Mercury C2OZ-6262-A Bearing - Camshaft

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Measure the bearing journals with a micrometer to determine their size and whether or not they're out-of-round. The inside diameter of each bearing can be measured with a telescoping gauge and micrometer. Subtract each cam journal diameter from the corresponding bearing inside diameter to obtain the bearing oil clearance. Compare the clearance for each bearing to the Specifications. If it's excessive for any of the bearings, have new bearings installed by an automotive machine shop.

Camshaft lobe lift can be checked with the camshaft installed in the engine or after it has been removed using the following procedure. Measure the major (A) and minor (B) diameters of each lobe with a micrometer and record the results. The difference between the two is the lobe lift. If the measured lift for any lobe is less than specified, replace the camshaft.