Service Limits & General Specifications

MAIN BEARING HOUSING INSIDE DIAMETER





^ Install the main bearing caps with the main bearings removed, and tighten the bolts to the specified torque.
^ Measure inside diameter of main bearing housing.
Standard: 68.944 - 68.968 mm (2.7143 - 2.7153 in)
^ If out of the standard, replace cylinder block and main bearing caps as an assembly.

NOTE: These components must be replaced as a single unit, because they were processed together.

MAIN BEARING OIL CLEARANCE
Method of Measurement





^ Install the main bearings to the cylinder block and main bearing cap. Measure the main bearing inside diameter with the bearing cap bolts tightened to the specified torque.
(Oil clearance) = (Inside diameter of main bearing) - (Crankshaft journal diameter)
Standard:
No. 1 and 5 journals: 0.001 - 0.011 mm (0.00004 - 0.0004 in)
No. 2, 3 and 4 journals: 0.007 - 0.017 mm (0.0003 - 0.0007 in)
Limit:
No.1 and 5 journals: 0.021 mm (0.0008 in)
No. 2, 3 and 4 journals: 0.027 mm (0.0011 in)
^ If measured value exceeds the repair limit, select main bearings referring to the main bearing inside diameter and crankshaft journal diameter, so that the oil clearance satisfies the standard.

Method of Using Plastigage





^ Remove oil and dust on the crankshaft journal and 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 the main bearings to the cylinder block and main bearing cap, and tighten the main bearing bolts to the specified torque.

CAUTION: Do not rotate crankshaft with plastigage installed.

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

NOTE: The procedure when the measured value exceeds the repair limit is the 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 the bearing must protrude.
Standard: There must be crush height
^ If standard is not met, replace main bearings.





MAIN BEARING





Undersize





Main Bearing Oil Clearance