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Thursday, 11. August 2011

Pumped Up 6

But before you install a new oil pump onto the engine, it's always a good idea to double-check the end clearance of the pump gears beforehand. For most small- and big-block Chevys, the pump gear's end clearance should be very close to 0.0025-inch, but it's always best to first check with the pump manufacturer for the spec. To check this dimension, disassemble the pump and de-burr both gears with a small file. Then, reinstall both gears and measure the endplay (from the top of the gears to the top of the pump housing) using a depth micrometer or a feeler gauge. If you install a pump with a measurement that exceeds the 0.0025-inch spec, then the pump will not prime as easily and/or perform as well. If the endplay is greater than this, it can be corrected by sanding the pump body with a piece of solvent-wet 220 wet/dry sandpaper placed on a hard and very flat surface, such as a thick piece of glass. To correct clearance that measures too small, sand the gears on the top end in the same manner as the pump body. In either case, remember to wash everything in solvent and then blow-dry it (rags will leave lint) before reassembly.
By Bob Mehlhoff

mcschool @ 10:39h | comment


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