Gm Global Technolgoy Operations, Inc.

Franz Decarli

Gary J Hazelton

Scott M Kociba

Christopher W Zwolensky

Gregg T Purcilly

Chris Cowland

An engine assembly is provided including an engine crankshaft and a balance shaft connected with the crankshaft and rotatably driven thereby. A vehicle component such as a hydraulic pump or an overhead camshaft is operatively connected with the balance shaft such that it is rotatably driven by the crankshaft through the balance shaft. A camshaft drive system includes the engine crankshaft, the balance shaft and the overhead camshaft.

Camshaft drive system and engine assembly

An internal combustion engine includes a crankcase and an upper oil pan. The crankcase includes a plurality of main bearing caps extending between a pair of side walls, with openings in the main bearing caps and in the side walls. The upper oil pan is configured to sealingly engage the crankcase, and includes openings therethrough, which align with the openings in the main bearing caps and the side walls when the upper oil pan engages the crankcase. Fasteners structurally tie the upper oil pan to both the crankcase side walls and the main bearing caps. The engine may further include a lower oil pan defining a sump and attached to the upper oil pan. The upper oil pan preferably includes an oil filter manifold, an oil scraper, and a plurality of oil passages, while also providing a windage tray.

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Garden City, MI, United States of America

Franz Decarli