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By miker - 7 Years Ago
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I’ve had a couple of these “kits” to put an alternator on the oem generator bracket. One from a ‘bird supplier, and one from the Classic air company. I pulled the bird out of winter storage and went to check the a/c charge. While I was setting up, I realized the alternator was wobbling all over. Still charging. I shut it down and went looking. This is what I found on the front mounting bolt, which threads into the “coupler” style adapter to the rear mounting point. This is an unrated stainless bolt, maybe something I substituted, or got changed, or who knows. Because of the EFI, electric fans, wipers, and a/c, it’s a pretty heavy 90 amp alternator.
At any rate, it’s got a grade 8 in it now. Might be worth a look if you’re using something similar. Pretty lucky to find it in the garage and not on the side of the road.
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By PF Arcand - 7 Years Ago
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What diameter is that bolt? A stainless bolt should be quite strong.. How tight was it or how much torque was on it!
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By miker - 7 Years Ago
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It’s a 3/8-16 by 3” bolt. It probably wasn’t over torqued as it tough to get to, and you can’t get much of a wrench on it. It shows signs of crystallization at the break. I think it was a combination of load and vibration.
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By paul2748 - 7 Years Ago
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Ordinary stainless bolts are not that strong. They do make a grade 8 equivalent stainless through Totally Stainless although I don't know if available in your particular length.
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