I am trying to replace the combo switch on my '97 E300D. Unfortunately, the 10MM hex bolt does not want to budge. I have followed the steps I have found in various posts but to no avail:-( I have used a helper to hold the wheel, + a breaker bar to break it loose. The point on the hex tool has started to turn slightly when the bolt hasn't....so it is starting to strip:-(

Any recommendations/tricks, etc. on how to get this thing out would be much appreciated. I don't know why mercedes put a bolt like that in there in the first place as there is plenty of room for a "normal" bolt head to portrude.

Should I try an impact wrench? JB weld? Or?

Thanks in advance!!!

Brian

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1987 560SL - 95K
1996 E300D - 183K
1997 E300D - 162K
1982 240D - 160K

It's a tapered seat so it can tend to freeze. That's also why it's not a "regular" bolt.

An impact wrench is fine, including the mechanical type.

You'd probably do this anyway, but I'd suggest replacing the bolt. You'll have to source it at the dealer, but it's worth it.

Good luck.

Thanks for the info Greg!....any ideas on what to do if the inside of the bolt strips?

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1987 560SL - 95K
1996 E300D - 183K
1997 E300D - 162K
1982 240D - 160K

Brace from a wheel spoke to the floor of the car using a 2x4 and use an air powered impact wrench. It is unlikely that a helper can hold the wheel firmly enough. Make sure your hex driver is fully seated in the bolt hole. Tap it in there with a few light hammer blows.

With typical Benz engineering overdesign, the bolt has a tapered seat AND is also locktited in place. Once it is out the tapered seat is more than sufficient to keep it in place. The tapered seat offers a huge bearing surface.

By all means, replace the bolt if you can find one.