Topic: Re: 4010 Diesel
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Valve protrusion hight is how far the valve sticks up above the gasket surface of the head. Every time the valves and seats are ground the valve sinks deeper into the head. This lowers compression and makes for hard starting, but good running. New valves on the reground seats will sometimes fix it, sometimes it takes new seats and valves, planning the head is another way to bring the gasket surface down closer to the valve seat. This problem is not as noticable on a gas engine as a diesil.
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