FISSURE AT KEEL/HULL JOINT


I detected a 1/64" fissure between the bolt-on keel and the hull along the aft-half of the joint on my 1959 Triton.  Is this a serious problem?  One opinion I received was that it is a common thing...
Boatyard guy says it's no big deal: half of the boats he hauls have similar cracks.  He suggested tightening the bolts or shimming under the Bolt-head to close the gap.  He added that most folks simply fill w/ putty and fair it over prior to repainting.

SOME FEEDBACK

Bill Bell, #41, KIALOA

Dear Jeff - forget about the crack. In boats with external ballast, the difference between the coefficients of expansion in lead and fiberglass are always on display. You can do a bit of puttying in the crack but don't give it a thought. I have been sailing #41 with the same external ballastfor some
35 years. No sweat. By the way, your boatyard guy has given away the fact that he is not "up" on Tritons. All Tritons have the bolts glassed over; you can't tighten them up or shim under the heads.

Tim Lackey, Glissando

That does not sound like a serious problem.  1/64" should be nothing to worry about; cracking along the joint between external ballast and fiberglass is indeed a very common issue, although usually seen on fin keel boats.  If you can get to them, you could consider tightening the keel bolts (mine
are glassed over).

???

Sounds serious as hell.  The bolts may be corroded through.  The keel could fall off in heavy weather.
Xray the bolts.  Dig it open and put in new bolts.  Patching a crack with epoxy or paste will only hide  the flaw and not assure the strength.  But what do I know.

Jeff Maher, #(30)
(UPDATE!)

I got my 59 Triton transported to my place yesterday (WOOHOO!) and solved the fissure thing: for ten years the keel has been improperly laid-up--the forward blocking was correctly placed under the bolt-on, while the aft block was beneath the hollow add-on portion of the keel.  Thus set, the walls of the add-on deflected outward as a result of the stress underneath (not much pressure--good thing) which caused the leading-edge of the joint to withdraw where it meets the lead bolt-on. The joint at that point  feathers over the lead a few inches, only, likely, to exclude water  from reaching the long shanks of the attaching bolt which passes entirely THROUGH the hollow part and then into several inches of solid plastic.  The upper head of the bolt terminates in the bilge where it is glassed-over.  Good News.
 
With the pressure relieved, the walls of the add-on immediately returned to their former contour, and the joint closed.  I must simply re-feather the joint, and all is well.