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Anon
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Carb and solenoids
Remembering the solenoids, and while I was doing the tappet job, I decided to fit a solenoid to my van, as it has been running with a chopped one for a long time now.
I wired a new 12V feed (the 6V feed from the coil didn't do the job last time I tried) and installed a new solenoid. It did not work. Started the engine, and it will not idle. It runs perfect with the chopped one. Then I tried a second new solenoid (in case the first one was faulty, happened before) and nothing. Still won't work.
I found these solenoids by matching them up by dimensions, at a parts store that had thousands of different ones. They work fine in my other CF, with an identical engine and carb. The other CF had a 12V feed for the solenoid, so I thought the problem might have been the 6V on mine, last time I tried it. But now with the 12V feed, this is not the case.
I got 4 of them, and they all work fine with the other CF. But with this one, it seems like the carb does not like solenoids. I also tried fitting the jet from the chopped one to a non-chopped, but this didn't work either.
Why would a solenoid that works in one Weber 34 ICT not work in another Weber 34 ICT?
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 Tue 08 Nov 2011 @ 11:22
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Anon
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Try earthing the carburettor body in case there's not a good earth via the studs.
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Tue 08 Nov 2011 @ 18:29
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Anon
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The solenoid clicks loud and clear. I already tried a jump lead on the solenoid body and the battery negative, same as without it. The problem is not on the electrical side of the solenoid, but on the mechanical side. The same solenoid works on the other carb. The chopped solenoid works on both carbs.
The carb works in mysterious ways...
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Tue 08 Nov 2011 @ 23:36
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Anon
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Maybe the taper end of the idle jet in the non-working solenoid isn't seating too well in the one carburettor body?
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Tue 08 Nov 2011 @ 23:56
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Anon
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Could be that the seating of the non working carb has been damaged thus not allowing the solenoid to have a 100% seal on its seat.
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Wed 09 Nov 2011 @ 08:06
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Anon
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Can I somehow check that? But why would it work perfect with the chopped solenoid then?
Swapping idle jets between them doesn't make any difference either. So I guess it would either be down to the seating inside the carb being damaged, or a slight difference in the casting/machining of the carb bodies? The solenoid probably is not originally for this carb, but it fits. I do wonder though whether it just happened to work with one carb but won't work on any other?
If it's not dieseling, and it's easy to start, hot and cold, is there still a risk of diluting the oil too much or damaging the cylinder walls or piston rings through gasoline washing off the oil film on them, if running it permanently with a chopped solenoid?
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Thu 10 Nov 2011 @ 11:22
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Anon
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Damaged seating inside the carburettor isn't unusual & sometimes the threads can be misaligned due to previous over-tightening of a solenoid; it won't take much damage or misalignment for leakage to occur around the seating.
Paint the taper of the idle jet with marking blue (or rub a pencil over it) then see whether contact marking is uniform around the jet after the solenoid is installed finger tight then removed. Check the chopped solenoid as well.
Fuel washing could be a problem if the van is used for lots of short trips & the engine doesn't reach normal operating temperature; otherwise any fuel that does bleed through when the engine is stopped is more likely to evaporate.
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Thu 10 Nov 2011 @ 14:36
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