MAIN BEARING OIL CLEARANCE INSPECTION

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

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

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

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

• If it exceeds the maximum specification, replace the main bearing. (See MAIN BEARING REPLACEMENT.)

― 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}