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TO20 Temp Sensor

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Stan/TX

01-01-2008 20:51:49




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I touched it 1 too many times - the tube broke off from the sensor. It is the original. The parts manual I have does not have anything about these parts - temp gauge, tube, sensor, fitting. The only reference is to a plug 5/8" NF spec. There are no parts listed on YT. I did find some parts on the ssb tractor site - just not sure which one is the right one.
Thanks for any suggestions.

Can the sensor/tube connection be repaired??

Have a Happy & Safe New Year!!

Stan in Texas

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Stan/TX

01-03-2008 17:02:20




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 Re: TO20 Temp Sensor in reply to Stan/TX, 01-01-2008 20:51:49  
Got the new ignition wires cut, assembled, and installed. Checked the voltage on both sides of the coil. Just like you said 6V on the battery side and 0V on the distributor side. Checked the new coil wire to the distributor - I have never seen the BIG FAT BLUISH-WHITE spark until today. I just thought I had sparks before. WOW!! What a difference that makes.

I backed it out of the garage and drove it around the driveway a few times and then headed off down the road. Put it through all the gears back and forth - no misses, pops, or backfires. I am ready to put the mower on and try it out. I have to be really careful-we have a burn ban in force and just a spark from the exhaust or the mower blade is enough to set it all up in flames.

I am beginning to think my TO20 something of a hybrid. The wiring matches the TO30 wiring diagram exactly. The governor is from the TO30. The ignition switch is a 3 point switch with a real key and it has always had 3 gauges. The plate says TO20 and the SN indicates a 1950 model. The only thing I can figure is some owner liked what the TO30 had and made the changes. Oh yeah - also only have 2 brushes on the Delco-Remy generator - no place to put a 3rd one.

Thanks for all the advise, info and encouragement.

Stan in dry north central Texas

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Jerry/MT

01-03-2008 17:20:44




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 Re: TO20 Temp Sensor in reply to Stan/TX, 01-03-2008 17:02:20  
Glad you sorted out the problem. Thanks for reporting back on what you found.



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Stan/TX

01-02-2008 15:49:56




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 Re: TO20 Temp Sensor in reply to Stan/TX, 01-01-2008 20:51:49  
Jerry,

It is a 6V+ ground system all the way through. Everything is wired correctly. I think you hit it when you said, "Are they cooper core? They need to be for 6v especially." I have that other kind.
I just got the temp gauge assembly installed - cranked it up and it sounds great. All those things you need to do with the ignition wiring do make a difference. I will get a set of copper wires tomorrow and see what that does.
Thanks for the info - I'll let you know how it works.

Stan

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Stan/TX

01-01-2008 22:23:05




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 Re: TO20 Temp Sensor in reply to Stan/TX, 01-01-2008 20:51:49  
Jerry,

Thanks for the information.

I am finally putting my engine back together and it runs - better than it ever has. In checking out the ignition system I am getting a big fat spark from the coil. Some of the time it is blue-white, the rest (most) it has an orange color. I know the generator/VR system is working correctly and all grounds are bright and shiny. I have checked to make sure the spark plugs are firing when they should - same color as the coil spark. The coil is just a regular 6V coil about 8-10 years old. The distributor is new. It starts easy and runs good. Just seems to be missing on a cylinder ever now and then. I have cleaned the ignition wires and positioned them so they are not touching at all. I have made sure the timing, advance, and rpms are at specs.
What do you suggest I do to correct the spark? Would one of the high performance 6V coils make any difference?

Stan in Texas

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Jerry/MT

01-02-2008 09:46:20




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 Re: TO20 Temp Sensor in reply to Stan/TX, 01-01-2008 22:23:05  
Make sure that your points are set correctly and are not pitted, burned or corroded. Make sure that you have the correct coil polarity. Your OEM 6V system is a positive ground. Make sure that the small wire from the coil to the distributor is connected to the (+) terminal on the coil. Make sure that you have a 6V coil. You don"t need a resistor with a 6 V coil and if by chance you have a true 12V coil, then you have too much primary reistance. Make sure you have a good distributor cap with no corrosion in the terminal sockets and also check the high tension socket on the coil tower for corrosion.
I don"t know what a "high performance" 6V coil is. It sounds like marketing to me.

Something is causing your weak spark and you"ll have to troube shoot it. I suspect it"s in the primary circuit but it could be your wires. Are they cooper core? They need to be for 6v especially. Pull the center wire from the distributor cap and hold it near a good round. Try a start. What does that spark look like? If it"s the requisite FAT, BLUISH-WHITE SPARK, then I"d suspect the plug wires.
Check the voltage at both sides of the coil with the points closed. It should be near battery on the ignition switch side and near zero at the distributor side. Hope this helps.

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mark from the fort

01-02-2008 08:32:50




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 Re: TO20 Temp Sensor in reply to Stan/TX, 01-01-2008 22:23:05  
I assume you are running a 6 volt, pos. ground system?
If not, you will need a resistor so as to not burn up that 6 volt coil.
Just checking. Mark



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Jerry/MT

01-01-2008 21:32:46




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 Re: TO20 Temp Sensor in reply to Stan/TX, 01-01-2008 20:51:49  
You can usually find a new unit at places that sell tractor parts and they are about $15 -$20. I understand there is a method to repair them (See the Restoration Forum) but since they can be easily found, unless you are a die hard fix it guy, a replacement is the easiest way to go.



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