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Allis Chalmers Discussion Forum
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D17 series IV miss firing

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Vernell

09-28-2006 10:27:35




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I have a 67 D17 series IV, when warmed up, misses when under a light or heavy load. Tractor has about 1700 original hr. I have changed the plugs,added Heat to get rid of moisture in the gas tank, cleaned the sediment bulb, and use fresh gas. When cold motor doesn't have any problems. Not sure what to do next. Any help would be greatly appriciated.




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B W inmo

09-28-2006 17:47:53




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 Re: D17 series IV miss firing in reply to Vernell, 09-28-2006 10:27:35  
Had that to happen on a series IV ended up bad valve , had to pull head grind valves. Problem solved.



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John (MO)

09-28-2006 13:42:54




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 Re: D17 series IV miss firing in reply to Vernell, 09-28-2006 10:27:35  
Might want to check the distributor cap also



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Vernell

09-28-2006 11:27:40




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 Re: D17 series IV miss firing in reply to Vernell, 09-28-2006 10:27:35  
Thanks for the info. I'll go ahead and change both. Haven't adjusted the valves. I just bought the tractor 6 mo. ago. D0 the valves need to be adjusted every so often. And if so how often and how much. Thanks again



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old

09-28-2006 15:47:21




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 Re: D17 series IV miss firing in reply to Vernell, 09-28-2006 11:27:40  
Sounds like maybe the valve need to be adjusted. If it missed all the time I would say the disturbutor cap but if only when warmed up the valves or the coil also maybe getting weak. When you say warmed up how long are you talking about?? 10 minutes or more like and hour, if its an hour I would try a differant coil. If about 10 minutes the valve or condenser

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BCnT

09-28-2006 10:51:10




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 Re: D17 series IV miss firing in reply to Vernell, 09-28-2006 10:27:35  
could be a weak coil or condensor or both...also could be a valve set too tight if you've adjusted them lately.



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