| 摘要 |
An improved engine block and crankshaft bearing assembly with an arrangement of the engine block and the bearing assembly that simplifies casting of the engine block, with the block having cylinders and a crankcase with opposed spaced support structures in the crankcase for mounting thin profile, forged steel upper bearing caps between adjacent cylinders with the upper bearing caps spanning the spaced support structures and coupling to conventional bearing caps for at least the main bearings of the crankshaft between the end bearings.
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