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piston to deck clearence


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anyone know the proper procedure for measuring piston to deck clearance? or how about the improper way? what fantastical measuring device is really required for accurate readings?

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No way that I know of without taking the head off. Piston at top dead center, measure from the flat part of the piston to the deck and add the compressed gasket thickness.

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Oh yeah, a depth mic. is the most accurate but you can get a fair idea with the probe end of a common caliper. Measure as close to the center of the piston pin as possible to negate the rocking of the piston in the bore, which varies with piston to wall clearance.

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You can do a mock buildup of the motor (head, cam, timing chain, lifters and pushrods in #1)) with the head gasket. Put some modeler's clay on the piston (don't cover the entire top of the piston, but a good enough area that the clay won't "slide" when the valve make contact with it). You then rotate the crank two complete times. Then remove the head and measure the clay. This will give you an accurate look into the clearance you have.

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Thanks guys the motor is already apart so thats not a prob just gotta shove it together to get the measurements. <BR>Thanks again!

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