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Q:The cam bearings in my engine have spun. Can it be repaired by boring and putting in oversized bearings. I know the mains can be line bored and done this way. Thanks
A:Typically, a cam bearing spins due to inadequate lubrication, improper bearing clearances, cam tunnel misalignment, or a bent camshaft. When disaster strikes and the cam and bearing stick together, the bearing insert spins with the cam and the resulting friction removes material from the cam housing in the block. This increases the diameter of the afflicted cam bores and leaves a rough surface in its wake. The traditional solution is to cut the cam bores oversize using a line-boring machine and install matching oversize bearings. Repair bearings are available for most common applications and feature larger outside diameters so they have the correct press fit in the block's cam bores after they are machined. These bearings feature stock inside-diameter measurements to suit the stock cam journals.