Stringer Crack repair under Diesel Engine - SailNet Community
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post #1 of 21 Old 3 Weeks Ago Thread Starter
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Stringer Crack repair under Diesel Engine

I am way outside my knowledge zone so wondering if anyone has run into this problem. Looking for advice, experience, line of site to potential repair approach/costs.

During survey found a crack on one of the fiberglass stringers under the engine that runs entire length of engine bay (about 3-4 feet). Engine alignment is also a bit off though shaft is straight. That seems easily fixed but will need to deal with the crack at some point. Good news is that mounts are solid and engine doesn't move during backdown and stress testing. There is an appreciable vibration felt in aft cabin floor behind engine area.

This is on a Catalina 470.
Anyone run into this on ANY boat and what was the approach for repair? Need to get an idea of potential cost and time involved.

Thanks in advance!

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Re: Stringer Crack repair under Diesel Engine

Assuming there is room, you'd need to disconnect the motor from the shaft and jack it up. Then grind out the crack, fill and glass it back to original or better. Maybe add reinforcement.

The bigger question is why did this happen. Collision? Excessive engine vibration? Severe misalignment?

Obviously, you'll want to prevent it from recurring. However, the cause may reveal other concerns too. Vibration strong enough to crack a stringer would have done a number on the crank bearings and transmission too. They may work today, but excessive wear could shorten service life.


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Re: Stringer Crack repair under Diesel Engine

There isn't enough information to suggest an approach. Is the stringer itself cracked, or is just the gelcoat cracked, or is the tabbing loose? Is the stringer hollow, or cored, and what core?

Is the vibration due to this or a bad mount? Both could cause misalignment.

Cost and time could be almost nothing if it is just redoing a bit of tabbing. It could be much more if the engine has to be removed and the stringer replaced or rebuilt.

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Re: Stringer Crack repair under Diesel Engine

Are you interested in buying the boat? Or do you already own it?

It feels like you did the survey in the purchase process. If so, I would not proceed further. I dont know nuffin about boat building but theres red flags waving all over the place.

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Re: Stringer Crack repair under Diesel Engine

+1 on figuring out what caused this problem before you begin repairs.
Is this a structural member? Maybe I got it wrong, but I don't see the reasoning for having a stringer running fore and aft in the center of the bilge, between the engine mounting stringers. Is your hull that thin at that point that it needed the support of a stringer? Is it part of the keel attachment? Could it be a centerboard trunk?
A bit more info and some pics would make it easier to help you.

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Re: Stringer Crack repair under Diesel Engine

Good stuff from many of you. Unfortunately, I don't have a pic just yet. This was found during survey on a Catalina 470. Per early feedback form surveyor, the motor mounts are good and the engine didn't move around during backdown testing. Boat was hit by lightning over a year ago and all electronics replaced. No reported or visible hull damage was found from that. Still waiting on final survey report with pics. I believe this "stringer" does not have a wood core under the glass.

Will report back what is decided.
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Re: Stringer Crack repair under Diesel Engine

A 3-4 foot crack, assuming you mean structural and not cosmetic, is a big deal. Tread carefully.


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Re: Stringer Crack repair under Diesel Engine

He didn't answer the question if he owns the boat or not.

Going on ambiguity of other similar posters he does not own the boat but wants it cheap.... At his risk!

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Re: Stringer Crack repair under Diesel Engine

Quote:
Originally Posted by MarkofSeaLife View Post
He didn't answer the question if he owns the boat or not.

Going on ambiguity of other similar posters he does not own the boat but wants it cheap.... At his risk!
Technically, you are correct. I didn't answer the ownership question but strongly implied since I said this was found during survey... anyways... no I do not own the boat. This is a hot off the press, decision still to be made situation.
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Re: Stringer Crack repair under Diesel Engine

Quote:
Originally Posted by capta View Post
+1 on figuring out what caused this problem before you begin repairs.
Is this a structural member? Maybe I got it wrong, but I don't see the reasoning for having a stringer running fore and aft in the center of the bilge, between the engine mounting stringers. Is your hull that thin at that point that it needed the support of a stringer? Is it part of the keel attachment? Could it be a centerboard trunk?
A bit more info and some pics would make it easier to help you.
May have pics from my surveyor later in week. I do believe this is one of THE engine mounting stringers.
more to come...
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