Scott,
The fork at the bottom of the jet is held onto the jet by a square
headed screw. This screw can sometimes leak, I had both of them leak on
our TD and have seen them leak on other peoples' cars. The fix is to
back the screw out, clean the threads on the screw and in the jet and
then put a drop of locktite on the screw and tighten it back up. The
trick in all of this is to hold the jet so the screw cam be loosened and
tightened, without damaging the sides of the jet.
Secondly, if you are using the cork jet seals and the cork jet nut seal
(the large seal at the bottom of the carburetor body), these may be your
source of leaks. I have tried all of the tricks listed and have never
had any luck with the cork seals, while others swear by them. I got rid
of my leaks around the seals by going to teflon 'O' rings around the
jets and a standard neoprene 'O' ring Parker number 2-211 (available
from NAPA) for the large jet nut seal. The teflon 'O' rings are
available from Tom Bryant at 207-443-6338. You will need to use two 'O'
in each seal position to make them work (for a total of 8 'O' rings to
do both carburetors) and you will need to make sure that the jets are
polished absolutely free of any nicks or scratches and all of the sharp
edges around the top and the cross drilled hole so that the teflon
doesn't get cut during installation.
Good luck,
Dave
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