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main bearing, measuring of clearances

For journal bearings clearance is measured in the top of the journal. Clearance is for ensuring proper oil flow through the bearing. Procedure-Visually examine the sides of bearing shells, checked for squeezed up metal in the bearing edge. Look for white metal fragments in the oil
pan. Clearance measuring procedure: calibrate the dial gauge in the calibration block and set zero. Remove the screw for lube oil pipe in the main bearing cap and record the clearance between upper shell and journal by inserting the tool in the hole.
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