Connecting Rod Bearing Oil Clearance

CONNECTING ROD BEARING OIL CLEARANCE
Method by Calculation





^ Install connecting rod bearings to connecting rod and connecting rod cap, and tighten connecting rod bolts to the specified torque.
^ Measure the inner diameter of connecting rod bearing with an inside micrometer.
(Oil clearance) = (Connecting rod bearing inner diameter) - (Crank shaft pin journal diameter)
Standard : 0.034- 0.059 mm (0.0013 - 0.0023 inch)
(actual clearance)
Limit : 0.070 mm (0.0028 inch)
^ If the calculated value exceeds the limit, select proper connecting rod bearing according to connecting rod big end diameter and crankshaft pin journal diameter to obtain the specified bearing oil clearance.

Method of Using Plastigage
^ Remove oil and dust on crankshaft pin 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 connecting rod bearings to connecting rod and connecting rod bearing cap, and tighten connecting rod bolts to the specified torque.

CAUTION: Do not rotate crankshaft.





^ Remove connecting rod 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".