Connecting Rod Bearing Oil Clearance
Method by Calculation
- Install connecting rod bearings (2) to connecting rod (3) and connecting rod bearing cap (1), and tighten connecting rod bolts to the specified torque. Refer to "DISASSEMBLY AND ASSEMBLY " for tightening procedure.
- Measure the inner diameter of connecting rod bearing with an inside micrometer.
(Bearing oil clearance) = (Connecting rod bearing inner diameter) - (Crankshaft pin journal diameter)
Standard : 0.037 - 0.047 mm (0.0015 - 0.0019 in)
Limit : 0.07 mm (0.0028 in)
- If clearance exceeds the limit, select proper connecting rod bearing according to connecting rod big end diameter and crankshaft pin journal diameter to obtain specified bearing oil clearance. Refer to "HOW TO SELECT PISTON AND BEARING ".
Method of Using Plastigage
- Remove engine oil and dust on crankshaft pin 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 cap, and tighten connecting rod bolts to the specified torque. Refer to
"DISASSEMBLY AND ASSEMBLY " for the tightening procedure.CAUTION: Never rotate crankshaft.
- Remove connecting rod cap and bearing, and using the scale (A) 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".