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What is the valve clearance adjustment for Cummins 2.8?

1 Answers

OliveLynn

07/30/25 7:27am

Intake valve 0.35, exhaust valve 0.45. Below is relevant information: Valve clearance: It refers to the gap between the end of the valve stem and the valve transmission components when the valve is fully closed. Necessity of valve clearance: When the engine is running, the valve will expand due to temperature rise. If there is no gap or the gap is too small between the valve and its transmission components in the cold state, the thermal expansion of the valve and its transmission components in the hot state will inevitably cause the valve to not close tightly, resulting in air leakage during the compression and power strokes of the engine, and a decrease in power. In severe cases, it may even be difficult to start. To eliminate this phenomenon, valve clearance is usually reserved during cold assembly of the engine to compensate for the expansion of the valve after heating. Some engines use hydraulic tappets, and the length of the tappet can automatically change to compensate for the thermal expansion of the valve at any time, so no valve clearance needs to be reserved.

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