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Re: MGB Piston Rings

To: Barney Gaylord <>, mglist <>
Subject: Re: MGB Piston Rings
From: Frank Krajewski <>
Date: Wed, 22 Dec 1999 09:25:37 -0500
Make certain you have cleaned the ring grooves completely and there is no
carbon still residing in there. You can buy a tool made just for this purpose
or you can snap one of the removed rings (hopefully one you won't have to reuse
when you break a new one!). Use the ring you just snapped as your tool to
thoroughly clean the "lands" or grooves in which the rings seat. Carbon
deposits in those same grooves will prevent proper seating/installation. Hope
it helps.
Frank "Swamp Yankee" Krajewski

Barney Gaylord wrote:

> At 06:28 PM 12/21/99 -0600, Tyson Sherman wrote:
> >.... They're 4 ring pistons from Victoria British .... The rings are Deves
> from Northwest Import (both are .030" over).
> >
> >The original oil control ring consisted of top and bottom rails and a
> center zigzag part.  The new one does the same but has an expander in the
> middle.  The expander doesn't seem to fit all that well; is it correct to
> install this expander on a B?
> Generally, yes.  The expander and the spacer combine to make the two thin
> oil wiper rings expand to what looks like a fairly large diameter when they
> are first installed in the free position.  When you apply a ring compressor
> (firmly) they should scrunch right down to the OD of the piston.  If they
> do you're home free with the right parts.  If they do not, then the bottom
> ring groove may not be deep enough for these oil control rings.  The
> paperwork that comes with the rings should (may) specify the depth of the
> grooves.  You might check the depth of the grooves in the new pistons
> against the old ones.  I have had good luck with Deves rings, never had any
> problem fitting them.  My last set of pistons was Aerolite brand, and the
> Deves rings fit fine.  Give them a good squeeze with the ring compressor.
> My bet says they work okay.
> Barney Gaylord
> 1958 MGA with an attitude

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