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Question on 1939 H

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Tom in Mo.

09-15-2006 19:21:24




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When I first start my H it runs perfect. Within about 2 minutes it starts to run rough and never recovers.
The carb is icing up some obviously by the condensation on the outside. Is this my problem or should I look for a intake manifold leak? How does one find a manifold leak without rmoving the manifold? Thanks for any input.




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forklift

09-15-2006 21:02:27




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 Re: Question on 1939 H in reply to Tom in Mo., 09-15-2006 19:21:24  
Yep thats a classic sign of a intake leak. First take a socket and try and give all the nuts a little tweak. Besides carb cleaner you can take a propane torch and dont light it and turn it on and point it around the intake and head and see if you hear a difference. While running of course. This is exactly what happened to my H when I was a teen I tryed everything from tune up to valve adjust. and one day a neighbor came up and said get me a socket he tightened up the nuts and she pured like a kitten.

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old

09-15-2006 19:36:47




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 Re: Question on 1939 H in reply to Tom in Mo., 09-15-2006 19:21:24  
Carb/manifold iceing is just part of life and how a carb works. So no thats not your problem. To find a manifold leak use carb cleaner, WD40 etc and spray it around the intake area, if the engine sounds differant then you have a leak but probably not your problem. Sounds more like you have a carb or fuel problem. Start by takeing the line off the carb and make sure you have a good flow of gas. If you do then pull the carb drain plug and make sure you have a good flow there. If you have a good flow in both places you have clogged jets in the carb if you don't then you have a clogged fuel line/sediment bowl or a clogged float needle or sticking float. By the way what part of Missouri are you in?

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