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Old 06-17-2007, 03:55 PM
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Join Date: Apr 2005
Posts: 23
6mm hex bolt is hexed

I am three weeks into replacing a water pump on my 190e and have removed all but one bolt. The remaining bolt is the top front 6mm hex bolt. I cannot securely place a 6mm key into the bolt and have no idea what the problem is. Therefore, my question is obvious. What is the best approach to remove this bolt if the proper tool is useless? I am so close, yet so far.



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Old 06-17-2007, 04:32 PM
TheDon's Avatar
Ghost of Diesels Past
Join Date: Oct 2005
Posts: 13,217
can you fit a ball end Hex in there?
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Old 06-17-2007, 05:12 PM
Larry Delor's Avatar
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Join Date: Jun 1999
Location: Sarasota, Fl.
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Does it not go in far enough? Or is there slop? I've heard of some people dipping the bit into scouring powder (Ajax,Comet, etc) for extra grip.
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Old 06-18-2007, 11:45 AM
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Join Date: Feb 2005
Location: Cleveland, Ohio
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Put the other bolts back in and tighten them down. No sense in trying to free the hardest bolt to remove after the other bolts have been removed,,,,

Make 100% certain that ALL THE CRUD is out of the hex head, otherwise you'll strip it,,,
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Old 06-18-2007, 02:09 PM
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Use my favorite new tool - the Dremel with a grinding bit.
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Old 06-18-2007, 06:21 PM
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Join Date: Apr 2005
Posts: 23
Game, set, and match!

I got it off by wedging in a 6mm and praying. The new pump is back on. Tomorrow I put everything back together. Maybe it is not match yet, but it is close. Thanks to all for your help.
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Old 06-19-2007, 05:56 AM
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Join Date: Aug 2002
Location: Southeastern PA
Posts: 3,048
jbadgio, recommend that you buy a new 6mm allen bolt from your local MB dealer before you install the new water pump ... to avoid problems the next time around.

Fred Hoelzle
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