I just installed an underdive pulley onto my 91 240sx. The install went flawlessly, but now I'm having massive amount of oil leak through the crank. According to my 240 Engine Manual I have all parts necessary to make the seal. Any help will be greatly appreciated!

Link to the exact pulley from ebay

 

you didn't damage the front mail seal did you?

 

i researched pulleys and although its not required.. it's highly recommended to get a new front seal as well. They don't cost much either.

 

The main crank seal was the problem. I replaced it this morning. It appears that the original seal sat out a little far and the new pulley burnt a hole into it. When I installed the new seal I made sure to seat it down further. So far so good, I'll get more miles on it this week for sure. Thanks for the replys.