Is it recommended to periodically replace the hydraulic fluid in the Navtec backstay adjusters?
If so is it a DIY project and what is the recommended replacement fluid? Dwight Veinot C&C 35 MKII, Alianna Head of St. Margaret's Bay, NS _____ From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Joel Aronson Sent: November 26, 2012 11:03 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List Backstay tension I have the same original unit as Jake. The fluid apparently had never been changed. It was like molasses instead of looking like vegetable oil. It would have been cheaper to replace it, but I didn't know that going in, so I had it all flushed and rebuilt. If your hydraulic backstay has never been serviced, it may need attention. Joel 35/3 Annapolis Sent from my iPad On Nov 26, 2012, at 7:46 PM, dwight veinot <dwightvei...@hfx.eastlink.ca> wrote: Jake My Navtec adjuster is probably an older unit than what you have. It came to me with the boat so I am guessing it is probably around 15 or more years old. It is an integral unit and the gage and knob for the relief valve are attached on opposite sides near the base of the square looking cylinder. I think it reads in psi and its readings correlate quite well at around 800-1200 psi when I check backstay tension with my Loos gage but my inexpensive Loos gage max's out at around 1200 on 9/32 wire so it is not useful for tension comparisons above that. I have tensioned the backstay incrementally to 3000 lbs according to its gage but as I said earlier tensions above 1200 psi has no noticeable effect on pointing ability or boat speed but a slight effect on weather helm and head stay sag. I spend my cruising time fiddling around with a lot of adjustments and measurements but I am happy to admit that I am still learning and very interested in what others have to contribute. I guess I have been lucky that the hydraulic seals have lasted as long as they have without problems. Dwight Veinot C&C 35 MKII, Alianna Head of St. Margaret's Bay, NS _____ From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Jake Brodersen Sent: November 26, 2012 7:55 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List Backstay tension Dwight, If you Navtec gauge is like mine (in a panel), it probably reads direct pressure, not the pressure exerted on the backstay. They would be the same if the piston area was 1 sq. inch, but otherwise the pressure times the piston area will give you the tension on the backstay. Jake Jake Brodersen C&C 35 Mk-III "Midnight Mistress Hampton VA
_______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
