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  #1  
Old 09-04-2013, 01:03 AM
Stugist's Avatar
Weekend Wrencher
 
Join Date: Apr 2012
Location: Western Washington, USA
Posts: 118
Lower alternator bolt size (Early W123)

Car's been audibly rattling a lot at low/high RPMs where the engine is shaking the most (cold, on the freeway/above 55 MPH). Looked under the car and found the alternator hanging fine...minus the lower through-bolt. Second time I've had problems with alternator bolts; about a month ago the upper bolt kept trying to back out after loosing the nut (didn't get sheered off by the fan, thankfully). That time I just took a spare nut from a bad starter motor and stuck it on there (perfect fit ). Now I need a new bolt+nut. Anyone wanna take a guess or give an exact measurement of it? Should be something I can just pick up at a hardware store? Or do I have to pay $2.00 at PNP just to (try) and find one?

Also, good or bad idea using threadlocker on these...?

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  #2  
Old 09-04-2013, 04:27 AM
Registered User
 
Join Date: Jul 2008
Posts: 3,740
Not positive on size, but your easy way....is probably going to pick n pull....all the bolts are the same length and the top is the same....so worse case remove it and measure...someone said you can pick one up at the dealer for 8$..

You should work on the vibration and audible rattle....kind of sounds like the air cleaner housing mounts may have broke too..
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  #3  
Old 09-04-2013, 04:52 AM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 36,270
Yeah, better get the correct one.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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