> -----Original Message-----
> From: spitfires-owner@autox.team.net [mailto:spitfires-
> owner@autox.team.net] On Behalf Of Nolan
>
> The four bolt shanks are what locates the flange faces together, ensuring
> they are centered to each other. Going with a non-spec bolt that has a
> smaller shank will allow the flange faces to not be centered, increasing
> the likelihood of vibrations.
For the earlier Spitfires at least, the factory part numbers differ between
the propshaft and halfshaft (driveshaft) bolts. The parts have the same
physical dimensions with the unthreaded shanks, the difference is presumably
down to the material grades used. The halfshaft bolts need to deal with the
additional suspension stresses, so an increased specification would be
logical. Most (all?) suppliers have settled on a single bolt type for these
applications.
I don't know if the same was true of the later cars with their larger
driveshaft bolts, I don't have such comprehensive references for those cars.
If anyone would like the factory part numbers then I can dig these out and
post them later, just ask,
Cheers,
Bill.
Rarebits4classics
.......just what you've been looking for
PO Box 1232
Calne
Wiltshire
SN11 8WA
United Kingdom
http://www.rarebits4classics.co.uk
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