Look in the description section of the video for useful links. https://youtu.be/n6B0IPKQERc
If the flats of the nut are at 1-1/2 inch then the studs are 1 inch and you're looking at roughly 230 to 250 ft-lbs lubricated torque value. A large torque wrench from Home Depot or Lowes should max out at 250. It will almost certainly be 1/2 inch drive. Operating any torque wrench at its high limit is always difficult... But doable. I would probably try to save myself the money on a torque multiplier and just get the biggest torque wrench and 1/2" drive extensions and a 1/2 inch drive, deep, 6 point, 1-1/2" socket. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Thu, Feb 21, 2019, 1:41 PM Charlie Nelson via CnC-List < cnc-list@cnc-list.com wrote: > > It appears per list comments that it is OK to tighten my keel/centerboard > 'trunk' without putting her on the hard. Since I can reach most of the nuts > by removing the cabin sole, I figure its worth a try. I cannot reach the > bolts under the mast this way but I can probably get to most of the others. > My keel/cb trunk is pretty wide so there are 2 rows of bolts/nuts holding > it to the hull. > > My guess is that I have 8-12 pairs of bolts and those that I can see are > 7/8" diameter with nuts that are 1 1/2" across and appear to be stainless > steel. BTW, my keel/cb trunk and board weigh-in at about 5600 lbs per the > original specs. > > A quick internet search on torque wrenches, multipliers and torque values > with my bilge depth in mind indicates that I will need a 1 1/2" socket with > an extension of ~ 12 inches and maybe a torque multiplier, depending on the > torque required. > > List sources suggest torques of over 200 ft-lbs are required and most > common torque wrenches top out at 150 ft-lbs thus the multiplier. My quick > look at recommended torques vs. SS (18-8) bolt sizes indicates 193-195 > ft-lbs is recommended for my bolts which is consistent with values I have > seen on the list and the C&C photo album, although a little on the low end. > > OTOH, I might be able to use a bigger/longer torque wrench without the > multiplier. > > Either way, I am not certain of what drive size to either rent/borrow or > buy--and the cost is substantial if you go from the 'standard' 1/2" drive > to 3/4" or higher. > > Questions for the list: > > 1. Are my torque values ~ 200 ft-lbs within the ballpark? I seem to > remember some list recommendations at ~ 350 ft-lbs! > > 2. Also, what is a reasonable drive size to use? > > 3. Should I just go with a larger torque wrench (which will reach the > ft-lbs required without the multiplier)? > > 4. Any likely issues with not tightening the bolts under the mast until my > haul-out this summer? > > TIA > > Charlie Nelson > Water Phantom > 1995 C&C 36 XL/kcb > > > > > > > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
