Broken ignition rotor - Ford Mustang Forum
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post #1 of 14 (permalink) Old 09-26-2019 Thread Starter
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Broken ignition rotor

I was trying to start the car after sitting for years and found the rotor was broken. I put a new one in and made sure it was seated properly but it broke again! Any ideas?

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post #2 of 14 (permalink) Old 09-26-2019
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many of the replacement rotors are not molded correctly and the "stop" inside the rotor shaft mount sets the rotor too high causing it to it the edges of the cap...the other issue is if it fits the shaft loose, it will float up and do the same thing


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post #3 of 14 (permalink) Old 09-26-2019
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If the car was running before it was parked/stored, it could just have been an old rotor. I'd check the cap for broken contacts inside then make sure a new rotor is seated properly on the shaft. The second rotor damage could have also been from the cap being re-installed a little off center.
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post #4 of 14 (permalink) Old 09-28-2019 Thread Starter
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Thanks I'll try that
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post #5 of 14 (permalink) Old 09-28-2019 Thread Starter
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Beechkid...how do you go about finding a good rotor
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post #6 of 14 (permalink) Old 09-29-2019
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You can get a new rotor at any parts store.

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post #7 of 14 (permalink) Old 09-29-2019 Thread Starter
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I know that but beechkid said reproduction ones aren't always that great.
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post #8 of 14 (permalink) Old 09-29-2019
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Go to the auto parts store and get a name brand one like standard ignition brand products. Make sure its pushed all the way down when you install it.

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post #9 of 14 (permalink) Old 09-30-2019
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Ninety nine percent of the time you'll get a "good" rotor from a parts store. I'd pick one with a medium price range. Or, if you're super concerned, buy one from your local Ford dealer. Being a retired professional mechanic for over 50 years I can count the number of bad rotors I've bought/installed (via my employer) on half of one hand. And that covers the gamut from the cheapest to the most expensive.
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Quote:
Originally Posted by White65 View Post
Beechkid...how do you go about finding a good rotor
Well, the rotor and cap must be made by the same mfg (IMHO)….Ford racing use to make them (it's been a few years since I last looked)….but I am also a fan of Blue-Streak which has been around for many decades as well. Both of these use to have thicker walls for stability/strength and fit very snug. IIRR, I did have to take a Dremel to the inside of the rotor and grind down about 1/32" as compared to the mock up measurements I took back when. Hope this helps.
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post #11 of 14 (permalink) Old 10-01-2019 Thread Starter
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Thanks
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I always get the cap and rotor together.
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Quote:
Originally Posted by GT'sGT View Post
I always get the cap and rotor together.
Old School. One of the first things that I was taught. Like points and condenser, set of plugs or wires, pair of ball joints...

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There are small differences between caps and rotors. Always replace 'em as a pair if you have a choice. If the bug's shot, chances are, the lid is too.

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