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Machine Shop and Tool Talk

Piston Clearance Advice


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  #11  
Old 12-03-2017, 11:46:02 AM
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KeithW KeithW is offline
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Default Re: Piston Clearance Advice

If I did a job for a friend and it turned out wrong I would want to know so I could make it right.
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  #12  
Old 12-03-2017, 03:08:12 PM
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Default Re: Piston Clearance Advice

I just might I guess. I gave him the piston when he put the sleeve in so he could get everything correct.... It will be a spell however, he is in Florida for the winter.

I will see what a piston would cost in the mean time.
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Old 12-03-2017, 08:06:38 PM
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Vinny Cavaliere Vinny Cavaliere is offline
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Default Re: Piston Clearance Advice

Yes the piston to cylinder clearance is too much. However a new set of rings with a tighter inside dia. on the ring to the piston should solve the problem. A really good place to make rings is in Cleveland Ohio.
Vinny
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Old 12-03-2017, 08:13:59 PM
AngrySailor AngrySailor is offline
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Default Re: Piston Clearance Advice

Good God man! That's crazy talk! Not trying to be a dick but no... the ID of the ring cannot touch the OD of the ring land or be used to take up clearance. Doesn't work that way.
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Old 12-03-2017, 08:48:20 PM
Charley K Charley K is offline
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Default Re: Piston Clearance Advice

Well I also hate to be a.... See my previous post. There are only two ways to fix this. New liner or larger piston. Hone to specs. CK
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  #16  
Old 03-11-2018, 09:43:57 PM
SteveK SteveK is offline
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Default Re: Piston Clearance Advice

Here is an update on this engine. While I had the piston and rod out I took the wrist pin out and looked at it and the bushing. The pin was quite worn and the bushing as well. Very loose. So I made a new wrist pin and pressed in a new bushing then reamed the bushing until the pin just fit. Then I drilled the oil hole and cut some oil grooves in the bushing. While the piston was loose I slid it in the bore and once the whole piston is in the bore I cant wiggle it, only when the skirt is out of the bore at BDC can I move the piston up and down.
So I re assembled everything and fired it up, NO NOISE Nice and quiet.
I don,t have a bore gauge just telescoping gauges so I am guessing I probably gave an inaccurate measurement on the bore size, also the only thing I had to measure the piston diameter with is calipers. SO either my measurements were wrong and the fit was not sloppy or it is sloppy but not what was making noise. I guess I'll just run it. Thank for the comments at any rate.
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Old 03-12-2018, 01:51:52 AM
cobbadog cobbadog is offline
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Default Re: Piston Clearance Advice

Glad you found a solution to your problem and that you can go out and make some noise for the neighbours.
Something I was going to suggest if it was possible was to machine another ring gland lower down the skirt of the piston like on some tractor pistons. That might have helped hold the skirt away from the bore.
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Old 03-12-2018, 10:26:51 AM
ronm ronm is offline
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Default Re: Piston Clearance Advice

And once again...
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  #19  
Old 03-12-2018, 06:20:48 PM
SteveK SteveK is offline
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Default Re: Piston Clearance Advice

Thats funny Ron! Accurate!! Good lord....I like it
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