bearing cap, and tighten the main bearing bolts to the specified torque. Refer to "ASSEMBLY".

CAUTION: Never rotate the crankshaft.

^ Remove bearing cap and bearings, and using the scale on the plastigage bag, measure the plastigage width.

NOTE: The procedure when the measured value exceeds the repair limit is same as that described in "Method of Measurement".

CRUSH HEIGHT OF MAIN BEARING





^ When the bearing cap is removed after being tightened to the specified torque with main bearings installed, the tip end of bearing must protrude. Refer to "ASSEMBLY" for the tightening procedure.
Standard: There must be crush height
^ If out of the standard, replace main bearings.








MAIN BEARING





Undersize





Bearing Oil Clearance