Tom Fall Posted July 26, 2011 Share Posted July 26, 2011 Right, bit of back story first. When I first got my SIII we rejetted and reset the original carb back to factory settings. It was an original Zenith 36IV. Had no problems with it, float levels stayed good etc until the carb eventually warped, which I understand is a common problem. So bought a brand new carb from a reputable vendor. This is where the fun begins. So I've had the carb on there for about 2 years now. In that time I've had to reset the float levels numerous times. They go out for no particular reason, at no particular time...and not by a small amount. I'm talking 8mm+ out of adjustment in the space of two days with the vehicle not moving?! So, I've got quite used to that. Now though, I've got a new problem to add to it. I've just adjusted the float levels, and they're perfect. But still, the engine overfuels...to the point I have black smoke pouring out the back and I can smell it in the car. All the jets are clear, everything appears to be working properly. I've adjusted idle mixture and idle speed, all correct. The ignition is electronic, and the car runs perfectly on LPG so I don't think it's an ignition related fault either. All I can think of is the O ring that seals the two halves of the carb together and stops the float chamber emptying into the intake manifold? Does anyone else have any ideas? Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 26, 2011 Share Posted July 26, 2011 I've had the o-ring leaking on a new Zenith before, I cured it with some silicon sealant around where the ring sits -no problems since, touch wood. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted July 26, 2011 Share Posted July 26, 2011 I've done the same repair as Bowie and it works well. Les. Quote Link to comment Share on other sites More sharing options...
the real muddy90 Posted July 26, 2011 Share Posted July 26, 2011 I'm very suprised that silicon works, I would have thought that the petrol disolves it!? Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 26, 2011 Share Posted July 26, 2011 Silicon sealant is both fuel and oil safe and not degraded by either. Quote Link to comment Share on other sites More sharing options...
lexi Posted August 29, 2011 Share Posted August 29, 2011 Silicon sealant is both fuel and oil safe and not degraded by either. Remarkably heat resistant as well. Quote Link to comment Share on other sites More sharing options...
Mr Bean Posted September 3, 2011 Share Posted September 3, 2011 Or buy a Webber? Quote Link to comment Share on other sites More sharing options...
Mr Bean Posted September 3, 2011 Share Posted September 3, 2011 Where did you buy the Zenith from? Quote Link to comment Share on other sites More sharing options...
Tom Fall Posted September 3, 2011 Author Share Posted September 3, 2011 From memory the Zenith was from Paddocks. Quote Link to comment Share on other sites More sharing options...
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