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Farmall & IHC Tractors Discussion Forum
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MTA rotor cap

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Bellyacre

03-31-2006 17:05:43




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Converted my MTA to 12 volt years ago and last fall put in electronic ignition. Today I noticed the cap and rotor are burned quite bad. Will the resistor go bad and cause that? Any ideas would be appreciated. THANKS




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Brownie 45

04-01-2006 04:55:05




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 Re: MTA rotor cap in reply to Bellyacre, 03-31-2006 17:05:43  
Is the timing set correctly? Sounds like The spark is having to jump too large of a gap between the rotor & the distributor cap terminals. With installation of the electronic ign., the increased voltage is capable of eroding & burning the bakelite & contacts in the cap. Could possibly be such a thing as the timing gears being 1 tooth off. Check by setting front pulley at timing pointer & see where the rotor points in the distributor cap.

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Bellyacre

03-31-2006 17:41:09




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 Re: MTA rotor cap in reply to Bellyacre, 03-31-2006 17:05:43  
It's burning the plastic at the base of the treminals in the cap and about 1/16" gone from side of rotor contact



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Bob M

03-31-2006 19:50:23




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 Re: MTA rotor cap in reply to Bellyacre, 03-31-2006 17:41:09  
A bad (or shorted) resistor won't cause that. Rather the likely prospects are oil contamination inside the cap, or poorly-made replacement parts - eg. parts from China or India.



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Bob

03-31-2006 17:29:19




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 Re: MTA rotor cap in reply to Bellyacre, 03-31-2006 17:05:43  
If the coil is not running excessively hot, the resistor is OK.

Are the cap and rotor burning at the center post (carbon brush), or at the individual internal posts that lead out to each spark plug wire nipple?

If the burning is at the individual terminals, it sounds like normal wear and tear.



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