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Harry Ferguson Tractors Discussion Forum
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Help figuring correct plugs for TO-20

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mose1974

05-03-2007 09:00:19




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Hello all I am looking at other posts and am now confused on what spark plug works the best for a TO-20. Champion's website says to use a 502 plug then Champion says to use a 555 plug for Heavy PTO use. People on this site are saying to use either an Autolite 386 or 3116. Further looking Autolite 386 cross references to a Champion 516(D16)type plug. I am looking for some clarification on the correct plugs because my TO runs great until I go too mow and then it sputters. Any helpful information would be greatly appreciated.

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Jerry/MT

05-03-2007 20:04:27




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 Re: Help figuring correct plugs for TO-20 in reply to mose1974, 05-03-2007 09:00:19  
Gshadel has given you some good advice. Most "sputtering" problems are due to poor primary ignition system performance. One thing he didn't mention is to make sure that your coil polarity is correct. The wire from the coil to the distributor should be connected to the coil terminal that has the same sign as the battery ground. That means if you have a positive ground, you'll need to have the coil wire to the distributor connected to the (+) on the coil.

The other thing is to check the distributor shaft/bushings for wear. Get the points closed by cranking the engine he push the shaft fron the side and watch the points. You should see no motion in the points. If you have a dial gauge, the acceptable runout is lie 0.002". A lot of the distributors are more than 50 years old and hardly anybody fills the little oil reservior on them with oil.
As far as plugs are concerned, any of the recommended ones will work IF YOU HAVE A FAT BLUISH-WHITE SPARK!

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pojo

05-04-2007 05:07:19




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 Re: Help figuring correct plugs for TO-20 in reply to Jerry/MT, 05-03-2007 20:04:27  
Jerry/MT This is what is so great about this site, you learn something every day. In the above post, what "little oil reservior" on the distributor are you refering to?



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Jerry/MT

05-04-2007 11:08:17




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 Re: Help figuring correct plugs for TO-20 in reply to pojo, 05-04-2007 05:07:19  
If you look on the side of the Delco distributor, there os a little plug with a screw slot(part no. 1 750 378 M1) in it. It supposed to be checked every 750 hrs and is to be kept full of 20W oil. I think any oil would be fine. It's probably the most neglected maintenance item (next to the air cleaner)on the tractor.



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Lance J.

05-03-2007 14:09:31




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 Re: Help figuring correct plugs for TO-20 in reply to mose1974, 05-03-2007 09:00:19  
It seems that your problem is similar to what I'm having. Lots of people gave me good advice on checking for ignition problems when I made a similar post 2 days ago. Look under "spark plug problems, maybe..." from 5-1-07. Also, John(UK) sent me a handy tune-up specs chart for all TO series tractors. I'll try to e-mail it to you.



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gshadel

05-03-2007 13:02:26




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 Re: Help figuring correct plugs for TO-20 in reply to mose1974, 05-03-2007 09:00:19  
D16's & 386's are the common plugs usually referenced here. Plug gap is .025"
The situation you describe is a typical symptom of a weak spark. Pull a plug and check your spark, you should have a "fat bluish-white spark" to quote one of the other guys. A weaker yellow/orange spark is no good. Make sure your using copper core ignition wires, no graphite core types. Check your point gap, it should be .020 - .022". A narrow gap robs your spark. Make sure your 6V connections to the coil, ignition switch, and distributor are clean & shiny. 6V systems are intolerant to corrosion.
If your spark checks out, you may...may need to adjust the governor set screw in on the front engine cover, or adjust the power mixture screw (big adjust screw) on the carb. But chances are good that spark is your problem.

George

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mose1974

05-03-2007 13:08:59




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 Re: Help figuring correct plugs for TO-20 in reply to gshadel, 05-03-2007 13:02:26  
Thank you for the input I will try the Autolite 386 plugs, I currently use the Champion 502.



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