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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