**** HELP WANTED FOR TECHNICAL INFO ON WEBER 40DCOE SERIES 151 CARBS ****
I am looking for some technical information on the Weber 40DCOE series 151
dual side-draught carbs. Specifically, I am looking for the technical
specification of the fuel float height, both full open and closed. I suspect
that the closed position is somewhere around 13 mm and full open is around
25 mm. The series 151 carb is not listed in the Haynes manual. Also, the
floats I have are black plastic and have a ’20′ on them (I assume this means
that their weight is 20 grams). They are NOT the round brass/steel/whatever
floats that the Haynes manual lists (with a ridge around the center that you
are supposed to ignore when setting the float height). Can anyone help?
Now, to clear up some things about my original 2 posts:
1. The carbs are fitted with K&N air cleaners, which is why (I suspect) that
the Haynes jet settings are too large – they are probably intended to be used
with air horns. The presence of an air cleaner would create more of a vacuum
inside the carb and thus draw more fuel (in proportions to the amount of air
being taken in).
2. The series 151 carbs have set screws in the side of the bore of each barrel
that hold the choke tube and aux venturi tube in place (each has its own set
screw). There isn’t any need (or room) to cut off some air horns and place
them in front of the aux venturi to hold it in place.
3. The ‘dripping gas from the progression circuit holes’ has been resolved.
The float levels appear to be too high (thus the reason for this post – I don’t
know what they really should be!). I discovered also that the center carb
(which was leaking the worst) had a damaged float check valve, causing the
effective float level to be about .065 inches higher than it should be (sorry,
I don’t own a metric caliper gauge). I set all of the float levels to about
016 inches lower than what they were, and the dripping problem went away.
The float level (fully closed) is now at .516 inches (13.1 mm). This appears
to be on the hairy edge of having the ‘drips’, but I don’t know how close.
Any help out there from someone with the correct technical reference manual
on the series 151 40DCOE Weber carbs? Thanks!
–
John Gibbons Allen-Bradley Company Highland Heights, Ohio
"Welcome My Son, Welcome To The Machine" – Pink Floyd
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