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Ford 9N, 2N & 8N Discussion Forum
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Spark Plug Sealant

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AnvilheadTX

08-29-2007 15:17:58




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Does any any use any type of sealant or thread treatment on their spark plugs? I am convinced my rough running is spark plug related and I intend to replace them this weekend - I figure since I am swapping plugs I might as well do it as right as possible.

Also, I am correct with a gap of .025 right? I purchased four new AL 147's - are these pre-gapped?




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Colin King

08-30-2007 07:32:44




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 Re: Spark Plug Sealant in reply to AnvilheadTX, 08-29-2007 15:17:58  
0.025 is the correct gap. I"ve always hand tightened my plugs on all my machines and then given them a half-turn with a wrench. I"d stay away from sealant.

Colin, MN



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Dave H

08-29-2007 16:18:22




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 Re: Spark Plug Sealant in reply to AnvilheadTX, 08-29-2007 15:17:58  
I put a smidge of antisieze on the threads.



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Bob

08-30-2007 07:03:51




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 DON'T overdo it with the anti-seize! in reply to Dave H, 08-29-2007 16:18:22  
If you use anti-seize, be sure to use a darned small "smidge".

If any gets down to the tip of the sparkplugs, and gets "blasted" onto the porcelain insulators, your new plugs will be WORTHLESS.

I have seen several instances of that happening, the last was an IHC V-8 farm truck pulled over to mys op because the engine wouldn't run. He had over-done the anti-seize, which is powdered metal and graphite, and shorted out the plugs the first time he fired it up.

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HCooke

08-29-2007 15:35:16




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 Re: Spark Plug Sealant in reply to AnvilheadTX, 08-29-2007 15:17:58  
All spark plugs come with a metal gasket. Tighten until the gasket tightens and the 1/2 turn more. No other sealant is used. I use auto lite 437 spark plus in my fords. Always check and adjust gap if necessary.



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AnvilheadTX

08-29-2007 17:55:01




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 Re: Spark Plug Sealant in reply to HCooke, 08-29-2007 15:35:16  
Oops - I meant to say 437.



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