Brickboarders;

The screws on the top of my dual su carbs loosen up by themselves...sometimes since the last tank fill up. I have oil (auto trans oil, as recommended in postings) in there, but what gives? Any suggestions?

Thanks!
Drivin' in the Zone!

If it is the dashpot dampers you are talking about, you could try appropriately sized neoprene o-rings (viton better) as they will "stick" a little (don't snug too much or they will "roll" out).

Mike!

DitZ *;

The fibre washer (16) should be in place and provide enough friction to prevent backing off from vibration when the (Bakelite) dashpot screw is HANDTIGHTENED only (use tools, and you will surely break the Bakelite). I find it very unusuall that Bob had success without them!

If fibre washers are not in place, threads are worn, dashpot screws are not tightened enough, or some combination of the above, this can allow vibration to back the screws away...in that case, try teflon plumbing tape or a little gasket goop of your choice on the threads to snug them up (NEVER Loktite!). Use of incorrect (too viscous) oil, AND a backfire can blow the damping mechanism pins right through the Bakelite (not so good)...but you have stated that you are using (one of) the recommended damping oils, so this cannot be the cause. Damping oil level (overfilling) is not likely to be the cause either.

Question: Does you engine have excessive vibration issues?

My recommedation: Assure your fibre washers are in place and not oil soaked, or damaged and not sitting flat, snug up the dashpot screws just a little tighter, if problem persists, use teflon tape or gasket goop on threads. Worst case replace daspot screw/damping mechanism assy.



* it seems that you picked a name, whose acronym inspires less than confidence!

Cheers

If you are talking about the dash pod screw on cap. I had the same problem, every time I would tighten them as much as possible and after a short time I would find them loose. There was a fiber washer under each cap and when I removed them I never again have had the problem.

Are you talking about the screws that hold the carb together, the screws that
hold the floatbowl lid on, or the knobs on the dashpots on top of the domes?
DO NOT use locktite on the dashpot knobs because you gotta take them out
to fill them. It could be that the threads are in bad shape, or that you
don't have the soft washer between the knob and the dome. It could even be
that the oil is so thick the pressure is pushing them out.
--
George Downs, Bartlesville, Oklahoma, Central US

Do the screws have lock washers?

or try some Locktite...
just get the one for small screws or you
will never get the carb open again
Miguel
--
My First Volvo - stock (for now) '84 244, 230+kmi. Owned it since 9/03