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Antique Gas Engine Discussion Meet collectors of hit and miss engines, ask questions about collecting, restoring and showing antique flywheel engines.

Antique Gas Engine Discussion

Piston Stops


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Old 02-25-2005, 11:12:06 AM
Larry K Larry K is offline
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Question Piston Stops

What is the general practice when encountering pistons that have stops? Does a person file the stops off or does one file the piston rings to accomodate the stops?

This is for an upright engine.

Larry Kastens
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Old 02-25-2005, 04:12:53 PM
Chuck Woycke Chuck Woycke is offline
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Default Re: Piston Stops

larry,if the engine is a 2 cycle you need the piston pins (stops) 2 cycle engines have ports that time the engine intake/exhaust .the pins keep the rings from rotating.if not used the end gaps will catch on the cylinder ports and will most likely break the rings.on 4 cycle engines some have the pins also i have found that you can file them off if you are putting new rings in.just make sure you stagger the ring gaps.for example if the piston has 3 rings make sure the ring gaps are a 120 degrees apart.they only use ring pins today on 2 cycle engines and low rpm diesel engines.it's pretty much a thing of the past.modern engines don't use them anymore.-chuck
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