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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: D8 13A PONY TROUBLE

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Billy NY

06-12-2012 16:09:13
67.248.100.3



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Thinking about this, sounds like something is shorting, out of time or retarded, I've never used it, or fooled with it on mine, but there is a manual spark control lever which I assume is for advancing or retarding. For that fuel to detonate like that, has compression, fuel, cylinder loads up with fuel, there is a delay, then ignition or some darned thing, I've never had either of mine backfire, I would be cautious, don't want to break a piston ring or worse.

Where you are you should be able to use 85W-90, but in the winter, or cold climates, the old books said to thin it, but now one would use a different oil.

Just wondering do you have the serviceman's reference book for the tractor, there is information about the magneto and so on, might be helpful, but if not I can refer to ones I have for tractors with the same starting engine.

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Crazytractor

06-12-2012 16:17:59
67.10.84.248



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 Re: D8 13A PONY TROUBLE in reply to Billy NY, 06-12-2012 16:09:13  
I have several service books but not sure if it has all info. My concern is. If it start quick and ran great for a while Why would it be out of time? It only started backfiring after a short while of running, And the it started the backfires. Can low or empty fuel cause this too?



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Billy NY

06-13-2012 06:52:23
67.248.100.3



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 Re: D8 13A PONY TROUBLE in reply to Crazytractor, 06-12-2012 16:17:59  
Low fuel or clogged sediment bowl, carb screen, would not run or shut off. I would think something is going on in the magneto or cap like was mentioned given it was running well prior to. The first time I really fooled with one of these starting engines, I had magneto problems, one needed to be rebuilt, I found another laying about in a shed where leftover parts from another D7 starting engine, might have been a bosch, finally had the timing right and a hot magneto working correctly, fired right up, but was burning oil/smoking excessively, fouling plugs, but was running without skipping or backfiring.

I was reading in an old D7 7M book, says the crank needs to be 25 deg past TDC and is the correct firing point, thats in the servicemans reference book for the starting engine, and about the same as I described in the last post, but I would check the mag, cap and so on, could be a simple fix.

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dpendzic

06-13-2012 06:20:07
24.191.49.134



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 Re: D8 13A PONY TROUBLE in reply to Crazytractor, 06-12-2012 16:17:59  
I would check the mag cap very closely---as it heats up the cap will expand some and may have fine cracks that open up and allow a misfire.



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