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Compression Ring Side Clearance Too Big

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cheg

06-05-2002 18:09:05




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I have the pistons out of my 1935 "D". The top compression ring has too wide of a ring side clearance. I read a past post about squaring out the ring land and adding a spacer or additional ring. Where do I find such a spacer or ring? What cost can I expect to do all this? Machine work, ring, etc..

The other 3 compression ring side clearance are fine. Why does the top ring get so much wear?

Thanks

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John

06-06-2002 05:18:12




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 Re: Compression Ring Side Clearance Too Big in reply to cheg, 06-05-2002 18:09:05  
The spacers are called groove inserts. Their cut in with a special hand operated tool that rides in the worn ring land and shaves the side of the land square with proper side clearance and also cuts a small groove into the inside of the groove to lock the insert in place at the same time. takes only a minute or two per piston with the tool. If the pistons are round which I suspect yours are, you could probably duplicate the groove insert tools function with a metal lathe. (Many pistons are not round, but camturned to a slight oval.) However groove inserts were a good method of saving pistons particularly in older engines built for work not speed. Definitly an older rebuilding method that works well. Any auto machine shop with old men employed will know what your talking about when you ask for a piston groove insert.

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Clooney

06-05-2002 18:46:20




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 Re: Compression Ring Side Clearance Too Big in reply to cheg, 06-05-2002 18:09:05  
Cheg, the top ring gets most of the wear because it takes most of the heat & push of the combustion explosion.
~The D's seem to beat on the top ring pretty hard as I have seen quite a few with worn top ring grooves.
~I lost my ring supplier due to the shop closing, but was given a supplier to try, I haven't needed to contact them yet, but you might try, [see link].....

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Donny-B

06-06-2002 16:34:21




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 Re: Re: Compression Ring Side Clearance Too Big in reply to Clooney, 06-05-2002 18:46:20  
Otto's does not have a .030 ring spacer for the D pistons but he has oil ring rails that will work. (sells for about $5 each) They mic .025 instead of .030. I cut my piston grooves on a metal lathe with a live center to support the outside.



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cheg

06-05-2002 19:49:13




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 Re: Re: Compression Ring Side Clearance Too Big in reply to Clooney, 06-05-2002 18:46:20  
On the top of each piston there is a number. One has 05 stamped on top and the other has 06. What do these numbers mean? The pistons measure exactly 6 3/4 inches in diameter.

Thanks



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