Sounds like, IMHO, that you got a needle bearing failure in one (or both) of
the rear trunions. There is no inner race for the inner needle bearing, and
the bearing works directly onto the axel shaft. I had the same problem a
couple of months ago, a "toka-toka-toka" sound that I heard as I slowed or
speeded up, getting faster until I got to highway speed (when I couldn't
hear much of anything anyway).
I met a vendor named Scott Howell at the Atlanta British Car show in
Braselton, Ga over the weekend. He had for sale rebuilt trunions that he
has modified to eliminate this design flaw. For $230 per half-axel (with
yours for exchange), he said that he will modify your trunions, drilling out
the trunion, installing a larger needle bearing and an inner race for the
bearing. This will keep the wear from the axel, which he said have been
made of weaker steel since the early 1970.
No financial interest here, just someone that I met at the car show. Wished
that I had met him two months earlier and tried his solution I still may
have to later if the noise comes back.
Has anyone else tried this?
If interested, here is his address:
HP Imports
5858 Prospect St.
Archdale, NC
336-884-1455
email: hp imports@webtv.net
-----Original Message-----
From: owner-spitfires@autox.team.net
[mailto:owner-spitfires@autox.team.net]On Behalf Of Michael Hargreave Mawson
Sent: Sunday, May 13, 2001 4:21 PM
To: spitfires@autox.team.net
Subject: Noise Diagnostics
Dear All,
Carly has developed a worrying noise over the last day or so - a sort of
dull knocking from somewhere at the rear of the car. The noise is a
little like the sound of a helicopter in the distance, and it speeds up
when I do, and slows down when I do. Hard cornering doesn't affect it,
and nor does engaging the clutch. It is not constant, or terribly
loud, but it is causing me concern. It doesn't sound like a wheel
bearing problem. Any ideas? I'm planning on a 200-mile trip
tomorrow, and a 500-mile round trip next weekend, so if this is serious,
I really need to know!
ATB
Mike
--
Michael Hargreave Mawson, author of "Eyewitness in the Crimea,"
published by Greenhill Books on 28th March, 2001:
http://www.greenhillbooks.com/booksheets/eyewitness_in_the_crimea.html
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