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John Deere Tractors Discussion Forum
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SPARK PLUG TOO SHORT FOR G POWER BLOCK

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Ben.So.Tex.

08-23-2006 11:05:44




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I have the head off my G and I notice that the plugs are recessed back in the plug hole about 3/4 inch.
I installed a D15Y champion in their, and still about a 1/2 inch short. I need a plug with a longer tip I think so that it can fire closer to the cylinder. (This is a G with a Power Block.




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Oppy

08-23-2006 13:37:58




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 Re: SPARK PLUG TOO SHORT FOR G POWER BLOCK in reply to Ben.So.Tex., 08-23-2006 11:05:44  
Ben,

I'm not sure about your powerblock and it's exact needs but we've been running Autolite 386s and 388s with no problems. You'll find on this forum that Champion plugs don't have a great reputation.

P.S. Did you get the new pulling schedule in the mail?

John



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Ben.So.Tex.

08-23-2006 18:26:22




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 Re: SPARK PLUG TOO SHORT FOR G POWER BLOCK in reply to Oppy, 08-23-2006 13:37:58  
I was still fouling both of them plugs out. the 386 and D21
I am hoping Glen TX will reply with something with a longer electro.

Yep got the sechdule, Tractors won't have time to cool off with all the dates for pulling. Now their is one in New Braunfel after Medina the next weekend..Just for heads up..
Hope your G is ready, and mine also



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Glen in TX

08-24-2006 10:10:58




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 Re: SPARK PLUG TOO SHORT FOR G POWER BLOCK in reply to Ben.So.Tex., 08-23-2006 18:26:22  
Ben, The Champion D18Y and Autolite 3116 are going to be a hotter plug than that D15Y and will have the extended tip also but still just have the 1/2" thread reach. We never stocked or ran them in anything here but there were some 18mm industrial plugs made with a extended electrode. Industrial plug Champion D89D / stock no. 543 shows to be 18mm with a 1/2" thread reach but longer side wire tip and list price about $15 each. Looks longer than the D18Y in catalog but doesn't say how much and I don't have any here to compare them to. AC 18A shows to cross to the Champion D89D and not sure if Autolite had a cross. Another Champion industrial plug is a B86N / stock no. 542 with 13/16" thread reach and 4 electrodes around center tip not extending like others and listed for about $48 each. Those would all be special order around here but if any oil field supply places in your area you might check with them for plugs like that. You could also run thread adapters and run a longer hotter 14mm plug. I'm not finding a Denso cross to those yet. I have some Denso L14-U non resistor U groove electrode plugs if you would want to try those. They are comparable in heat range to the D21 or D23 plugs and replace all the Champion numbers from D16 to D23 but don't have the extended tip.

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