I used the handle of my foor jack.......and all the strength I could muster and got it loose. Would have been hell to do from under the car.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

Clean the area in and around the hole. Insert the short end of a 14mm bent allen wrench. Position it so that you can get a cheater pipe on the long end of the wrench. Weld the wrench to the plug using 2 good tack welds, one on either side of the wrench, using a 5-p or 6010 welding rod. Let it cool to the touch and I bet the plug will come out with a minimum of effort. Once the plug is out salvage the wrench by cutting it off at the plug, back about 1/2" from the weld, with a hacksaw. No sense scrapping a good wrench. Install a new plug with one wrap of pipe tape and a reasonable pull with the allen wrench.

My version of the AMG 'Hammer'...has worked ok for me so far.

Attached Thumbnails

 

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Never a dull moment at Berry Hill Farm.

Rusty, Looks like you need a new boot on your axle in that photo.

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Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.