Broken stud. - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 4 (permalink) Old 06-11-2019, 04:40 PM Thread Starter
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Exclamation Broken stud.

After returning home from work this morning, I backed my car into the garage and came inside the house. Seconds after closing the door to the garage, I heard a loud bang followed by something knocking around. I thought something fell off a shelf but then I went and looked around and found the stud and nut in the photo. Apparently it came off with enough force to ricochet a few times. It didn't match any of the hardware on the garage door so I peeked under the front of the car. I noticed the exhaust studs look very similar but both were present on the part I could see (base of front manifold?).
Should I be alarmed? I haven't started the car. If it sounds weird tomorrow when I leave for work, I can drive my wife's car.
I have no way of lifting the car to take a look. Anyone who's been under their car recognize it?
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post #2 of 4 (permalink) Old 06-17-2019, 10:17 PM Thread Starter
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No replies...guess I wont be alarmed. I haven't noticed anything different. Occasionally I think it sounds louder when I punch the gas but it could just be placebo effect. I'll just be sure to have the mechanic check it out next time I go in for an oil change.

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post #3 of 4 (permalink) Old 06-17-2019, 10:45 PM
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It could also be that the bolt was on the floor and you stepped on it with the edge of the tire. I cannot think of anything that would have that much stored energy (besides the springs) to launch the bolt like that.

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post #4 of 4 (permalink) Old 06-18-2019, 06:14 PM
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Hello, it would help a bit knowing the size bolt we are dealing with.
Did you check the garage door spring?
I had a manifold bolt shear but at something like 20in/lbs of torque it just fell on the alternator where it stayed for years.
I like the tire explanation.


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