Join Date: Oct 2009
Location: Cape Cod
Thanked 106 Times in 103 Posts
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I don't know exactly what you have, but I had a last drop fitting problem on a previous boat that turned my dripless fitting into a rotary sprinkler for the engine room.
If its like what I had, there is a bellows of some sort that wears against a donut shaped item that is attached to your shaft. The principle is that the pressure of the spring in the bellows against the donut is what stops the drip. In my case, the donut, which was held to the shaft with a set screw, had slipped forward. This caused less pressure from the bellows part, and therefore the leak.
If, and I emphasize IF, that is what happened to you, it can be corrected by pushing the donut back, and retightening the set screw. For belt and suspenders, you can also put a shaft zinc in front of the donut (between the donut and the transmission). This way if the set screw moves again, the shaft zinc might stop its forward progress preventing this failure.
DISCLAIMER: AGAIN, you've given very little information on your setup, which may be different or failing in a different way, so use caution and seek professional help if you are in doubt. The shaft log is a major hole in your boat and can sink you if it fails.