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Allis Chalmers Discussion Forum

D 14 slight backfiring

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Raymond in co

09-25-2009 19:27:22

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I have a d14 that I think is backfiring slightly. I just rebuilt the carb to correct it but it didn"t help. It does it throughout the entire rpm range. It takes several seconds to do it ( like 5 or 6 seconds and then it pops a little through the carb. Any Idea what that could be?

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Brian Jasper co. Ia

09-27-2009 14:27:37

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 Re: D 14 slight backfiring in reply to Raymond in co, 09-25-2009 19:27:22  
Is the distributor shaft tight? Excessive wear in the bushing causes the shaft to flop around and change the timing.

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Raymond in co

09-29-2009 18:31:45

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 Re: D 14 slight backfiring in reply to Brian Jasper co. Ia, 09-27-2009 14:27:37  
I timed it. It was ok. I ended up looking at valve timing and found a rocker arm adjustment screw fell out, so the valve was floating. I adjusted all the valves, rechecked timing and now it runs nicely.

Thank you for all your help.

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09-26-2009 19:33:17

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 Re: D 14 slight backfiring in reply to Raymond in co, 09-25-2009 19:27:22  
Might be too lean.

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09-26-2009 03:43:49

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 Re: D 14 slight backfiring in reply to Raymond in co, 09-25-2009 19:27:22  
Check timing and points gap... replace points and condensor if time

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