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Tractor Talk Discussion Forum

Ford 850 spark plugs

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Paul Ward

03-05-2005 16:06:54




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My Champion H10C plugs seem to foul way too quickly. Should I use a different plug? It has been converted to 12 volt with 12 volt Bosch coil and no ballast resistor.
New plug wires, distributor, points and condensor. Timing is good, I just checked valve lash OK.
Compression: #1 125, #2 117, #3 117, #4 127
Plug #1 not firing and looked black and wet. Plugs changed last year and should last longer than this.
Thanks,
Paul Ward

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Farmered

03-05-2005 22:30:53




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 Re: Ford 850 spark plugs in reply to Paul Ward, 03-05-2005 16:06:54  
Had the same problem with Champs in my Ford. Throw those H10 plugs in the barrel and get the equivalent in an AC plug. Once the Champs get wet with gas or oil they won't ever work right no matter how much you clean and dry them. Ed



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Bret4207

03-06-2005 04:57:28




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 Re: Ford 850 spark plugs in reply to Farmered, 03-05-2005 22:30:53  
Have the same problem with my 850. Went to the Autolite plugs and still found I had to lean the carb out some more. I'm afraid Champion is my last choice these days.



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John inWV

03-06-2005 12:23:26




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 Re: Ford 850 spark plugs in reply to Bret4207, 03-06-2005 04:57:28  
I have had this problem. My suggestion is to check your distributor. It is worn.Replace stock ignition with electronic. I use Delco AC C85 C86 C87 depending on engine condtion. Other brand plugs can be used with same heat range. Whenever you stop the engine, it usually stops at the same place every time. When the engine is cold and you pull the choke, or the float has leaked a little fuel into the air bowl of the carburator and as the gas is pulled up into the engine it has a tendacy to foul the number one plug, because the distributor is worn and the timing is off. Using high octane gasoline will help.

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John in WV

03-06-2005 12:52:26




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 Re: Ford 850 spark plugs in reply to John inWV, 03-06-2005 12:23:26  
AC Delco C85 C86 C87 are not the right heat range or thread size for a Ford ,I use these in IH-MF tractors.,Try AC C45 or hotter.Gasoline+Ignition has been my problem with plug fouling.



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steveormary

03-06-2005 12:57:16




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 Re: Ford 850 spark plugs in reply to John in WV, 03-06-2005 12:52:26  
farmered;

We used Champion D21 and put Sta-Bil in the gasoline. Plugs lasted ok.

steveormary



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