Arbitare 0 Posted June 24, 2018 Share Posted June 24, 2018 hi just looking for information regarding replacing the lower bearing/bush on my 80's farr developed a rudder knock after the last ocean race.I think possibly due to the new auto helm.It looks as though it might come out from the top as there is a good sized flange arrangement in the transom where the rudder shaft goes thru hull anyway any information of the heads up kind would be appreciated Quote Link to post Share on other sites
Island Time 1,211 Posted June 24, 2018 Share Posted June 24, 2018 OK, if it's the same, or similar to my 1988 farr phase 4, which seems likely, there is a glass rudder tube, with a cylindrical bearing, plastic, top and bottom. The top one has a flange on top, with a thrust washer. They are a very tight fit to the tube, possibly an interference fit or epoxied in. When I changed mine, I cut them out with a sabre saw. Got a machine shop to make new ones, acetate iirc, epoxied them in. Was not an expensive job, and they are still good. Research the exact type of plastic, as some bearing plastics expand in water, and can seize the stock... Quote Link to post Share on other sites
Island Time 1,211 Posted June 24, 2018 Share Posted June 24, 2018 I could help if you want, and are in the auckland area. Send me a PM or call on 0221539176 if you need help. Quote Link to post Share on other sites
Arbitare 0 Posted June 24, 2018 Author Share Posted June 24, 2018 thx mate in my boat there is a heavy metal tube outer coming two thirds up the shaft and a stainless flange at the base will open them up and see whats in there Quote Link to post Share on other sites
Arbitare 0 Posted June 24, 2018 Author Share Posted June 24, 2018 Thank you for the offer of help but am in welly Quote Link to post Share on other sites
Arbitare 0 Posted June 24, 2018 Author Share Posted June 24, 2018 Oh yea forgot to say my boat was built at compass yachts in 84 Quote Link to post Share on other sites
Island Time 1,211 Posted June 24, 2018 Share Posted June 24, 2018 Ok, it’s not the same. Take a pic so we can see what’s there if you need help. Quote Link to post Share on other sites
Arbitare 0 Posted June 24, 2018 Author Share Posted June 24, 2018 will do thx Quote Link to post Share on other sites
marinheiro 352 Posted June 24, 2018 Share Posted June 24, 2018 I assume this is about a Farr 11.6, they stopped the tube below the underside of the deck for wheel steering quadrants (for those who did not want stretched arms!), then there is a top bearing on the deck Quote Link to post Share on other sites
Battleship 100 Posted June 25, 2018 Share Posted June 25, 2018 These Guys made ours if you can't find anywhere closer to home, quite a few boats around here have used them. http://www.supplyservices.co.nz/plastics.htm#ADCOMP Quote Link to post Share on other sites
Arbitare 0 Posted June 26, 2018 Author Share Posted June 26, 2018 ok rudder coming out today will know bit more after that Quote Link to post Share on other sites
Tim C 23 Posted July 4, 2018 Share Posted July 4, 2018 Do not use Nylon as a bearing material. It will expand underwater and seize the bearing and steering... Quote Link to post Share on other sites
Steve Pope 243 Posted July 4, 2018 Share Posted July 4, 2018 Vesconite is the way to go, Chatfields are the agents, they have pre bored lengths that given the od. and id., allows for crush so that they don't need line boring., Quote Link to post Share on other sites
Battleship 100 Posted July 5, 2018 Share Posted July 5, 2018 Do not use Nylon as a bearing material. It will expand underwater and seize the bearing and steering... I thought people stopped using that in the 80's. This is the stuff. ACM COMPOSITE BEARINGS High Pressure & Marine Bearings Contact us for our comprehensive ACM Composite Bearing design manuals for general and marine engineering. ACM Composite Bearings are premium high pressure bearing materials. They offer engineers cost effective alternatives to phosphor bronze, with many advantages over phosphor bronze and older traditional bearing materials sometimes used in its place. ACM TriboTex 7 for general purpose engineering applications. ACM TriboGlide 15 for low friction, dry running applications. ACM TriboTape for guide bands in hydraulic cylinders. ACM L2 Marine grade has multiple marine class approvals for use as ship rudder bearings and water lubricated propeller shaft bearings. Quote Link to post Share on other sites
Island Time 1,211 Posted July 5, 2018 Share Posted July 5, 2018 Or vesconite, or about 100 others... Ask a plastics engineering specalist Quote Link to post Share on other sites
Neil 35 Posted July 5, 2018 Share Posted July 5, 2018 Slightly, off topic but at the moment I'm replacing the top and bottom bearing in the steering pedestal of our 1220. Standard ball bearing based ones "6210 2RS" and was simply going to replace with exactly the same. As long as the pedestal remains dry inside all should be good - it wasn't watertight at some point in the past (compass light wire I think) hence the bottom bearing corroding out. However, you've now got me wondering if there is a plastic equivalent I could use to avoid all future corrosion issues regardless of my sealing abilities. Any thoughts? Quote Link to post Share on other sites
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