The glow plug issue seems to be more about carbon buildup rather than seized glow plug threads. I recently changed out all 6 plugs in my 96 e300d, and as mentioned by other posters, sweat and patience is a big part of the job. The plug nearest the firewall, between the block and oil filter housing was the one that was bad. Using a lot of PB Blaster and Freeze-Off, I was able to get it out after about 6 hours of minuscule movements back and forth. Information provided by other posters indicated that 45 n/m was the failure point of beru glow plugs, and I used a torque wrench in the removal of the plugs, and tried to stay within that value. Very nerve wracking job, but doable with a little time and patience.

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96 E300d

I'll be doing mine in the next couple weeks. In the meantime, I wish people could lay off these spooky threads

I notice that Diesel911 is now making a reamer for the 604,605,606 & 648 engines:
http://www.peachparts.com/shopforum/showthread.php?t=205862

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Jake
1999 e300d PlantDrive WVO/SVO conversion
**note to self: oil changed at 268k kms**
1990 Toyota 4Runner FrankenDiesel swap

Forewarned is forearmed.............gives you the pitfalls of the job before you enter into it, and some of the solutions to those pitfalls.

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96 E300d