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Paul,
I concur with MikeK that the pulley shown is a junk aftermarket part and they are nothing but trouble. replace with a one piece if the engine is out of the car or two piece if in ( use current quality repro one from Brattons or Snyders). As previously said you can replace the seal by removing the timing cover on the upper half and remove the oil pan to replace if desired on the lower. Personally I would not do it unless leakage is a problem. Polish the seal surface a little and should help.
while you're at it and down there make sure you have the correct original front engine mount and springs installed. See the service bulletins for installation
Best of luck!
Larry S