I have to admit I am getting lost here.
My supplier (Simon, from TR Enterprises) in the UK, says crank must be
ground down to 2.5'', ie 63.5mm, anything more puts too much pressure on the
lip seal and it will then groove the crank.
Simon told me it is originally a Land Rover seal and the size is exactly
2.5'', which is logical as it was originally an English fitment.
Moss' leaflet gives a tolerance of +0.1mm, - 0.0 mm. So the minimum for them
is 63.5.
But to go from 63.5 or 63.6 to 64.135 (2.525'') seems a lot more.
Tony, you mean it leaks if crank is ground to 63.5mm? What is your
experience with this dimension?
Thank you !
Cheers
Alexandre
-----Message d'origine-----
De : fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] De la
part de Tony Drews
Envoyi : mardi 5 octobre 2010 07:55
@ : Dan Cronin; Friends of Triumph Triumph
Objet : Re: [Fot] Crank--Rear Main / Scroll
For the aftermarket lip seal like is sold by Moss, British Parts Northwest,
and BFE, the correct crank diameter is 2.525". Despite explicit instruction
to use that dimension, my Crower crank was turned to 2.500", as the seal
instructions indicate it should be (incorrectly). I've managed to make it
seal by using a very sharp knife to cut a little bit off of the edge of the
seal. Some rebuilds that works better than others. I also shorten the
spring to a bit under 8" so there's a fair amount of spring pressure on the
seal.
The seal the Christian Marx developed, marketed in the USA by Joe Alexander
is for stock cranks that have the scroll seal.
- Tony Drews
At 01:02 PM 10/4/2010, Dan Cronin wrote:
>Listers
>Some time back in mid 07 I purchased a Crower E4340 Billet Steel Crank
>for my TR motor build which I am just now getting around to......had
>the rear lip milled to the 63.5mm (2.5") that was the collective
>thought (manual and instructions for the improved rear main lip oil
>seal) and now find that most think this was in error! Am I right that
>now the proper size for the seal is 71.57mm (2.8"), and if so what is
>one to do if he has the "old" dim.? Can the journal be built up by
>hard chroming and them re-milled to size? What other options can you
>think of that would permit successful use of the 2.5" scroll with the lip
seal? What have others done to surmount this problem?
>Thanks, Dan C.
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