I need help on how to measure a piston, and to see if it is oversize. Also, are all oversize pistons marked on the c-60 engine.
Thanks
Hamiltonbob
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Measuring a Piston
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Re: Measuring a Piston
All oversized pistons that I have seen were marked , you can check them with a caliper.
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Re: Measuring a Piston
The easiest thing to do to determine piston size is to measure the cylinder bore.
Kinda a rough rule. Measure between the 1st and 2nd ring grooves at 90 degrees from the wrist pin. The piston diameter will be about .002 smaller than the bore diameter on a new piston. As the piston wears this measurement increases. This isn't going to help much since you have to start with bore diameter and condition before proceding to piston measurements. To make things worse all pistons are not manufactured alike.
Kinda a rough rule. Measure between the 1st and 2nd ring grooves at 90 degrees from the wrist pin. The piston diameter will be about .002 smaller than the bore diameter on a new piston. As the piston wears this measurement increases. This isn't going to help much since you have to start with bore diameter and condition before proceding to piston measurements. To make things worse all pistons are not manufactured alike.
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Re: Measuring a Piston
You can use a micrometer and measure the piston 90 degrees from the wrist pin hole on the solid skirt. This should give you an standard or over size measurement. If you measure the bore it has to be below the ridge at the top of the bore. But this area can also taper from wear because the piston does rock when it changes direction. A dial bore gage does better about halfway down in the bore.
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.
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