Oil Clearance Of Main Bearing
WARNING: This page is about a different variant/trim than selected.
Method of Measurement
- Install the main bearings to the cylinder block and bearing cap. Measure the main bearing inner diameter with the bearing cap bolt tightened to the specified torque.
(Oil clearance) = (Inner diameter of main bearing) - (Outer diameter of crankshaft journal)
Standard:
No. 1, 3, and 5 journals : 0.012 - 0.022 mm (0.0005 - 0.0009 in)
No. 2 and 4 journals : 0.018 - 0.028 mm (0.0007 - 0.0011 in)
Limit : 0.1 mm (0.004 in)
- If the measured value exceeds the limit, select main bearings referring to the main bearing inner diameter and crankshaft journal outer diameter, so that the oil clearance satisfies the standard. Refer to "HOW TO SELECT PISTON AND BEARING ".
Method of Using Plastigage
- Remove oil and dust on the crankshaft journal and the surfaces of each bearing completely.
- Cut the Plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil holes.
- Tighten the main bearing bolts to the specified torque.CAUTION: Never rotate the crankshaft.
- Remove the 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 limit is same as that described in the "Method by Calculation".