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multihobbyguy

Piston Movement

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multihobbyguy

I am working a C-160 that seemed to be down on power and rpms so I decided I would pull the carb and head so that I could clean them up and inspect the engine some. I found a leaking head gasket and a worn throttle shaft and a little carbon build up. The head ended up being warped but I ran it back and forth on a piece of sandpaper on my surface plate and in no time it was back in spec. I checked the bore and there is minimal wear. There is no ridge at the top of the cylinder either. The tractor does not smoke or use oil. When I was cleaning the top of the piston I noticed the piston will move back and forth with in the cylinder with some pressure. My question is this normal? I really don't want to take this thing apart to measure the piston and see if it is within tolerance with the bore. It has been awhile since I have rebuilt a engine so I can not remember if that happened before or not. I figure that it has to have some movement to compensate for expanding when it warms up. Long story short is this normal? Thank you, Chris.

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wp205a

Yes, I think your problem is solved.

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SousaKerry

Some slop is normal IIRC about .010.  If it ain't burning oil then I would say leave it alone.

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multihobbyguy

Thank you! That is great to hear. I will probably put it back together by this weekend since I don't have to tear it completely down. Now I need to find a short piece of bronze to make my throttle shaft bushing. Thanks again! Chris.

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Fordiesel69

It is normal.  It can get quite loose before it starts to cause problems.  The end gaps on the rings are the same way.  On low budget fixes, I have slapped new rings on an old worn out cylinder and have stopped the oil burning.  It will breath a little more life into a worn engine.

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