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23-01-2015, 04:39
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#1
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Registered User
Join Date: Dec 2010
Posts: 49
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Keel bolts and torque
My boat is back from repair. Had a keel damage after a grounding, so the keel was taken off, all the damage was repaired and the keel then boltet back in place.
Before mounting the keel i asked the workers how much torque they would use for the 19 mm bolts. "We will tighten them as much as we can" was the answer!! I told them NOT to do so, and found the proper torque for them, 26 kgm. I told them to use 26 kgm....they didnt, so now no one knows how tight they are. Hill Billy style i guess, and i fesr they are way to tight. A big guy with a 50 cm steel pipe did it, my guess is he did far more than 26 kgm.
The keel is now covered with fibreglass. What would be my next step?
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23-01-2015, 05:22
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#2
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Moderator Emeritus
Join Date: May 2008
Location: North Mississippi
Boat: 48 Wauquiez Pilot Saloon-C22 Chrysler Sunpiper- 19 Potter-Preparing to cruise w/my girl
Posts: 5,976
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Re: Keel bolts and torque
There's plenty of keelbolt torque threads to search...
Are you are saying that your bolts are now covered up with glass???
My rough guess is the Big Hillbilly did about 40 kgm ???
__________________
In the harsh marine environment, something is always in need of repair...
Mai Tai's fix everything... 
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23-01-2015, 05:29
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#3
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 47,200
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Re: Keel bolts and torque
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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24-01-2015, 06:34
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#4
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Registered User
Join Date: Jan 2015
Location: Mallorca
Boat: Dragon
Posts: 82
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Re: Keel bolts and torque
The correct answer hear is to dig out the glass and do it again. This will only play on your mind now. The truth is unless the keel bolts aren't bronze and were dry torqued you are probably fine. I'm going to assume that they are stainless...this would explain the glass over them.
If you do re torque the bolts make sure the washers are stainless too! I've seen mild steel washers used quite a few times...
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24-01-2015, 07:27
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#5
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Registered User
Join Date: Apr 2008
Location: out cruising again, currently in FP
Boat: Sailboat
Posts: 1,453
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Re: Keel bolts and torque
Quote:
Originally Posted by jesperht
"We will tighten them as much as we can"
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Here is what I got from my boat builder for 1-3/8 keel bolts:
Quote:
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We are sorry that we do not have the torque specs for the keel bolts for you. When we installed the keel bolts on board, we usually tightened the keel bolts utmost till we could not tighten anymore.
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24-01-2015, 07:40
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#6
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Registered User
Join Date: Jun 2014
Location: Up the mast, looking for clean wind.
Boat: Currently Shopping, & Heavily in LUST!
Posts: 5,629
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Re: Keel bolts and torque
There are standard tables (which have been around since my Grand Dad was an idea) as to how much torque to apply to a fastener of a specific; hardness, alloy, diameter, & thread. They're not hard to find, it's just this gent (& I use that word VERY loosely here) either has no idea said info exists, & or, is too lazy to spend 5 min looking it up online. Even though I'm Certain that they have said data tables in many locations in any decent sized yard.
That fiberglass overtop of the bolts thing makes me Real uneasy. Not because of what that kind of environ can do to stainless, but rather, because it has me concerned that they might have done it to cover up some type of (possibly grievous) error & damage on their part. Like that maybe overtorquing the bolts did some damage.
I'd want to know, & with a strong preference to it being on their dime.
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The Uncommon Thing, The Hard Thing, The Important Thing (in Life): Making Promises to Yourself, And Keeping Them.
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24-01-2015, 09:53
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#7
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Registered User
Join Date: Apr 2011
Posts: 106
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Re: Keel bolts and torque
I'm betting he means that the keel to hull joint was fiberglassed over. Not the keel bolts...?
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24-01-2015, 10:28
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#8
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Registered User
Join Date: Dec 2010
Posts: 49
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Re: Keel bolts and torque
Sorry, there are no fiberglass over the bolts, but where the hull and keel meets. My concern is that when they are overtightened the bolts have lost some strenght , if i ex ground the boat. Am i being overconcerned?
Sorry for my bad english...
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24-01-2015, 10:37
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#9
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Resin Head
Join Date: Aug 2007
Location: Seattle WA
Boat: Nauticat
Posts: 7,205
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Re: Keel bolts and torque
Quote:
Originally Posted by jesperht
Am i being overconcerned?
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Probably. Unless the Big Hillbilly looked like Schwarzenegger and/or the pipe was four feet long.
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24-01-2015, 10:48
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#10
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Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 25,151
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Re: Keel bolts and torque
My guess is it would be pretty hard for a man to overtighten a 3/4" bolt.... especially amongst the floor boards of a boat.
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard
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