Gm Global Technolgoy Operations, Inc.

Douglas P Leu

Thomas P Newcomb

Brian Daniel Kaminski

Larry R Shade

Norman L Neuenschwander

An engine block mold package includes a barrel crankcase core having a plurality of barrels on each of which a respective cylinder bore liner is disposed. Each cylinder bore liner includes an inside diameter that is tapered along at least a portion of its length to match a draft angle present on the barrels to permit removal of the barrel crankcase core from a core box in which it is formed.

Casting of engine blocks

An engine block mold package includes a barrel crankcase core having a plurality of barrels on an integral crankcase region and one or more locator surfaces on the crankcase region. The barrels are formed by a barrel-forming tool element of a core box. The barrel-forming tool element is configured to also form the locator surface(s) on the crankcase region such that the locator surface(s) is/are accurately positioned relative to the barrels and thus the cylinders formed in the engine block cast in the mold package. The locator surface(s) can be used to locate the engine block casting in subsequent aligning and machining operations without the need to reference a curved surface of a cylinder bore liner.

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Wauseon, OH, United States of America

Douglas P Leu