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D-14 losing power, backfires

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Jeff Steininger

08-11-2005 21:35:16




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My D-14 after running great for the last 2 yrs. has developed some real problems. Once warmed up & running hard will hesitate, stammer, backfire and eventually die. Starts up fine after cooling off, but whole process repeats. Coolant is circulating (temp gauge doesn't indicate overheating anyway- thermostat has been removed) New ignition coil. New battery, coverted to 12v Negative ground with alternator. Charges fine. New plugs & wires. What is the most likely problem I'm looking at? Valves sticking?
Any help appreciated.

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Jeff Steininger

08-21-2005 19:37:50




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 VICTORY!!! in reply to Jeff Steininger, 08-11-2005 21:35:16  
Finally. Got new plugs (just for the hell of it) new cap, points and condenser. As soon as I turned the key, I knew I had it. She hasn't run so smooth since I got her! Bush hogged for about 45 min. without a hiccup! Got lucky setting the points on the cam - ran great without even timing change. Looked like the points were pretty new anyway and not too worn. The cap and rotor were probably the main culprit. Plugs didn't look too hot either. One & 2 were pretty black.
Thanks for the advice ALL!

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Guy

08-12-2005 21:56:11




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 Re: D-14 losing power, backfires in reply to Jeff Steininger, 08-11-2005 21:35:16  
Hand the same problem with a WD45 last spring. Went through everything twice except spark plugs because they only had about 10 hours on them. Finally pulled the plugs(NGK), which looked good and replaced with autolite 303 and has been running good for about 100 hours.



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CHALMERSBOB

08-12-2005 19:32:49




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 Re: D-14 losing power, backfires in reply to Jeff Steininger, 08-11-2005 21:35:16  
DO YOU HAVE A BALLAST RESISTOR ON THE COIL? 12 VOLT INTO A 6 VOLT COIL. BOB



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Jeff Steininger

08-19-2005 12:15:19




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 Re: D-14 losing power, backfires in reply to CHALMERSBOB, 08-12-2005 19:32:49  
The coil is new 12v - says no resistor needed (internal)?



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Texas Denny

08-12-2005 17:40:41




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 Re: D-14 losing power, backfires in reply to Jeff Steininger, 08-11-2005 21:35:16  
I had something like this happen to me with a WD. It turned out to be the distributor cap. Looked good but wouldn't work at all. New cap and everything worked great again.



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Jeff Steininger

08-19-2005 12:20:16




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 Re: D-14 losing power, backfires in reply to Texas Denny, 08-12-2005 17:40:41  
Hmmm.. I opened the distributor cap today. The contacts looked pretty black. I shined them up with fine sandpaper and put it back. Guess what? NO IGNITION at all now. Will be looking for a new assembly. P.S., I see the center tab can spring contact the center electrode in the cap, but the little arm contact is supposed to just touch the copper studs in the cap just perfectly? Seems like there would have to be some kind of spring action contact at those points as well

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Too Far Gone

08-12-2005 09:09:02




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 Re: D-14 losing power, backfires in reply to Jeff Steininger, 08-11-2005 21:35:16  
Id be for replacing camshaft probably



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John T

08-12-2005 06:32:38




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 Re: D-14 losing power, backfires in reply to Jeff Steininger, 08-11-2005 21:35:16  
Jeff, one possibilty of an engine cutting out AFTER WARM UP and if its ignition versus engine related, is the condensor or coil. How long since the condensor was replaced??? Does the coil feel warm (as it should) or so hot after a warm up you can barely lay your hand on it??? Points that are gray oxide coated or carboned up or burned can be another possibility as their resistance increases with heat, check n maybe non abrasively clean/buff/polish them (but replace if badly burned) and re gap n try her.

I agree with Kent that if you changed polarity try reversing the coil leads n see how it does. A coil in reverse polarity can still fire but its not as efficient and can loose more energy to heat.

As far as fuel related possibilities, are you sure either the gas tank or the gas cap is properly vented which allows air to enter as gas flows out, maybe shes air locking????? Try it with the cap removed n see what happens???

You might remove the fuel line where it enters the carb to insue a good strong continuous gas flow the size of the lines ID in case theres a restriction in any tank outlet or sediment bowl etc.

John T, retired electrical engineer in Indiana who usually lurks on the Mother Deere board instead of over here on the dark side lol

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Jeff Steininger

08-19-2005 12:28:34




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 Re: D-14 losing power, backfires in reply to John T, 08-12-2005 06:32:38  
p.s.
see response to Texas Denny.

Also - condenser? Where is it? The new coil said it didn't need a resistor though.



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Jeff Steininger

08-12-2005 06:38:54




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 Re: D-14 losing power, backfires in reply to John T, 08-12-2005 06:32:38  
Hmmm... I don't think I did! Will have to try that - also fuel thing. Thanks both, will let you know.



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Kent of SW MO

08-12-2005 06:01:24




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 Re: D-14 losing power, backfires in reply to Jeff Steininger, 08-11-2005 21:35:16  
When you changed to 12 volt negative ground did you change the coils polarity, i.e. connect the negative side of the coil to the points.

Kent



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Jeff Steininger

08-18-2005 21:31:06




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 Re: D-14 losing power, backfires in reply to Kent of SW MO, 08-12-2005 06:01:24  
Turns out I did. - change neg. side to the points. I reversed them just for the heck of it and yes it ran worse yet. Gas cap is not causing a vacuum. Dies just as fast with it off...



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