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AC
:

B Keeps Surging

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Sarah-Jane

08-20-2002 02:00:48




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I have a 1947 AC - B which starts well and runs well whilst ticking over. But on fast idle or when actually being driven off the engine surges (hunts) intermittently. Can anyone advise why this happens and how I can stop it.

Thanks,




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Greg Ballantyne

08-21-2002 18:59:42




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 Re: AC - B Keeps Surging in reply to Sarah-Jane, 08-20-2002 02:00:48  
I had the same problem, mine wasn't the spring or the governor. My problem was solved by a carb rebuild.



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Kiwi Pete

08-20-2002 20:42:35




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 Re: AC - B Keeps Surging in reply to Sarah-Jane, 08-20-2002 02:00:48  
re the spring Sarah! I had a similar problem and needed a spring - so i just ripped a bic pen to pieces and used the spring from that.
If it is not the spring it may be the carb adjustment and if you have one of the old manuals it will give you the settings - I have them if you need them just not here at work...
I have just finished restoring a 1948B and its awesome!
regards
Peter Rumble
Tirau New Zealand

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Rod (NH)

08-20-2002 13:54:09




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 Re: AC - B Keeps Surging in reply to Sarah-Jane, 08-20-2002 02:00:48  
Hi Sarah-Jane,

One thing you might check is to verify that you have the spring in the carburetor linkage between the carb and the governor. This is a fairly weak spring that connects to the linkage rod about one inch forward of the joint between the rod and the carburetor throttle lever. The other end of the spring is connected to a fixed point up behind the intake/exhaust manifold. It could be broken or missing. I understand the purpose is to prevent surging but I have never tried running my '42 B without it so I don't know for sure.

"whilst ticking over"? Interesting phrase that I haven't heard before. Are you in the UK?

Rod

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JMS/MN

08-20-2002 13:52:39




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 Re: AC - B Keeps Surging in reply to Sarah-Jane, 08-20-2002 02:00:48  
WD45 had a spring on the throttle rod, left side of engine, in front of carb, going to draincock on block, to control surging. I think the B/C might have as well. Just tempers the motion of the rod going to the carb.



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