[TR] TR-3 Rear Crankshaft Seal

Tony Drews tony at tonydrews.com
Mon Apr 9 19:45:58 MDT 2012


Here's the link to the uncle jack's engine building tips page:
http://www.tonydrews.com/uncle_jacks_engine_building_tips.htm

Tony Drews

At 04:24 PM 4/9/2012, Randall wrote:
> > ISTR that there are a couple of options for replacing this seal with
> > modern
> > technology. TRF's Viton seal doesn't require machining the crank, while
> > Moss's
> > does. Are there any other options?
>
>According to an article published in the local club newsletter many years
>ago, there are (at least) two versions of the "grind the crank" conversion.
>
>Also, while it's not exactly modern technology; supposedly the original seal
>works quite well if you use a mandrel with the proper dimensions.  The
>dimensions given in the manual are not correct.  I believe TRF sells
>mandrels with the updated dimensions (last I heard, Moss did not).
>
>Personally, I am going with the Viton seal.  This conversion was developed
>by a well-known Triumph racer, running on race tracks where "marking its
>spot" can get you disqualified (and barred).  He tried the other conversion
>and found it wanting.
>
>If you do go with one of the "grind the crank" conversions, be sure you get
>the right dimensions for grinding the crank.  The instructions have been
>revised multiple times, each time making the crank surface larger.  Also
>check out "uncle jacks" web site for installation tips.
>
>-- Randall
>
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