Neil,
I am one of the crowd who always had a problem filling the tube to a point
which I could not see. An old-timer advised me to fill the tube to the
point where when under only the force of gravity the piston will stop
descending at a point where the cap is 1/4 in. above its ultimated
destination. That is, you need exert physical pressure on the cap for only
its last 1/4 in. of movement as you push it down into position.
I find this a simple and quick mode, as compared with removing the dashpots,
but I would be very much interested in how well it comports with your
experience in filling it by removing the dashpots. Does it sound about
right?
Jim Brown
Houston
-----Original Message-----
From: Neil Cotty <neilc@tradesrv.com.au>
To: vintage-race@autox.team.net <vintage-race@autox.team.net>
Date: Wednesday, July 07, 1999 12:31 AM
Subject: Re: SU Carbs
>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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