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JD D engine problem HELP

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John Cunningham

04-26-2003 20:01:22




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I just started a D after many years of sleep. The engine will throttle up with both cyllinders hitting well then all of a sudden both cut out followed by one or more large back fires. The engine will spin down then start firing evenly again and the whole thing starts all over. The carb has been professionally rebuilt and I checked the timing. I have adjusted both the mag and fuel jet positions with the engine running. Helps just a little. The fuel line feeding the carb has been bent and is a little narrowed. Is it starving for fuel or what?????

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Clooney

04-27-2003 04:26:30




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 Re: JD D engine problem HELP in reply to John Cunningham, 04-26-2003 20:01:22  
John, it does sound like fuel but could also be mag [ignition] induced.
~Do the fuel flow test indicated below, if it passes that look for water in the air cleaner oil cup.
~Those old D's have a tendency to warp the exhaust manifold at the cylinder head area so see if smoke & fire comes out of the manifold to head joint. ~You could also have an ignition problem, install a new set of spark plugs just to eliminate that as the cause [it's possible that's all it is].
~To help you on the ignition side you will have to tell us what year D, what model mag it has, & if it an early D if still has the manual spark advance operational...

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Bob-Wyo

04-26-2003 20:50:24




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 Re: JD D engine problem HELP in reply to John Cunningham, 04-26-2003 20:01:22  
John Do Clooney's fuel flow test first. Open drain valve on carb, then turn on gas and see if you are getting a pencil size stream of gas out the drain valve. This will let us know if fuel is getting to the carb. If not work back towards the tank. If so then close drain valve with gas on for a min, then open drain valve, this might check for float sticking shut or slow opening. Did the rebuilder clean out all the passage ways and not just soak it? Sure sounds like it's leaning out on fuel, but could be a mag problem, if it is, Clooney and John T will steer you right.
Not much help, but will give you some things to check and post back.
Bob-Wyo

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John T

04-26-2003 21:40:47




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 Re: Re: JD D engine problem HELP in reply to Bob-Wyo, 04-26-2003 20:50:24  
Im not much of a D man. However, it sort of sounds more to me like a fuel starvation than a mag problem also. Hes got to have a good full ID line size gas flow to the carb out the tank and sediment bowl and then the good pencil size continuous stream out the carb bowls bottom to insure a good open needle and seat and strainer. A loose choke butterfly flopping around could cause a problem. Does it black smoke when this happens, or just cut out. John T

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John Cunningham

04-27-2003 09:25:21




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 Re: Re: Re: JD D engine problem HELP in reply to John T, 04-26-2003 21:40:47  
Thanks for the great responces!!!
This is a 1946 D serial 166,000. The carb went to Robert's carb repair in Spencer Iowa. Everything was done to it and was run on a test engine. I do not think the mag is original. Looks rebuilt and it is not a Wico. It may be a Fairbanks can't tell but it has a hot spark. I did ajust the mag with engine running all the way back and forth. This did appear to lessen or even remove the backfire. I have been running with the air cleaner oil bath pan off. I was cleaning it out and just have not put it back on.
When running good there is no black smoke it just cuts out. I will check out the fuel flow as suggested. Thanks again. It is refreshing to get a little help when you've worked hard and not end with the best results.

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John Cunningham

04-29-2003 05:26:36




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 Re: Re: Re: Re: JD D engine problem HELP in reply to John Cunningham, 04-27-2003 09:25:21  
I performed the flow test through the carb bowl drain and it failed. The flow looked good at the start then went to a trickle. I think the narrowed gas line is causing my problem. I will replace it and see how she goes. Thanks guys.



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