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Farmall & IHC Tractors Discussion Forum
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M spark plug help

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Granger

08-16-2006 08:41:33




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I have a 51 M that has not been running very good lately. Runs fine at low idle, but at high idle it cuts out & sputters. I am going to start with chnging the plugs. It currently has Champion D18Y in it now. I have read thru the message board & see that a lot of people like the Autolite plugs. What Autolite plug number should I use? Thanks




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randy hall

08-16-2006 14:11:04




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 Re: M spark plug help in reply to Granger, 08-16-2006 08:41:33  
autolite 3116 .030 gap



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Farmer Ryan from WI

08-16-2006 10:35:42




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 Re: M spark plug help in reply to Granger, 08-16-2006 08:41:33  
The gap would be .025 for what ever spark plug you use. Either D21 or 386.



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John T

08-16-2006 09:37:29




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 Re: M spark plug help in reply to Granger, 08-16-2006 08:41:33  
Granger, in my opinion as far as reducing fouling, its the heat range thats more important then what brand of plug you use and the D 21 Champion, being hotter, would be a good choice versus cooler plugs in that brand. NOTE if you decide to go the Autolite route, I suggest the NON RESISTOR 3116 instead of either the 386 or 388 resistor plugs as on those old coil n points tractor ignitions you dont wanan use resistive carbon core suppressor wires or resistor spark plugs, but instead discharge all the energy across the spark plugs gap where it does the most good to ignite the fuel.

It also helps to use thermostats or shutters or other radiator air restrictors to get n keep the engine temperature up, dont run the carb over rich, and keep the ignition in good tune.
\ Best wishes n God Bless

John T

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Michael Soldan

08-16-2006 09:22:18




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 Re: M spark plug help in reply to Granger, 08-16-2006 08:41:33  
Granger, as much as I hate Champion plugs in cars, trucks, lawn mowers, the D21 works well in H or M applications. My old M has a set that have been in for 7 years



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Granger

08-16-2006 09:37:25




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 Re: M spark plug help in reply to Michael Soldan, 08-16-2006 09:22:18  
What gap spacing do I use on the D21?



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Bob M

08-16-2006 08:54:37




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 Re: M spark plug help in reply to Granger, 08-16-2006 08:41:33  
Granger - Despite many others' claims to the contrary I've had excellent luck with Champion D21 plugs in both my tractors (SH and SM). Previously both machines had D18's and were fouling almost every time I used the tractors.

Since switching to the D21 I've not changed a plug in 8+ years and several hundred hours of (mostly low speed) operation.

To your other question I believe the Autolite 386 is the heat equivalent to the D21.

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supermpuller

08-16-2006 08:47:57




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 Re: M spark plug help in reply to Granger, 08-16-2006 08:41:33  
autolite 386



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Farmer Ryan from WI

08-16-2006 09:25:47




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 Re: M spark plug help in reply to supermpuller, 08-16-2006 08:47:57  
Autolite 386 is what I have in my M.



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Granger

08-16-2006 09:38:29




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 Re: M spark plug help in reply to Farmer Ryan from WI, 08-16-2006 09:25:47  
What gap spacing do I use on the Autolite 386?



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