Note that a J type overdrive (unlike a D or A type) doesn't have a breather,
and it essential that a breather is open elsewhere on the gearbox. If the
breather is blanked off on the gearbox top (as for example on a GT6
overdrive box) and a J type put on the back the result is leakage - been
there, done that.
John Kipping
----- Original Message -----
From: "Brad Kahler" <brad.kahler@141.com>
To: <fot@autox.team.net>
Sent: Wednesday, September 03, 2003 9:49 AM
Subject: OD gasket sealant
> Amici,
>
> The J-type overdrive in Susan's spitfire has been fighting a losing battle
with oil seepage through the gasket joints.
>
> This overdrive was rebuilt a couple of years ago and has been in use for
about one race season. The overdrive itself works fine, but enough oil
seeps out and then leaks onto the exhaust pipe to cause smoke too flow from
under the car. Enough so that she has been black flagged once it.
>
> I retightened all of the joints and that helped to a certain extent but
the real solution would be to dismantle and reseal all of the joints.
>
> So my question is, what type of gasket sealant should be used on these
joints? I'm not sure what was used orginally but it looks like the
non-hardening type of permatex.
>
> Any help in this area would be greatly appreciated!
>
> Brad
> 1957 TR3 vintage racer
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