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Old 23-01-2019, 16:22   #1
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hull cracks around strut and stern tube

Worried about some cracking around the strut and stern tube on my 1985 Catalina 27 which is on the hard.

We knew before the haul out that the prop shaft was low on the stern tube and we needed an engine alignment.
The cracks developed after a few weeks on the hard. The alignment has not been done. The plan is to do it on the hard and recheck it when in the water.

Could the cracks have been caused by me running the engine (Universal M 18) a few minutes at 1,200 rpm on the hard (with the correct liquid intake of course) while circulating Barnacle Buster and winterizing?
Could the engine vibration had caused the cracking while running with the boat on the hard?
The cracking is just outside the hull. No trace inside.
I plan to grind down the cracks and fill up with epoxy.

What do you think? Thanks.
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Old 23-01-2019, 16:35   #2
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Re: hull cracks around strut and stern tube

I agree, that doesn't look good. I really doubt that running the engine on the hard caused the cracks. Much more likely is the misalignment of the engine you mention. Are the cracks just in the paint? Or just in the gelcoat? Or deeper into the laminate?
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Old 23-01-2019, 16:52   #3
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Re: hull cracks around strut and stern tube

"Feb 17, 2012 Basically, the shaft log is cracking and developed a slight leak. ... I had a similar issue with the shaft log on my 1985 C36. ... It appears by your picture that the leaking stern tube on your boat may also be the result of the prop ..."

https://www.catalina36.org/forum/tec...shaft-log-tube


Dec 27, 2006 - My Catalina 30 is also a 1985 model. ... I would add a cracked stern-tube rto the list. Rare, but happened to me with my C27. Check to see if ..

https://forums.sailboatowners.com/index.php?threads/wet-bilge.83677/

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Old 23-01-2019, 17:12   #4
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Re: hull cracks around strut and stern tube

Quote:
Originally Posted by JimsCAL View Post
I agree, that doesn't look good. I really doubt that running the engine on the hard caused the cracks. Much more likely is the misalignment of the engine you mention. Are the cracks just in the paint? Or just in the gelcoat? Or deeper into the laminate?
Thanks, the paint is gone (soda blasting). The newly discovered cracks (see pics) are deep enough to be felt with nail and finger. My plan is to grind them down (up, I should say!!) as deep as they go and refill with epoxy.
As I said nothing visible inside.
Good plan?
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Old 23-01-2019, 17:22   #5
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Re: hull cracks around strut and stern tube

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Originally Posted by ferrailleur View Post
Thanks, the paint is gone (soda blasting). The newly discovered cracks (see pics) are deep enough to be felt with nail and finger. My plan is to grind them down (up, I should say!!) as deep as they go and refill with epoxy.
As I said nothing visible inside.
Good plan?

Can you lay some epoxy/glass on the inside to stiffen it all up?


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Old 23-01-2019, 17:52   #6
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Re: hull cracks around strut and stern tube

Those two areas are heavily faired with fairing compound right from the factory. If it was a brittle resin used in the fairing it may, just may be a cosmetic issue only.

Chisel away at the fairing compound til' you get to the laminate. If there are no fractures in the laminate you are good to re-fair.
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Old 23-01-2019, 17:55   #7
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Re: hull cracks around strut and stern tube

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Originally Posted by coopec43 View Post
Can you lay some epoxy/glass on the inside to stiffen it all up?


Clive
yes I could.... but more difficult access and work.... and wouldn't that be an overkill??
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Old 23-01-2019, 17:57   #8
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Re: hull cracks around strut and stern tube

Quote:
Originally Posted by boatpoker View Post
Those two areas are heavily faired with fairing compound right from the factory. If it was a brittle resin used in the fairing it may, just may be a cosmetic issue only.

Chisel away at the fairing compound til' you get to the laminate. If there are no fractures in the laminate you are good to re-fair.
thanks... tha't my plan: grinding instead of chiseling....
what do you recomment for re-fairing?
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Old 23-01-2019, 18:04   #9
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Re: hull cracks around strut and stern tube

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Originally Posted by ferrailleur View Post
thanks... tha't my plan: grinding instead of chiseling....
what do you recomment for re-fairing?
Use epoxy mixed with fairing filler. DO NOT use autobody filler (BONDO).
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Old 23-01-2019, 18:07   #10
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Re: hull cracks around strut and stern tube

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Originally Posted by JimsCAL View Post
Use epoxy mixed with fairing filler. DO NOT use autobody filler (BONDO).
I agree with Jim. You can mix your own but if not familiar with cabosil and microballoons it may be better to buy a tub of pre-mix epoxy fairing compound.
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Old 23-01-2019, 18:14   #11
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Re: hull cracks around strut and stern tube

Quote:
Originally Posted by ferrailleur View Post
yes I could.... but more difficult access and work.... and wouldn't that be an overkill??
Maybe? But maybe not......

I reckon this guy has done a beautiful job and I think he had the same problem as you (not sure).

I think it is worth a look at what he has done anyway.

https://www.sailnet.com/forums/gear-...be-repair.html

Clive
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Old 23-01-2019, 18:31   #12
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Re: hull cracks around strut and stern tube

Is it possible the cracks are the result from haulouts especially if the straps were directly under the prop shaft and strut area?
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Old 24-01-2019, 06:44   #13
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Re: hull cracks around strut and stern tube

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Is it possible the cracks are the result from haulouts especially if the straps were directly under the prop shaft and strut area?
Thanks.... no chance. The straps were property positioned. I was there with a schematic of the lifting position as recommended by Catalina.
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Old 24-01-2019, 06:54   #14
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Re: hull cracks around strut and stern tube

Quote:
Originally Posted by coopec43 View Post
Maybe? But maybe not......

I reckon this guy has done a beautiful job and I think he had the same problem as you (not sure).

I think it is worth a look at what he has done anyway.

https://www.sailnet.com/forums/gear-...be-repair.html

Clive
Thanks for the link.... very instructive. I hope the damage on my boat is not that bad!!
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Old 24-01-2019, 07:34   #15
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Re: hull cracks around strut and stern tube

The key issue in repairing this is to grind out the cracked material entirely. There is a good chance that the cracks go deeper than just fairing compound and gelcoat, into the first schedule of laminate. As you grind, occasionally wipe down with acetone which will reveal any remaining cracking.

If you find yourself grinding down into cracked laminate youíre going to want to repair/replace with biax cloth. After all you want the fix to be stronger that the (inadequate) original. I would even add an extra schedule of biax on the outside and fair it in.
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