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Distributor rotor

R

Rob in Ore

Member
This is an IH240 with 12v electronic ignition located in Western Oregon and stored in an unheated barn. I haven't used it in a few weeks but it was running ok then. Today it won't start. A quick check reveals that the contact on the rotor has virtually disolved. The distributor has a bunch of rust powder in it. There's no more than 100 hours on these parts. Why would they disintegrate so fast?
 
Moisture inside the distributor will hasten corrosion of the metal contacts. And if you are subject to salt air out there in western Oregon stuff will corrode even faster.

Also - was the "new" rotor button that rotted away perhaps made in China? Those guys are notorious for substituting dichromate finished steel (and even UNplated steel...) for corrosion-resistant brass that was used in the original ignition parts.
 
Are you sure your distributor isn't 1 tooth out, or the timing isn't off a fraction? These ignition systems can throw a big spark--which can jump a sizable gap. If your rotor isn't closely aligned to the dist. cap terminals when firing, the spark could chew up a rotor pretty quickly.
 
I got much better life out of the caps and rotors on my 140 when I changed to electronic ignition. It used to be cap or rotor would fail (always mid-winter), even if I had swapped in the Spring; now I get a few years on a set and I always get around to changing them out before they fail.

I use the same NAPA parts Charles mentioned--they are made by Echlin.
 
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