Well according to your schematic, If there is no line going to the 90 fitting, then it must be supposed to be turned down, so oil can't enter. I had a lot of oil inside my bellhousing, because of the seal leaking around the jack shaft. I got it cleaned out and went to Bearings INC. and bought a seal that works well. the old seal didn't have a number on it, and my manuals didn't list a part number, so I took the old seal in and had it measured. They used a co2 fire extinguisher to quick freeze the rubber on the old seal, so it would not depress the rubber when using their calipers. I am going to post the replacement seal number here for anyone that might need to replace one. It is a CR12830, and fits snugly on the shaft, and is a press fit in the bellhousing recess.Acording to their measurements, it measures 1.281 ID and costs $6.49+ tax.
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