Thanks, Is "allen bolt" the right name for it?

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE

not really. I think everyone would know what you're talking about, though! A hex bit is the tool used to loosen/tighten a socket head (allen??) fastener. A hex head bolt has an externally hexagonal head.

I guess it doesn't really MATTER what you call them, as long as we can all agree to call them the same thing. Shall we take a poll????

Cheers!

Jay.

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On the road, currently:
'83 300D (German spec.) 168k mi. - - Wolfgang (tucked snugly away for the winter!)
'87 300D 375k mi. - finally went over to "The Dark Side"
'87 300TD 225k mi.
Cannondale 66cm CAAD5 w/Campy/Jamis Aurora
Hujsak Custom Fixie/Landshark Track Shark Custom/Ahearne Custom 29'er

I believe the proper terminology is 'socket head cap screw'.

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Fred Hoelzle

First, I'm inclined to go along with the suggestion that it was on the ground when you started. From the look of it, it hasn't been in a hole for a while. If it was, the portion of the threads that were in use would be much cleaner.

Having said that, it appears that it would take about a 4 or 5mm hex bit, either of which are used on the throttle linkage brackets, the throttle body and various brackets securing components to the manifold and head such as the EGR tube, etc. Maybe also look at your cruise control unit where it bolts to the block.

It was certainy not on the garage ground when I started, maybe it was loose and fell into the belly pan then landed on the floor when I removed the pan without my knowing.
So it is not advisable to put the bolt to the first hole I saw, I gonna look again. I appreciate your inputs.

__________________
1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE