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Keel Bolts and General Topics on Keel - Keel bolt Torque Settings
30 September 2015 - 19:33
#1
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Mark Seymour
Join Date: 28 September 2015
Posts: 5

Keel bolt Torque Settings
I have just bought a 1971 Swan 37 - the survey has suggested that the keel bolts be checked for corrosion and that they are tight enough.

Can anyone confirm the keel bolt torque settings for this Swan?

Many thanks

Mark
01 October 2015 - 13:27
#2
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the professor
Join Date: 02 January 2008
Posts: 1547

Dear Mark
Can give the recommended torque, but would like to know if the bolts are 3/4" or M20, the torques are slightly different. There are 17 bolts, probably matted over, and they need to be uncovered for verification of thread size and width across the nut flats = spanner size.
Kind regards
Lars
05 October 2015 - 14:19
#3
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mark seymour
Join Date: 28 September 2015
Posts: 5

Dear Mark Can give the recommended torque, but would like to know if the bolts are 3/4" or M20, the torques are slightly different. There are 17 bolts, probably matted over, and they need to be uncovered for verification of thread size and width across the nut flats = spanner size. Kind regards Lars

Dear Lars

Many thanks for replying to my post.

The heads are indeed matted over, I'll get the matting removed and find out the bolt size.

kind regards

Mark



08 October 2015 - 17:30
#4
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TAROT
Join Date: 05 February 2012
Posts: 23

Hi Marc, would be nice to let us know how the procedure for controlling the keelbolts has been going and what the results will be.
08 October 2015 - 18:36
#5
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mark seymour
Join Date: 28 September 2015
Posts: 5

Hi Lars

We have exposed the keel bolts and they look to be in a very good condition.

The studs are 18mm and the nuts 27mm.

See photos attached.

Santelia Keel bolt

Santelia keel bolt
09 October 2015 - 18:02
#6
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the professor
Join Date: 02 January 2008
Posts: 1547

Dear Mark
Thank you for the information.
Your dimensions confirm that the bolts are M18.
The recommended torque is 67 Nm with greased threads, and 98 Nm if dry.
If you prefer not to mat over the nuts they need to be locked in another reliable way.
The visible threads appear to be a little short, would it be possible to use a slightly thinner washer? The recommendation is that the bolt upper end should be at least flush with the upper side of the nut.
Kind regards
Lars
13 October 2015 - 14:44
#7
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mark seymour
Join Date: 28 September 2015
Posts: 5

Lars

That is extremely helpful - thank you very much.

I'll let you know if they were still at the correct setting after 44 years!

Kind regards

Mark
31 October 2015 - 20:36
#8
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Aernoud
Join Date: 26 April 2010
Posts: 33

L.S. how did you recognize the 17 bolts under glass/resin: where are they all located?

With best regards, Aernoud. "Croix du Cygne" NED1675, Swan 37 nr 34, 1971
02 November 2015 - 20:16
#9
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the professor
Join Date: 02 January 2008
Posts: 1547

Dear Aernoud
There are old records suggesting that there is 17 bolts. They should be visible, even when matted over, as small round areas protruding above the keel plank
Kind regards
Lars
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