Hey Greg,

I've had to replace both hinges on my two front doors of my '88 240. It's really not that bad. I found good hinges at a pick-your-part.

To get at the hinge from the inside (car side) you need to take the bottom molding off to get the black rubber strip pulled away so you can take the side cover off and expose the fuse block. There are two screws holding the fuse block on, just take those off and you can move the whole block out of your way. (don't forget to disconnect the battery)
Once that is out of the way you need to pry off the black paper to get at the three bolts that hold the hinge onto the car.

Remember that once the new hinge is in place you may have to re-align the door so that it shuts and seals right. The adjustment for that is in three bolts you remove from the car side. Once I had the door sealing right I actually had to adjust the latch catch (on the body where the door closes and latches) so that it shut smoothly. No big deal just need an allen wrench of the right size and some minor tapping.

Good luck,
Ryan
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'68 122, '88 240 DL (5 spd)