How to Replace & Repair an Oil Pump on a 1980s Chevy 305

The oil pump on your Chevy 305 engine utilizes gears driven by the crankshaft to lubricate the engine with oil to reduce friction and remove heat from pistons and bearings. The pump filters motor oil through a wire mesh strainer and propels it through the engine. If the oil pump fails, improper lubrication results in engine failure. Replacing the oil pump can take up to an hour or more to complete, but it is still simple enough to perform that you can do it yourself and save some money.

Tools Used: Ratchet and socket, Jack, Jack stands, Drain pan, Oil pump, Oil pan gasket, Putty knife with sharp blade, Oil

Replace & Repair an Oil Pump

Disconnect the negative battery cable with a ratchet and socket, raise the front of the truck with a jack, and allow the truck to rest on jack stands.

Drain the oil by placing the drain pan beneath the oil pan and removing the drain plug using a ratchet and socket, then remove the oil pan using a ratchet and socket.

Scrape the old oil gasket off using a sharpened putty knife, clean the gasket mounting surface with a rag, then remove the oil pump using a ratchet and socket.

Install the new oil pump with a ratchet and socket. Install the new gasket, reinstall the oil pan and follow the previous steps in reverse to complete the installation.

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