I'm going to hazard a guess that if you let the oil level get low
enough in the dashpot, the piston starts moving rapidly more rapidly
than normal in response to vacuum changes and the resultant pressure
changes inside the dashpot are higher than the the bleedhole in the cap
can vent. The result is that the cap gradually loosens because of the
too rapid pressure changes and finally unscrews. So check and top up
the dashpots more frequently! ;^)
If the dashpot oil consumption is way higher than normal then some
corrective measures are in order.
Cheers,
CR
Marc wrote:
>
> Hello -
>
> The other day, I was driving my 73 B, and it started popping. Felt like
> a little balloon popping under the accellerator. Got worse & worse, till it
> was happening 6-8 times in a row. Pulled over and checked under the hood,
> found the cap on the rear carb sticking out. Screwed it back in, and
> was on my way, no more problems. 10 - 15 minutes later, it began again.
>
> Now, it's happening very often. I inspected the threads on the cap
> and the body of the cylinder it screws in to, but they look fine.
>
> I recently topped up the carbs with 20W50 oil, not overfilled, and
> it was fine for days after that.
>
> Any ideas what could be going on here?
> --
> -----------------------------------------------------------
> Marc Siegel, ABSnet Internet Services eMail: smarc@abs.net
> Baltimore, MD http://www.abs.net voice: 410/361-8160
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