[AJD] Oversize piston rings

[Duane Larson]

John,

I can't see that would be a problem - removing about 0.0075" from each end 
(about 0.001% of the ring length) doesn't seem like much.  They probably 
stretch that much when they get hot.

When I got my '31 GP going in 1972 I couldn't find any 6" rings so I ground 
the ends on G rings (6.125") and put them in.  So far, so good.  And it does 
allow you to accomodate some cylinder wear.

I would fit them to get the proper end gap.

Regards,
Duane Larson

----- Original Message ----- 
From: "John Boehm" <rustyacres at yahoo.com>
To: "Antique John Deere" <antique-johndeere at lists.antique-tractor.com>
Sent: Tuesday, September 26, 2006 7:11 PM
Subject: [AJD] Oversize piston rings


> I'm rebuilding the engine on a  1938 JD B, 4 1/4"
> cylinder bore. The best block and pistons that I have
> are .030 oversized. In checking with Deere, .030 over
> piston rings are no longer available, but .045 over
> rings still can be obtained. I also checked with my
> local machine shop as they have been able to obtain
> obselete sized rings in the past. They struck out this
> time and could not get the .030 over either. The
> machine shop suggested getting the .045 rings from
> Deere  and then carefully file and fit the rings to
> the cylinder until I have proper end gap on the rings
> (checking end gap at various points in the bore).
>
>
> Which brings up the question I would like to post to
> list members. Is this proceedure possible or will I
> run iunto some problem that I haven't forseen. The
> alternative is to have a set of rings custom made,
> which would be at least twice as expensive. I would
> appreciate your opinions both for and against using
> the filed down rings.
>
> Thanks,
>
> John Boehm
> Woodland, CA
> Visit my web site at http://vintagetractors.com
>
>
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