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Allis Chalmers Discussion Forum
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D 17 fouling plugs

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tim[in]

07-17-2007 16:37:49




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My 58 d 17 is starting to foul plugs especially 2+3 . is there a certain plug I can use until i can get it checked out or overhauled?One that wont foul so easy?Thanks in advance!




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Smith1000

07-18-2007 18:54:38




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 Re: D 17 fouling plugs in reply to tim[in], 07-17-2007 16:37:49  
I stepped up the heat range for plugs in a Farmall 300 Utility. I think it is Champion D21 that I put in it. It has worked great with the hotter plugs. It would foul 2 cylinders continuously before. I tried the extenders; didn"t have much luck. Had better luck in the short term hanging the plug wire boots back where they attach to the plug tips.

The D17 calls for a a fairly cool plug though-from what I have been told. May want to step up to the next higher heat range or maybe a little more and see how it does. May even want to just step up the ones that are foulding and leave the others alone.

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patsublett

07-18-2007 10:43:51




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 Re: D 17 fouling plugs in reply to tim[in], 07-17-2007 16:37:49  
Try the next higher heat range plug. On a Champion plug the last 2 didgets is the heat range. I have a Ferguson 40 that had been reciently overhauled. It got to the point that it would hardly run a few hours after overhaul. I finally changed the plugs and it ran fine for a few hours, started missing again, changed the plugs, ran fine for a few hours. You get the picture. Didn't use any oil. The plugs just fouled. I talked to a Champion Rep. He said "Increase the plug heat range". I went from (I believe) H-16 to an H-20. The same plugs are still in it after 3 years. Runs better than a deer.

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John (MO)

07-18-2007 08:51:56




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 Re: D 17 fouling plugs in reply to tim[in], 07-17-2007 16:37:49  
There are plug extenders that oldtimers used to move the plug a little farther out of the cylinder. I`m not sure just how well they work, but I`ve seen them on quite a few tractors over the years. A differential compression test will tell you where a cylinder is weak at. 1000% more valuable than a regular old compression test. My first guess would be valve guides. I would bet that thousands of engines have been overhauled with new rings and lots more, when actually new valve guides would have been all that were really needed.

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tim[in]

07-19-2007 10:11:12




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 Re: D 17 fouling plugs in reply to John (MO), 07-18-2007 08:51:56  
My tractor and farm are a hundred miles away. Do you think i could perform the test with the air from an portable air tank?Thanks in advance!



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John (MO)

07-19-2007 10:38:48




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 Re: D 17 fouling plugs in reply to tim[in], 07-19-2007 10:11:12  
You don`t need too much volume for each cylinder so I think you could do it with a portable tank if you have a 12 volt pump that will refill your tank to around 100 pounds. If you have a bad leak you`ll need to find where it is going pretty quick before your tank runs out of air though. What you are hoping for is a consistant drop in each cylinder. Say the cylinders will hold about 70 pounds of the 80 you put in them. That will show even wear, right down to the point the tractor just doesn`t have enough power to do what you need it to do. However if you've got 2 cylinders that are holding 70 pounds, one holding 55, and another holding 40, then you know which cylinders are problems and hopefully where the air is going. If you hear it leaking into the crank case, you've got a ring problem, if you hear it in the exhaust, then you've got an exhaust valve problem, ...the intake-the intake valve, ... the valve cover-a valve guide, and if the radiator starts bubbling... well you get the idea.

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tim[in]

07-18-2007 12:52:15




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 Re: D 17 fouling plugs in reply to John (MO), 07-18-2007 08:51:56  
By the way what is a differential compression test. Are they expensive or hard to do?Cause i'm almost thinking about sending the tractor to dealer for complete overhaul.Exspecially since i dont any buildings yet so i can work on anything without worrying about dust or weather.



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John (MO)

07-18-2007 14:17:23




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 Re: D 17 fouling plugs in reply to tim[in], 07-18-2007 12:52:15  
I think you can get a set of gauges and the plug adapter for about $50, mine is 25 years old or more and I got it at an auction.



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John (MO)

07-18-2007 14:37:14




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 Re: D 17 fouling plugs in reply to John (MO), 07-18-2007 14:17:23  

.



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tim[in]

07-18-2007 12:47:39




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 Re: D 17 fouling plugs in reply to John (MO), 07-18-2007 08:51:56  
Thanks to all. i use the extenders now. and am going to farm soon to work on it.



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John (MO)

07-18-2007 14:26:53




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 Re: D 17 fouling plugs in reply to tim[in], 07-18-2007 12:47:39  
Basically you put 80# of air pressure in a cylinder with the valves closed, and you see how much pressure leaks out. Besides seeing how much leakage you have, you can also usually hear where the leakage is going by listening to the intake, exhaust, valve cover, crank case or radiator. Also you can tell from one cylinder to another their condition much better than with just a regular old compression test. Even a poor cylinder will pump and hold some pressure if you spin it fast enough for the regular test.

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John (C-IL)

07-18-2007 04:17:23




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 Re: D 17 fouling plugs in reply to tim[in], 07-17-2007 16:37:49  
tim, I've had excellent results using Autolite 295 plugs in tractors that have a tendency to foul plugs. It seems that we just don't work the old girls hard enough any more to avoid that kind of problem.



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old

07-17-2007 21:29:39




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 Re: D 17 fouling plugs in reply to tim[in], 07-17-2007 16:37:49  
Tell us more. Are they fouled by gas or oil?? Do thye look sotty or oilie?? If they are black and dry thats fuel fouled and its running lean is its from oil they will be oilly



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