I'm in the middle of changing my water pump on my 89 190 w/2.6. Since I have so many parts off the car, I thought it would be a good time to try and track down an oil leak that runs down the front center of the oil pan and also ends up on the trans cooling hoses and bottom of the oil pan. The leak seems to happen when the car is running not while just sitting. There doesn't seem to be a leak at the top timing cover seal so I was wondering if it is the front crank seal? Has any one replaced their front crank seal and how would I go about doing this? Should I just redo the timing cover seal and the crank seal since I have most of the front of the engine apart? Thanks in advance.

most likely the front cover at top. Here's the DIY for diagnosis/repair:
http://www.peachparts.com/Wikka/M103TimingCoverReseal

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89 300te 222,222
92 300e 190,000

Yes if you can its a good idea. Like you were thinking the more things you get out of the way the less likely you will ever have to go back in there again.

Also don't forget to change the small o-ring that seals the long bolt that holds the braket from the p/s pump to the fan beering braket. That always sends the oil down the front of the pan when it leaks.

The front crankshaft pulley requires 221 ft lbs of torque and a torque wrench that goes that high - which makes it not a simple DIY job.

Thank you for the replies. I did clean the engine as best I could with those spry can engine cleaners to try and see where the leak was coming from. I wasn't completly sure it was from the top timing cover. I was thinking to replace the seal as a precaution.
The O-ring that is mentioned, is this the bolt that holds the Y-shaped bracket for the PS pump and the long bolt that mounts the belt tensioner? I didn't remove the Y-shaped bracket from the front of the engine only loosen it. I didn't notice an O-ring. Is it between the bracket and the engine or between the head of the bolt and the bracket?
Maybe I will have to pass on the front crank seal as I don't have a torque wrench. I don't need more problems caused by not having things tightened correctly.
Do you think if it were the crank seal the oil would be on the back of the harmonic balancer? It does seem to be dry. It's just the oil down the front of the oil pan that is really noticeable after the car has been running. Do you think it could be the oil pan gasket or would that leak all the time? Thanks again for your help.

Well I finised up changing my water pump along with trans cooling hoses, valve cover gasket, new radiator hoses and resealing the uper timing cover along with a new cam shaft seal per r_p_ryan. Thanks, very helpful writeup. I get everything back together and start the car. Two minutes after, the oil is running down the front of oil pan. I am back to thinking the front crank seal IS bad and needs replacement. Do I need any special tools other than a torque wrench and a puller for the harmonic balancer or other parts other than the front seal? How is the seal removed from the cover and is there any special tools for removal or installing the new seal? Please let me know if anyone has done this repair on a 2.6 engine. Thanks in advance.