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Ford Tractors Discussion Forum
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Plug goop and resistor coils

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Bob Jarvis

11-18-2007 19:30:40




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I was doing some work on my Ford 3000 and when I pulled the old plug wires I found some clear petroleum jelly-like stuff on the old wires. What is this stuff? The last set of wires was put on by the local NH dealer when I sent my then-recently-acquired tractor to them a few years ago for a going over. Is it in fact petroleum jelly? I'm guessing it's there to keep the wires from corroding to the plugs - is this right? If it's not petroleum jelly, what is it and where can I get some?

Second question: I was reading somewhere about coils, and encountered the term 'resistor coil'. What is this? I thought that what I'd read said that a resistor coil doesn't require a condenser in the distributor, and given the *#&^@)! I had to go through to get the blasted condenser out today (the screw holding the condenser down had been put in by Godzilla) I'd be happy to have one fewer thing crowding up the distributor.

Thanks,
Bob

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soundguy

11-20-2007 13:20:27




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 Re: Plug goop and resistor coils in reply to Bob Jarvis, 11-18-2007 19:30:40  
Ditto ont he info fromthe others.

Goop is dielectric grease probably.. and YOU NEED the condensor.. otherwise you will get good at changing points.. say.. every 5 minutes?

Soundguy



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Jerry/MT

11-19-2007 08:27:51




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 Re: Plug goop and resistor coils in reply to Bob Jarvis, 11-18-2007 19:30:40  
Most primary ignition circuits run with about 4 amps of current whether thay are 6v systems or 12v sytems. In order to keep most ignition coils from overheating when running them in a 12 V system required an external resistor(~3 ohms) in the primary circuit to limit the current to that value. Later the reistance was built into the 12V coil so no external resistance was required. However, just to make matters confusing, 6 V coils are marketed as 12V coils with a note that they be "used with an external resistor".They will work well if you use the external resistor.

Sometime a special type resistor with what is called a "positive temperature coeficient resistor" is used. At start up, when the resistor"s temperature is at ambient temperature, the resistance is signicantly lower than 3 ohms. This provides a hot spark at start up. As the current causes the temperature of the resistor to increase, the resitance increases and the current is reduced to ~ 4 amps and the coil does not overheat.

For 12V systems, the NAPA IC-14SB (~$15) is a true 12 V coil that requires no external resistor.

The condensor serves an entirely different purpoe and is not eliminated when a resistor is used in the primary circuit.

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awhtx

11-18-2007 20:03:52




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 Re: Plug goop and resistor coils in reply to Bob Jarvis, 11-18-2007 19:30:40  
A resistor coil has the resistor built in so an external resistor is not required. A coil that operates on 12 volts continuously won't last long so either an external resistor (often seen on Chrysler cars as a ceramic block) or the internal type must be used. Unfortunately you still have to have a condensor with either coil but the screw doesn't need to be torqued by godzilla.



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JR in nwmo

11-18-2007 19:40:26




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 Re: Plug goop and resistor coils in reply to Bob Jarvis, 11-18-2007 19:30:40  
Its dielectric grease Nonconducting insulator parts stores.



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Jim in NY

11-18-2007 19:40:26




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 Re: Plug goop and resistor coils in reply to Bob Jarvis, 11-18-2007 19:30:40  
The goop is more likely than not DI-Electric grease -- works great especially when you want to remove the plug wire(s) and boots as they come off/out easy... If someone was to put petroleum grease on the insides of the boots it is not a good substitute for the DI-Electric grease which is designed for the job.



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