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The Cummins Engine Valve Cover Gasket keeps engine oil inside the rocker-cover joint on compatible Onan generator engines. A formed shape matched to the specific cover lets the Cummins 1876236 seal that joint instead of acting like a universal sheet gasket. Clamped between the cover and cylinder-head surface, the gasket closes the irregular sealing path around the valvetrain so oil does not seep out during operation. Correct fit matters because an uneven seal can leave the top of the engine vulnerable to persistent oil leakage.
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