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Old 08-20-2007, 10:18 PM
Now with more fiber!
Join Date: Oct 2006
Location: Atlanta, GA USA
Posts: 11
This evening winmutt came over and helped me out. He always seems to have the solution that will fix the problem in such a way that it might never work again, but darn if it won't work now! With the help of a 3-pound blacksmith's hammer, he got that bolt started and probably cross-threaded the hell out of it, but it's sure in there nice and tight.

The first few threads in the arm seemed to be stripped out, but once we made it past that it wasn't so bad. Pity the fool who has to deal with that 20 years from now

Hopefully I won't find myself rattling that loose, but in that event, I'll just have to pick up a new arm at the yard, and all should be well. Thanks again for everyone's advice.
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Old 08-20-2007, 10:41 PM
lietuviai's Avatar
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Join Date: Mar 2003
Location: SW WA
Posts: 5,741
I don't think mounts last 20 years on these cars. I've read around this forum that its more like 5 years.

84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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Old 08-21-2007, 05:40 AM
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Join Date: Jul 2007
Posts: 104
Would a helicoil work if the threads were stripped out?
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Old 08-21-2007, 10:21 AM
winmutt's Avatar
85 300D 4spd+tow+h4
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,325
The lower portion of the arm was stripped maybe about 1/2" in, probably at the last replacement. I think it would be easier to get a new used arm than anything else. I whhhhhacked it in (cornholio!) pretty good and tightened until the 3/8 socket he had started slipping. I am fairly certain it isnt going anywhere. It might be a good idea to get a new arm now and keep it around JIC.
1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
OBK #42
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Old 08-21-2007, 10:26 AM
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Join Date: Sep 2004
Posts: 8,516
Originally Posted by winmutt View Post
The lower portion of the arm was stripped maybe about 1/2" in, probably at the last replacement.
I suspect that the erroneous torque value specified in the Haynes manual is responsible for more than a few stripped engine supports.
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Old 08-24-2007, 12:41 AM
Now with more fiber!
Join Date: Oct 2006
Location: Atlanta, GA USA
Posts: 11
As a final (let's hope so anyway) note, I was tonight able to get everything back together and happy. I had to undo winmutt's center bolt magic and jack the engine way back up in order to get the inner mount bolt threaded correctly. This required some wiggling of the mount itself to line up the holes for that bolt, and once I finally got that in place, I was able to re-thread the center bolt with no trouble at all. This pleases me, as I suspect maybe the threads weren't stripped so badly after all.

After zipping the ol' gal back up, driving around the block is like a dream. I had to stop myself from just keeping on into the night.

Next up: oil pan gasket, new engine shocks, new (boneyard) exhaust accordion downpipe.
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Old 08-24-2007, 04:14 PM
Registered User
Join Date: Jul 2004
Location: Norwich, VT USA
Posts: 905
engine mount glitch 1985 300D

my experience from a coupla years ago....Cheers!
Rob M
Norwich, VT USA
1980 240D Euro delivery 4 speed manual silver/blue
~160K miles
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