It is to break the bond that may affect the actual torque values. Bill Dakin
> On Apr 26, 2017, at 2:40 PM, ahycrace--- via CnC-List <[email protected]> > wrote: > > What is the theory behind loosening the bolts before re-tightening? > > Gary > "liberty" > ---- Ken Heaton via CnC-List <[email protected]> wrote: >> Hello Ron, >> >> >> 1. What are the torque values that you’ve used? >> >> >> 3/4" Keel Bolt (aft) takes a 1-1/8" Socket, Torque to 250 lbs. >> >> 1" Keel Bolt (forward) takes 1-1/2" Deep Socket, Torque to 350 lbs. >> >> 1 1/8" Keel Bolt takes 1-13/16" Socket, Torque to 400 lbs. >> >> 1 1/4" Keel Bolt takes 1-7/8" Socket, Torque to 450 lbs. >> >> 1 1/2" Keel Bolts take 2-1/4" Socket, Torque to 600 lbs. >> >> >> 2. Did you back off the nuts and lubricate? >> >> >> Yes, one at a time. Decrease torque values by 10 % We snick up on the final >> torque values in steps, doing all the bolts, then retourquing to a higher >> value, then repeat until you get to the final values listed above. >> >> >> 3. If so, what did you use for lubrication? >> >> >> We lubed them with Tef Gel. The function of Tef-Gel in eliminating seizing >> galling and friction welding of stainless steel, inconel, and other nickel >> alloys. >> >> >> Tef-Gel applied to both mating surfaces of nuts and bolts or threaded holes >> and bolts leaves a layer of 40% solid PTFE within the thread interface, >> which works as friction barrier. Tef-Gel, which contains 0% volatile >> solvents, will no evaporate, cold flow, or dry out, giving protection many >> years later when hardware must be dissembled. >> >> >> http://us.binnacle.com/product_info.php?products_id=8658 >> >> >> Ken H. >> >> On 26 April 2017 at 09:50, Ron Ricci via CnC-List <[email protected]> >> wrote: >> >>> A few months ago, there was a discussion of rust stains and weeps of water >>> appearing on the keel. My first thought had been that water from the bilge >>> leaked around the keel bolts when the boat is on the hard. I had the >>> boatyard do some exploration. They found a void in the keel that >>> apparently filled with water. The void appeared threaded and may have been >>> used to lift the keel. This all can be seen at: https://1drv.ms/f/s!AhpB- >>> lul9d5YpQkMDs5DeOkS73p2. Continued inspection found that there was no >>> water leaking down from the bilge. >>> >>> >>> >>> While my boat is out of the water with the mast out, I’m going to torque >>> the keel bolts. The C&C website lists torque values for ½” (80 ft-lbs), ¾” >>> (250 ft-lbs) and 1” (350 ft-lbs). The 37+ may have another larger size >>> bolt. I don’t know where these came from but found something similar >>> attributed to an employee of Mars Metal (keel manufacturer?). Can any >>> other owners confirm a few things? >>> >>> >>> >>> 1. What are the torque values that you’ve used? >>> >>> 2. Did you back off the nuts and lubricate? >>> >>> 3. If so, what did you use for lubrication? >>> >>> >>> >>> Regards, >>> >>> *Ron* >>> >>> Ron Ricci >>> >>> S/V Patriot >>> >>> C&C 37+ >>> >>> Bristol, RI >>> >>> [email protected] >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> >>> This list is supported by the generous donations of our members. If you >>> wish to make a contribution to offset our costs, please go to: >>> https://www.paypal.me/stumurray >>> >>> All Contributions are greatly appreciated! >>> >>> > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you wish > to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated!
