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Old 01-02-2004, 08:04 PM
Join Date: Sep 2000
Location: Sugarland, TX
Posts: 285
Remove motor mount top bolt

I am having a hard time to remove the left motor mount top bolt (17mm). The car is a 91-300E (124-M103). Any suggestion?

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Old 01-02-2004, 09:58 PM
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Join Date: Apr 2001
Location: fort worth
Posts: 363
I changed my 87 300Es motor mounts in Nov. I used a box end wrench from below. I did not try a socket from above. I also did not use a torque wrench on either sides top bolt. George Murphy describes the procedure on p86 of the Star(Sept -Oct) MB Club magazine. Good luck
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Old 01-02-2004, 11:09 PM
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Join Date: May 1999
Location: Sacramento, CA
Posts: 1,472
The only time I've ever been able to get one of those off, I was using a borrowed 17mm box end wrench, with the open end ground off, and a long pry bar for leverage against the wrench handle. (If you try this route, be careful what you use as a fulcrum! Pick something structural, and make sure nothing flimsy is in the way.)
2000 C 2 3 0 Sport :: 180k
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Old 01-03-2004, 10:39 AM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
You will probably have to jack the engine up for clearance -- with the mount collapsed, there isn't enough room to reach in from the top.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 01-03-2004, 07:16 PM
irieite's Avatar
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Join Date: Nov 2002
Posts: 157

On my 190e, I removed the air flow meter and fuel distributor. This allowed almost a clear shot straight down to the top bolt.

With a long extension and swivel, I was able to break it loose. It was VERY tight and I tried everything else first.

Just make sure you are square on the bolt head and don't slip! You don't want to round the head, or then you'll really be screwed!
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