Main Bearing Oil Clearance Inspection

MAIN BEARING OIL CLEARANCE INSPECTION





1. Using a micrometer, measure the outer diameters of the inside main journal.





2. Using a cylinder bore gauge, measure the inner diameter of the stationary gear main bearing.





3. Calculate the main bearing oil clearance from the main journal outer diameter and the main bearing inner diameter.

Main bearing oil clearance = (main bearing inner diameter) - (main journal outer diameter)

^ If it exceeds the maximum specification, replace the main bearing.
- If the clearance is not within the specification after replacing the main bearing, replace the eccentric shaft.

Standard Main bearing oil clearance
Without stopper screw: 0.045-0.085 mm (0.0018-0.0033 in)
With stopper screw: 0.055-0.075 mm (0.0022-0.0029 in)

Maximum main bearing oil clearance
Without stopper screw: 0.1 mm (0.0039 in)
With stopper screw: 0.1 mm (0.0039 in)