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Re: SU Carbs

To: <vintage-race@autox.team.net>
Subject: Re: SU Carbs
From: "Neil Cotty" <neilc@tradesrv.com.au>
Date: Wed, 7 Jul 1999 14:50:55 +1000
TIm,

> Last night when I got home, I filled the dashpot up, replaced the cap and
> then rechecked.  No ATF.

So you didn't drive it in the intervening time?The fluid just disappeared?
Are you sure it's *all* gone? Well, on an SU, the oil goes into a hollow
tube thats physically part of the piston. If you overfill the tube by
filling via the dashpot - easy to do as you can't really see the top of the
tube, the excess will overflow onto the top of the piston and probably into
the carb body over time. You only need to fill to just below the top of the
tube taking into account the volume of the plunger/cap assembly. You don't
fill to the top of the dashpot. Take the dashpot off and you will see the
piston and the tube. I tend to take the dashpots off and fill the tube
instead, as that way I can't overfill.

If all your fluid is gone, then you must have a crack somewhere as I can't
imagine any other reason for total fluid loss when the car is sitting still
and not operating.

Cheers,
Neil.


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