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  #16  
Old 04-10-2015, 07:58 PM
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Quote:
Originally Posted by spock505 View Post
Yup, captive washer although I may have just have invented that terminology

Basically the washer is held in place by a small recess under the bolt head.

I can have a look at mine to see if there's anything that looks obvious.
A captive nut is used on many older British and some older US cars ( fender mounting ) It uses a square nut in a thin sheet metal cage. The entire mess clips into a square hole opposite to what you want to attach. They usually don't survive removal if there is much rust on the threads.

A captive washer is a proper term for a washer that is free spinning but does not fall off the threads.

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  #17  
Old 04-10-2015, 08:26 PM
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Quote:
Originally Posted by 97 SL320 View Post
A captive nut is used on many older British and some older US cars ( fender mounting ) It uses a square nut in a thin sheet metal cage. The entire mess clips into a square hole opposite to what you want to attach. They usually don't survive removal if there is much rust on the threads.

A captive washer is a proper term for a washer that is free spinning but does not fall off the threads.
Thanks for backing me up on that one, ta
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  #18  
Old 04-10-2015, 10:12 PM
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Looks like it goes to the metal shroud around exhaust near engine(depending on model). I've seen that bolt before... exhaust shroud is what pops into mind. maybe metal shroud around drive shaft.
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  #19  
Old 04-11-2015, 11:46 AM
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Thanks for the replies guys. See attached photo of the head of the bolt. Do the markings on it tell us whether it is a factory bolt? A 10 mm socket fits it. No aftermarket things it could have come from. Yes, there is a captive washer. I looked from above and didn't see any bolts like that or see any bolts missing. I'll check from the underside next time I have the covers off. The injector line clamps did cross my mind, but it's been several years since I've done anything with them. I should have noticed the bolt before, since the engine covers have been removed many times since I did that job. I did just recall that I had the hood repainted this past fall and I believe that the paint shop removed the headlights to do that job. Maybe it came from them?
Attached Thumbnails
Recognize this bolt?-img_1911.jpg  
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  #20  
Old 04-11-2015, 01:55 PM
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Run " boesner bolt " through the google machine, there a few other people looking for bolts too.

Boesner is a brand name, the Porsche people are fretting over whether to use Boesner or KAMAX on air cooled engine tin! Which Engine Tin Bolts? - Pelican Parts Technical BBS
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  #21  
Old 04-11-2015, 02:10 PM
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I haven't seen one like that on either of my Mercedes vehicles before...

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