Your boat is pretty new but watch the engine mounts as someone else revs engine. Movement of the shaft as RPM increased caused same symptoms on mine (but it had 6000 hrs). Do you have water injection into the PSS? It could be blocked. I agree-- call PSS An aside... I had almost the opposite problem at one time. I was running on one engine up Lake Michigan and the seal on the off engine started spraying water. Because of the slow speed, carbon had built up on the interface enough to break the seal. Burping and rubing the faces together cleared it. Running that engine did to. (I then turned back on course-I had turned toward Frankfort MI ,an hour away. Called PSS the next Monday for consult. hth **************** Elliott Bray www.loopcruiser.com **************** > Message: 4 > Date: Tue, 31 Jan 2012 08:43:17 -0500 > From: "Kratz, John M." <kratzj@musc.edu> > To: "'great-loop@lists.trawlering.com'" > <great-loop@lists.trawlering.com> > Subject: GL: PSS dripless shaft seal > > I have a leaking PSS dripless shaft seal, 49 Defever, 2006, > about 500 hours on engine. Leaks around the where the large > metal ring meets the bellows. Does not leak until engine > reaches 1800 RPM. Had mechanic on board who adjusted > slightly and now down to a fine spray. Shaft running true. > He suggested perhaps the shaft tube is blocked resulting in > increase in water pressure as RPMs come up and water pressure > from engine increases. Any ideas? Have you guys seen this > before? Can a diver improve situation by scraping where > shaft comes out of hull? >