[Fot] TR3/4 Timing chains

[JS Performance Motoring, LLC]

Joe,
       The Roadster Factory has a higher quality, stock type tensioner for
the TR3/4 (and also  versions for the TR6/GT6/Spitfires).  These have
worked well for me.
https://www.trfbasic.com/shop/p/43404-tensioner


Jason Sukey
JS Performance Motoring, LLC
440.984.7720
jason at jsperformancemotoring.com
www.jspmparts.com
https://www.facebook.com/JSPerformanceMotoring/


On Tue, Aug 11, 2026 at 6:26 PM Joe Boruch <jaboruch at yahoo.com> wrote:

> Amici, my TR3 engine seized at Lime Rock back in June.  Finally got around
> to pulling the engine and tearing it down.  Found a broken timing chain
> along with pieces of the tensioner and that the retaining pin for the
> tensioner was broken off of the front plate.  The chain had many laps on it
> - I probably should just change it with each refresh, rather than reusing
> it.
>
> Any suggestions on better chains and tensioners?  I see that Moss sells an
> "uprated" chain for about $70 compared to under $15 for other chains.  It's
> worth the $70 if it lasts, but is it really better?
>
> Also need an adjustable cam gear.  I had been using one from Cambridge
> Motorsports that I had for many years.  Any suggestions?
>
> I have found broken tensioners in previous tear downs, but they were
> caught before causing anything worse.  Does anyone sell or fabricate and
> uprated tensioner similar to what MGs use?  I see that Racetorations makes
> one for TR5/6s.
>
> Joe(B)
> _______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
> http://autox.team.net/mailman/options/fot/jason@jsperformancemotoring.com
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20260811/084885a7/attachment.htm>