Under the screw there is a non-metallic ring, which should prevent this.
If the ring is not present it is obvious the plunger will come loose.
If there are rings, these might turned to be too hard after all these years.
Replacement won't be an exepensive trick, but will result into a proper carb
performance.
Cheers,
Hans
'71 BGT
-----Original Message-----
From: David Councill [mailto:dcouncil@imt.net]
Sent: woensdag 26 april 2000 4:59
To: Scott McKorkle; 'MG list (E-mail)'
Subject: RE: more idiot questions - Loose plunger
At 04:20 PM 4/25/00 -0700, Scott McKorkle wrote:
>Now going off on a tangent and speaking of the carb plungers... The front
>plunger on my HS-4 keeps unscrewing. I'll drive a few days and open the
>bonnet to find it unscrewed but still in the carb. I'm assuming that
>vibration from the engine is causing this. Any ideas to keep it in place?
>I hate the thought of using loc-tite. Would teflon tape do the trick or
>cause more problems? Finally, do you think this is indicative of any more
>serious problems?
>
>Thanks!
>Scott McKorkle
>1978 MGB (converted to dual SU's)
My 67BGT had this unusual problem. After I bought it last year, I noticed
that the damper rod (plunger) would come loose on the rear HS4 carb. Even
after I tightened it as tight as I could get it, it still came unscrewed
within 5-10 miles of city driving.
I almost wrote in to the list to see if anyone had heard of this problem.
But I thought one possibility was the damper rod itself was no longer
straight, adding to the vibrations that were then unscrewing it. To test
this theory, I just swapped the dampers between my two BGTs. Well, a test
drive later, and the damper rod came unscrewed on my 71BGT.
The solution was to replace the damper rods - they were not overly
expensive, I think about $7-8 each. Its worth a try.
David
67 BGT
71 BGT
|