Engine Lubrication System: Notes

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Pressurized lubrication is provided by gear-type oil pump. See Fig 1. Camshaft drives oil pump through shaft of a gear-driven engine speed sensor. Lubrication flows through external oil cooler then into full-flow oil filter. Non-adjustable oil pressure regulator valve is located in oil pump body. Main oil gallery supplies oil through drilled passages to camshaft and crankshaft bearings. Oil flows through galleries to valve lifters, then through hollow push rods to rocker arms.

Fig 1: Cross-Sectional View Of Engine Oiling Circuit

Courtesy of GENERAL MOTORS CORP.

NOTE: Manufacturer recommends changing oil filter at every oil change.