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Looking for tips for removing bolts |
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Riley 
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Joined: January-19-2004 Location: Portland, ME Status: Offline Points: 7946 |
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 Topic: Looking for tips for removing boltsPosted: August-09-2019 at 5:31pm |
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We've got a project coming up for removing some 1/2" SS bolts that attach an alloy bracket to the transom. I've read that galvanic corrosion is a possibility, even between the SS bolt and nut, and it's easy to strip the SS bolt. Any tips on what to do before putting torque to them?
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21107 |
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Posted: August-09-2019 at 5:46pm |
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Are you thinking of galling?
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Riley
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Posted: August-09-2019 at 5:51pm |
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I don't know what it's called, but the thread strips out and then the nut won't come off. We'll put heat to it, but didn't know if there is a tried method.
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Orlando76
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Joined: May-21-2013 Location: Mount Dora, FL Status: Offline Points: 3108 |
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Posted: August-09-2019 at 5:56pm |
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In my experience the 5200 behind the plate was more of a surprise and a nightmare to deal with. Do you know there’s a problem or just speculating? Permanent removal and trash or thinking to re-install?
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1976 Ski Nautique 351 Escort 1993 Ski Nautique purple and black 351 HO PCM |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Posted: August-09-2019 at 5:57pm |
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Bruce,
What you are seeing is galling. Once locked by galling you'll need to cut the bolt. It's very common with SS nuts and bolts if a anti seize compound wasn't used. |
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Riley
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Posted: August-09-2019 at 6:01pm |
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I believe what was used on these was locktite. I don't know that there is a problem, just trying to be prepared. We are changing the swim platform brackets. Each transom mount is held on by 2- 1/2" bolts. If they need to be cut, that will be bad.
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8122pbrainard
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Posted: August-09-2019 at 6:13pm |
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Bruce,
Brute strength also works. You give the bolt enough torque and it will break. I've done it many times when SS bots and nuts gall up. |
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Orlando76
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Posted: August-09-2019 at 6:14pm |
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Please support The Cystic Fibrosis Foundation
1976 Ski Nautique 351 Escort 1993 Ski Nautique purple and black 351 HO PCM |
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Riley
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Posted: August-09-2019 at 6:25pm |
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There no way to cut it from the transom, just behind the tank. We'll know what we're getting into once we take the boat apart and see what we have to work with. I was reading about SS bolts and alloy in a boating magazine awhile back and was trying to get prepared for the worst. If the bolt is seized and can be broken off that would be fine.
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8122pbrainard
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Posted: August-09-2019 at 6:36pm |
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Bruce,
One of my very early careers involved installation of food processing equipment. One piece was a pasteurizer/cooler which was basically a large tank bolted together to hold water. Due to it's size, it was sectional with thousands of SS bolts holding it together. Every once in a while a bolt and nut would seize and the easy correction was to pour on the torque to break the bolt. Doing it by hand is best since an impact wrench is too intermittent. Constant torque is needed. They were 3/8" bolts. |
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Riley
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Posted: August-09-2019 at 7:03pm |
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OK, what I am fearful of is the threads breaking away from the bolt and the nut spinning, but maybe that's not likely? Didn't know if there was a magic formulor to hit the bolts with first. Thought I'd ask. Probably shouldn't read boating magazines.
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8122pbrainard
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Posted: August-09-2019 at 7:21pm |
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Not likely for the nut to just spin. When galled, the nut and bolt become one.
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MrMcD
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Posted: August-10-2019 at 3:26pm |
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A mix 50/50 of Acetone and Tranny Fluid, std ATF has proven to penetrate and help loosen bolts better than PB Blaster or Kroil. Squirt some on the bolts and let it soak in. It can penetrate into the threads. Heat it and apply more. Add a little each day for a couple days.
Then try to take your stuck bolts off. I mix a quart of this up in an old platic oil quart container and then use a small 2 oz container with a squirt head to apply the stuff. If this does not work you are out of luck with those bolts. I should mention, my quart of this is 3 or 4 years old and is still good. With a cap on it the acetone has not evaporated so it ages well in a good container. I was not aware of stainless bolts having issues with aging. I have always applied antiseize to aluminum threads but never to stainless. Thanks for the tip. |
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Riley
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Posted: August-20-2019 at 4:38pm |
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Turned out to be easy job. Nuts were barely tight and there was no galling. I should quit reading the Boat Dr. in Boating Magazine. I ordered new custom made platform brackets from Alloy Marine. They are excellent to work with and their prices are reasonable.
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MrMcD
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Posted: August-21-2019 at 5:26am |
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Curious if you soaked the bolts prior to removal?
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Riley
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Posted: August-21-2019 at 11:02am |
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No, I was about to spray them and my son thought we should just wrench them and see what happens. To my surprise they didn't seem even tight. They came right off.
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MrMcD
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Posted: August-21-2019 at 10:15pm |
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Got off easy, better go buy a lottery ticket while your luck is good.
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Riley wrote: