The only reason for water dripping is to lubricate (and cool) the seal/shaft interface. However, the PTFE packing has low enough friction that you don't need to lubricate. Hence, no need for dripping water.
Btw. the main difference between the normal shaft seal (regardless of packing) and the dripless (e.g. PIY) is that in the former the seal is beaten the shaft and the packing box and in the latter it is between two faces of the seal (the shaft does not participate in this seal). Having said this, I don't think your PTFE packing would score the shaft in any reasonable time. When it does you may have other reasons to replace the shaft, anyway. Marek From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of robert via CnC-List Sent: Saturday, February 17, 2018 10:04 To: Neil Andersen <neil.eric.ander...@gmail.com>; cnc-list@cnc-list.com Cc: robert <robertabb...@eastlink.ca> Subject: Stus-List PSS Shaft Seal I used PTFE Tefelon Braided Ramie Packing .....I repacked my stuffing box 6 years ago with it....after Spring launch I adjusted for approx. 2 drops/drips per minute....then after running the engine the drips would stop....I loosen and got the 2 drops per minute again...after the next use of the engine, the drips would stop....loosen one more time, ran the engine and the drips would stop. So I stopped loosening....ran the engine for 2 hours .....got into the lazarette and put my hand on the stuffing box and the prop shaft looking for heat....both were cold so I left things the way they were. The stuffing box does not leak/ drip water although I understand it should. I may be in for a big expense some day for a new prop shaft but in the meantime, my bilge is dry except for what comes down inside the mast when it rains. I can live with that, we all do. Rob Abbott AZURA C&C 32 - 84 Halifax, N.S. On 2018-02-17 12:24 AM, Neil Andersen wrote: What "quality product" have you found success with? Neil Andersen 1982 C&C 32 Rock Hall, MD Neil Andersen 20691 Jamieson Rd Rock Hall, MD 21661 ________________________________ From: CnC-List <cnc-list-boun...@cnc-list.com><mailto:cnc-list-boun...@cnc-list.com> on behalf of robert via CnC-List <cnc-list@cnc-list.com><mailto:cnc-list@cnc-list.com> Sent: Friday, February 16, 2018 11:10:59 PM To: cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com> Cc: robert Subject: Stus-List PSS Shaft Seal I would not change to a dripless stuffing box when a much simpler and safer option is available.....as David said here before, repack your existing box with a quality product and you are virtually drip free....I did mine 6 years ago and it still doesn't drip...and I have checked and there is no heat on the prop shaft, stuffing box, etc. I never worry about a catastrophic failure a PSS dripless stuffing box can endure. Rob Abbott AZURA C&C 32 - 84 Halifax, N.S. On Feb 16, 2018, at 9:05 PM, Brien Sadler via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Has anyone changed to a PSS dripless stuffing box? I'm sold on the switch I just haven't figured out how I'm going to run the vent line yet. Any suggestions would be great. Preliminary plan is to run it to a very small through hull at the top of the transom. Thanks, Brien
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