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Old 03-13-2010, 10:57 AM   #1
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Default Name that bolt!

Alright, I was driving down the interstate when I heard a clang.

Nothing bad came of it, until I dropped rpm down to 1800 or so and a horrid squeeling deafened me. It appears that my lower alternator bolt has wiggled itself out, allowing my alternator to move ~1/2 an inch, giving too much slack in the belt, hense the squeeling.

Anyway, my question is what size is that bolt? I need to pick up a replacement asap.
Its the bottom-most bolt on the alternator (mount?), head of the bolt is facing the radiator, and I want to say its wrench size is 12mm.

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Old 03-13-2010, 11:49 AM   #2
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Im going to take a stab in the dark but mazda likes to use M8x1.25 bolts might give that a try.
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Old 03-13-2010, 11:55 AM   #3
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Same damn thing happened to me on my '90 and my '92. Both times I was working part-time at Advance Auto so I just grabbed some random "alternator bolt" from the "HELP" brand section. It's not threaded on either side if I remember correctly, just a hole through the alternator and the block that a bolt slides into and you throw a nut ont he back of.

Good luck.
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Old 03-13-2010, 12:00 PM   #4
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That's the maIn pivot bolt, yes? If so you'll never find one that big at a hardware store I wouldn't think. Might need to go to the dealer. The biggest piece of all thread that'll fit and two nuts would be an acceptable temporary solution.
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Old 03-13-2010, 01:14 PM   #5
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almost lost mine before as well, loctite that thing
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Old 03-13-2010, 01:38 PM   #6
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I had one work loose just enough to allow the bolt wear away about 1/8" of the surrounding aluminum making an oval hole and removing the threads of the bolt. I couldn't get a real bolt to tighten. Picked up a slightly longer 3/8" (or 5/16", I forget) with a nut and washers which works just fine. I filled the worn away aluminum with JB Weld to help keeping it stable. When the water pump gets replaced the problem will go away.
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Old 03-13-2010, 01:40 PM   #7
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I think it's M10, not sure whether it's 1.25 or 1.50.
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Old 03-13-2010, 06:48 PM   #8
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I remember it backing out some before, and I noticed the threads were pretty chewed. Not sure if I can throw a nut in on the back, but will see what I have to work with.
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