I replaced 7 of the 9 keel bolt nuts and washers. Unfortunately, I'm unable to budge 2 of the nuts despite generous applications of Kroil for a couple of weeks in advance and two shots on each with Freeze Off, tapping etc. and a 25" breaker bar and they won't budge. . Also tried using my impact screw gun on one hoping the shocks might coax it but, the 1/2" adapter for the socket just twisted off after a short while. Fortunately, they're #4 & #5 counting the forward keel bolt in front of the mast as #1 so, these are very accessible.
I'm guessing my only option is a nut splitter. The bad news is I've been unable to find one large enough for a 1-1/8" nut. Best I can find is 27mm which is a .062 undersized. Thinking if it won't squeeze on I could probably grind a little off the crowns of each facet to get the 62 thousandths.
I can't imagine I'm the first to encounter this so, anyone lick this one? if so, what worked for you assuming Freeze Off and expletives weren't the answer.
Thanks in advance for any assistance
Can't help you on how to remove (other than heat, perhaps), but curious, why the need to remove/replace?
Quote from: Noah on March 24, 2019, 07:19:03 PM
Can't help you on how to remove (other than heat, perhaps), but curious, why the need to remove/replace?
Knda reluctant to use heat in the bilge. Remove / replace to replace washers, re-bed & torque to spec.
Hi Bill
Why reluctant. Is there not clear access? Pix? Very thin pencil torch. Heat/cool/penetrate/repeating helps break the bond.
Dremel a deep thin slot in the nut, then wham with a cold chisel to split it.
What are you rebedding? Dropping the keel? Are you leaking?
Some "nutty" ideas:
http://www.cruisersforum.com/forums/f54/completely-seized-nut-on-engine-mount-215805.html
Ken,
I like your suggested process plus, if it fails, i could still go with a splitter. I guess I'm hesitant with heat near the floor of the bilge but, a pencil torch should give me good control.
Noah,
Changing for the following reasons: Some leaking as shown by a couple of small rust drips down the keel over the winter. I haven't been able to re-torque every nut for the past 3 winters since I got her. I saw some of the washers had corrosion and after removal I learned two were very severe and I'm really glad I decided to do this part now. I plan on dropping the keel next winter and ripping out the wood in the keel stub. Per the drawing from Catalina, I'm assuming that also means removing / rebuilding the mast step too.
Stu, thanks for the link.
Bill
Cut a hole in a heat/flame resistant sheet and lay over the keel bolt.
Bill—I am a Calif. guy, but you might rethink your "will do next winter" timeline. I would think that sort of work; dropping, removing/replacing keel stub, doesn't lend itself to be done in the cold of winter. Resin work is problematic in the cold.
Bill : As Ken mentioned - a Dremel tool will do wonders!!
A thought
Quote from: Noah on March 25, 2019, 12:08:57 PM
Bill—I am a Calif. guy, but you might rethink your "will do next winter" timeline. I would think that sort of work; dropping, removing/replacing keel stub, doesn't lend itself to be done in the cold of winter. Resin work is problematic in the cold.
Yeah, thanks for helping me look down the road. i figure on doing the new fiberglass work in the Spring whenever it's warm enough and the launch date will be pushed however long is needed. I've read there are some epoxies that can manage "cooler" temperatures but, I'll get in to the details when needed. I've never done fiberglass work so, I'll have a lot of reading to do and buying a few beers for friends that have. The bilge is probably a good place to learn knowing I need strong, not really pretty.
I second the dremel tool.
Perhaps cutting a slit as far into as much of the nut as possible would assist in the application of PB Blaster etc. and enough to allow one of these to work for you.
https://www.allhailexpress.com/products/tools?utm_medium=cpc (https://www.allhailexpress.com/products/tools?utm_medium=cpc)
Following because I am considering refinishing the bilge during our next haul out.
Paul
I plan on trying the torch / dremel approach this weekend
Very pleased to share that I didn't need to cut the 2 keel bolt nuts off with a dremel after-all but, was prepared to. I thought I'd share what worked:
Heated the nuts up to around 350 F or so. I have an infrared thermometer
Let them cool down to ballpark 100 F
Spray for 20 seconds with freeze off
Wait a minute then hit the nuts on the side with a hammer a couple times. Didn't kill it, just a couple of decent shots to shock it
25" breaker bar took then off without difficulty
Once they started to move I liberally lubed and took my time turning them off to make sure they didn't stick
:clap