Main Bearing Oil Clearance
MAIN BEARING OIL CLEARANCEMethod by Calculation
Install main bearings to cylinder block and main bearing caps, and tighten main bearing cap bolts with main bearing beam to the specified torque.
^ Measure the inner diameter of main bearing with a bore gauge.
(Oil clearance) = (Main bearing inner diameter) - (Crankshaft main journal diameter)
Standard : 0.035 - 0.045 mm (0.0014 - 0.0018 inch) (actual clearance)
Limit : 0.065 mm (0.0026 inch)
^ If the calculated value exceeds the limit, select proper main bearing according to main bearing inner diameter and crankshaft main journal diameter to obtain the specified bearing oil clearance.
Method of Using Plastigage
^ Remove engine oil and dust on 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 bearing to cylinder block and main bearing cap, and tighten main bearing bolts with main bearing beam to the specified torque.
CAUTION: Never rotate crankshaft.
^ Remove main bearing caps 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".