"Phillips, Frank" wrote:
> Listers,
>
> First, thanks to all who helped with advice this weekend. Unfortunately the
> answer to my float bowl flooding problem came to me in the middle of the
> night and Sunday I corrected the problem. It was my own stupidity (that I
> don't know how to correct <g>). I had placed the float needles in backwards!
> My 68B had Grose Jets and I was replacing them with standard jets and I'm a
> newbie, that will never happen again...
>
Glad to hear you found the problem, we were all newbies at one time and
mistakes
are how we learn...
>
> Now the current problem! My rear piston is sticking. When I use the lifting
> pin or a small screwdriver to raise the piston (as in tuning the carbs) the
> piston has an initial point of resistance that must be overcome to rise.
> According to Haynes I should use metal polish to clean the area causing the
> sticking. I have two questions:
>
> 1) How do I determine the spot that is causing the problem or should I
> simply make the whole piston and chamber insides shine?
I had a similar problem, one of my dashpots had a small ding/burr inside
that
would catch the piston. You can probably identify the area that it is
sticking
in as it may be shinier than the rest due to the 'polishing' of the
piston as it
goes past. Verify that your dashpot(s) are not out-of-round using both
pistons
on each dashpot. Pick the combination that feels the best. John Twist
outlines a
droptest you can perform:
Clean piston and dashpot and remove carb damper. Wrap masking tape
around the
vent holes on each piston, insert piston in the dashpot, invert and
allow it to
drop by it's own weight. Time the drop until the 'clunk' when it reaches
the
'top'. Pick the combination with the closest drop time. Time should be
in the
5-7 sec. range.
If you find your sticking point, use fine sandpaper (400-600 grit?) and
lightly
remove the high spot.
>
>
> 2) As I rebuilt the carbs I had to center the jets, could poor centering
> cause the problem?
Pass this one to those more knowledgeable on needle centering, mine have
the
spring loaded needles
>
>
> One last idea... I also have a set of 69 carbs and the piston bodies are
> both stamped AUC-1331 but the needle holding area is different, one is fixed
> one has a spring. Is it possible to adapt these?
>
>
Pass...
Jeff
'70MGB
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