I agree that what you need to do is replace the lower seal part number 14 in the drawing. The only fluid that should be in the lower part of the steering gear is a non-pressurized oil bath for the worm and sectors. This non-pressurized oil supply is filled only to the level of the fill plug, which is number 52 in your drawing. Note that this fill plug is below the level of the part you are looking to replace, number 18. Unless you are on an extreme slope when the seepage comes out of this valve, the fluid can never get high enough to come out of it. You can't fill the lower reservoir of the steering gear higher than the fill hole (plug for hole is part number 52). The only way to get the fluid in this lower section higher than the fill hole is by a leak in the lower seal, part number 14. The vent valve part number 18 is not meant to stop the leakage of pressurized power steering fluid, so I highly doubt that even a brand spankin' new one will do so. Just my 2 cents worth. Best of luck to you. My steering gear rebuild was easy enough. Don't hesitate to dig into it.
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