It is supposed to have a 4th ring. That's what is in my TR4--of
course I bought those pistons and liners way back when you could just
go to the local foreign car parts store (BAP Geon, Beck Arnley?) and
buy them off the shelf.
Allen Hess
> From: CFisher@borgwarner.com
> Subject: four rings on a TR3 motor?
>
> List,
> I just pulled one of the old pistons out of my ailing motor. I was
> surprised
> to see below the three ring grooves (with rings in them) a fourth
> groove
> with no ring in it. This groove had holes drilled through the
> piston wall. I
> haven't seen anything like that in my manual or in the catalogs
> selling new
> replacement pistons. Whats up with that fourth groove?
>
> Cheers,
> Curt Fisher
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