>>... the older version which has to be "burped" after launched to release the >>air trapped in the shaft log. <<
On the older PSS shaft seal versions without the vent tube; burbing may also be needed after sailing in boisterous conditions where the boat may "surf" or experience turbulent water near the prop shaft. Also, if a diver using SCUBA has been under the boat, some of the vented air bubbles may get trapped in the bellows. If you are motoring along (several hours or more) and begin to hear a squeaking sound from the shaft seal area, air may have been trapped prevent water from cooling and lubricating the shaft seal to prop shaft rotor interface. Happened on Calypso sailing/motoring between Barkley Sound and Roche Harbor (18 to 20 hours underway, fog with wind for 15 hours). It was 0dark30, rough seas owing to the tide rip off Victoria BC, not enough wind to make decent progress against the current so we are motor sailing. I could faintly hear a squeak over the on deck noises and the engine. One of the Calypso crew dropped down under the cockpit to investigate and confirmed the noise was coming from the shaft seal. (It was also warm to the touch.) A quick burp and all was well. On the flip side (traditional stuffing box), I had a Ericson 30+ in a timeshare lease program back in the early 80's with a traditional stuffing box. While a customer was motoring along the packing nut became loose. (I never determined why and the maintenance service claimed it had been checked and the lock nut was tight. My guess was the packing nut was over tightened and became loose when the customer backed out of a slip.) The boat was on its way to the bottom by the time the customer figured out he could screw the packing nut back on and stem the flow enough for the pumps to keep up. Hauled the boat immediately and put on a PSS Shaft Seal. Martin Calypso 1971 C&C 43 Seattle [cid:D1BF9853-22F7-47FB-86F2-4115CE0BAF2F] From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Rich Knowles Sent: Wednesday, October 16, 2013 9:16 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List [SPAM] Now on to STUFFING BOXES Ditto Joe's experience. Mine is the older version which has to be "burped" after launched to release the air trapped in the shaft log. The more recent versions have a vent that must be led above the waterline. Rich Knowles INDIGO LF38 Halifax, NS. On 2013-10-16, at 10:45 PM, Jake Brodersen <captain_j...@cox.net<mailto:captain_j...@cox.net>> wrote: Alex, I put in a dripless system 12 years ago. No a single issue with it. I would do it again in a heartbeat. No muss, no fuss, and a dry bilge. Jake Jake Brodersen C&C 35 Mk-III Midnight Mistress Hampton VA
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