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A Spark Plug Puzzle? Clooney-Anyone?

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Wayne in Tn.

02-04-2003 16:56:46




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I know we have discussed plug fouling in the Dubuques many times. But I found a first for me today. I brought in a 420 that was smoking bad from the exaust and blowby also. But it ran pretty good. I started tearing it down for an overhaul, pulled the head, pistons are very loose in the cylinders, rings must be all broken. Have not removed them yet. No ring groove in cylinder wall. Lots of black soot on top of pistons and head compression chambers. Pulled the plugs out and here is what was in it: Champion RN12YC with a VERY long reach, the threads measure 3/4 inch. What are these things for? Why did it run fair and not miss considering all the rings are gone? I know Clooney prefers 2 gaskets under the plugs to help fouling, but these things went 3/4 inch into the head. I would have thought the piston would have hit them, but they didn't. Does this mean these plugs would be better for all Dubuques with a fouling problem?

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Verle Blazek

02-08-2003 00:23:35




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 Re: A Spark Plug Puzzle? Clooney-Anyone? in reply to Wayne in Tn., 02-04-2003 16:56:46  
Consider paying more for a high-temp range platinum electrode plug. Platinum does not make chemical bonds easily (won't corrode), and it has a high melting point. For both these reasons they are made with a very fine electrode filament. The electrode heats up faster, burns carbon or excess fuel off their tip more quickly... I have actually noticed the difference in the idle of a worn engine with Platinum v. conventional plugs.

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Henry J

02-05-2003 06:06:30




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 Re: A Spark Plug Puzzle? Clooney-Anyone? in reply to Wayne in Tn., 02-04-2003 16:56:46  
Wayne

That sounds like the condition my 420 block was in. The neighbor could see the smoke signals it made. Anyway, I had no idea if anything inside the tractor worked so I just ringed (everything in the head was replaced also) it to get it going so I could work the thing while repairing it. Rings stopped the smoke out the exhaust, but she sure does smoke out the breather. However it runs well and does not foul plugs.

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John T

02-04-2003 17:55:42




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 Re: A Spark Plug Puzzle? Clooney-Anyone? in reply to Wayne in Tn., 02-04-2003 16:56:46  
Hey Wayne, even though those plugs didnt foul too bad, I got to agree with Clooney and wouldnt recommend running a plug whose threads ran far past the threaded area into teh combustion chamber. Yes, the plug needs to run hot enough to burn off and prevent residue build up, but the old extra gasket trick or others can make her hotter without having its threads go that deep. If hot range plugs are used and the ignition is in good shape and the tractor ran at temperatures as designed for, that alone helps prevent premature plug fouling. Take care n Good Luck, Ol John T

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Clooney

02-04-2003 17:22:49




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 Re: A Spark Plug Puzzle? Clooney-Anyone? in reply to Wayne in Tn., 02-04-2003 16:56:46  
Wayne, those plugs are used in some Harley Davidson motorcycles & other equipment . They are a good anti-fouling plug & would probably not foul under most conditions. The problem with using them in a 40-430 is they do stick into the combustion chamber a long ways, will be close to the piston & will have exposed threads in the combustion chamber. Exposed threads in the combustion chamber will glow red hot & could cause pre-ignition under load. The other problem is the exposed threads carbon up & tend to tear the head threads up when removed. I suppose if you have a real oil burner & need to keep it running they would work.

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Wayne in Tn.

02-04-2003 17:50:34




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 Re: Re: A Spark Plug Puzzle? Clooney-Anyone? in reply to Clooney, 02-04-2003 17:22:49  
I guess that is why they were in there, I had never seen that number before. Yes, I noticed they did not want to come out, but with the head off, I just soaked them good with PB Blaster, and managed to work them out. I can see where it would be a pain to have to pull the head off every time you wanted to remove the plugs....Hopefully after the rebuild, I won't need them.lol



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Clooney

02-04-2003 18:09:49




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 Re: Re: Re: A Spark Plug Puzzle? Clooney-Anyone? in reply to Wayne in Tn., 02-04-2003 17:50:34  
Wayne, I just have to ask? With those Harley plugs in there did you get the urge to kick start it?



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Wayne in Tn.

02-05-2003 06:42:41




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 Re: Re: Re: Re: A Spark Plug Puzzle? Clooney-Anyone? in reply to Clooney, 02-04-2003 18:09:49  
Clooney, when I saw the condition the pistons were in,,I had the urge to Kick the tractor..lol



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John T

02-05-2003 07:17:10




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 Re: Re: Re: Re: Re: A Spark Plug Puzzle? Clooney-Anyone? in reply to Wayne in Tn., 02-05-2003 06:42:41  
Hey Wayne, you know the Harleys and 2 Cylinder Deeres do have some in common, being 2 cylinder and 4 cycle, however, its those 2 cylinders at that V angle on a crank throw which give the Harleys their distinctive sound of "Potato Potato Potato Potato" at idle which I truly love to hear. Dont kick it tooooo o hard, they can hurt you back lol. Ol John T



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Wayne in Tn. to John T.

02-05-2003 09:10:57




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 Re: Re: Re: Re: Re: Re: A Spark Plug Puzzle? Clooney-Anyone? in reply to John T, 02-05-2003 07:17:10  
Yeah, John T. guess that is why I am addicted to the 2 cyl, Deeres. I was practcally raised up on a Harley. I had my first small one a 125cc at age 11 then at age 13 had my first full sized hog, it had the gear shift beside the tank and the suicide clutch. I was not big enough to crank it, had to get my buddies to crank it for me, but after it was started, I could give her He**.



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