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Old 04-03-2013, 08:51 AM
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Default Describe the sound of a wet transom....

Howdy......when I occasionally tap transoms I'm not sure what I'm hearing. I expect a "thud" if it's wet, and a crisp solid sound if dry, but this is only what I imagine I should hear. Sometimes the sound is uniform over the entire transom, so I don't know if the whole thing is wet or dry.

Any clarification on this procedure would be appreciated. Thanks...........
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Old 04-03-2013, 09:01 AM
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slosh slosh is a dead giveaway, or fist makes a dent when hitting, moisture meter or trained professional
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Old 04-03-2013, 09:04 AM
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hard tap (like on block steel) = ok
dull thud, no noise = problem...

but yeah...surveyor M Meter is the best way...
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Old 04-03-2013, 09:06 AM
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on your own boat? if you suspect it to be wet drill a few small holes here and there.
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Old 04-03-2013, 09:09 AM
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I would challenge the notion that you make that determination with 100% accuracy based on the sound it makes.
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Old 04-03-2013, 09:33 AM
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I would challenge the notion that you make that determination with 100% accuracy based on the sound it makes.
Yes, that's kind of what I'm getting at......just how much can I tell by tapping? Not my boat. Can't drill it. Clearly, if I hang onto the motor and I see the transom flexing, well, that's a no-brainer.

The boat I'm going to look at is a 1987 Hydra Sports 25, with a 250 Yammy. But that's another thread.....
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Old 04-03-2013, 10:03 AM
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You can tell when the core is delaminated or completely rotted out (no core to dampen the sound); it will still sound solid if it's intact but just wet.
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Old 04-03-2013, 10:14 AM
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Drill very small holes from inside under typical suspect area like motor mount bolts, drain plug, scuppers, etc.
You can also just remove some hardware and check. Drain plug fitting, scuppers, etc. then reseal.
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Old 04-03-2013, 12:33 PM
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The sound difference will be about like finding a stud in drywall, tonk, tonk, thud, tonk, tonk. Nothing is fool proof without exposing the wood, but sounding is a cheap way to start ...
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Old 04-03-2013, 01:13 PM
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The bounce back is just as important as the sound. A wet and/or delaminated panel will not bounce a phenolic hammer (or phenolic screwdriver handle) back at you, but a cored, intact panel will. Also, while tapping place your other hand on the fiberglass near where you tap. The resonance and vibration felt through your fingertips will tell you a lot. Practice on the areas of the boat where you know what's beneath the surface.
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Old 04-03-2013, 03:32 PM
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Quote:
Originally Posted by btravlin2 View Post
Howdy......when I occasionally tap transoms I'm not sure what I'm hearing. I expect a "thud" if it's wet, and a crisp solid sound if dry, but this is only what I imagine I should hear. Sometimes the sound is uniform over the entire transom, so I don't know if the whole thing is wet or dry.

Any clarification on this procedure would be appreciated. Thanks...........
If you have any doubts, drill a small hole like 1/16 or smaller inside. Most transoms are two layers of 3/4 plus the skins. My outside skin was 1/2 glass and cloth. Middle skin was about 1/16 glass and cloth. Inside skin was 1/8 or greater. If water comes out, you are screwed! If you can't get inside try outside and if water comes out you are still screwed. If not, squeeze 5200 back into hole or glass over it. Look for places of possible water seepage into wood core like around transom door assemblies or where cap and bottom meet. Mine was coming in under cheep ass moulding around transom door.Over time opening & closing door fatigued the area. Owner would have never seen it unless removing moulding. Over time water rotted starbord transome area. Luckily, I was able to save rest of transome. On I/Os you will have to pull motor. THAT SUCKED! If yours is OB, pull motor and drill out old wood. 5/8 long shank wood drill bit and air hose work great.!!!! You might be able to pour new transome. There are kits! I wasn't so lucky and at 6'3" 250 lbs, getting my fat butt inside a 2950 Prolineengine compartment to cut all the rotted wood out has been nightmarish. I have air chizels too. But, it still sucks! Good luck.
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Old 04-03-2013, 03:45 PM
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Lay 35 one hundred dollar bills on a piece of drywall and tap it with a phenolic hammer.

That's pretty much what it sounds like to the boat owner. > the first part anyway...
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Old 04-03-2013, 04:06 PM
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Quote:
Originally Posted by Fiberglass1 Inc View Post
The bounce back is just as important as the sound. A wet and/or delaminated panel will not bounce a phenolic hammer (or phenolic screwdriver handle) back at you, but a cored, intact panel will. Also, while tapping place your other hand on the fiberglass near where you tap. The resonance and vibration felt through your fingertips will tell you a lot. Practice on the areas of the boat where you know what's beneath the surface.
This is one of those things that is really hard to describe or teach, but this is the best description I have seen. I too use a phenolic screwdriver handle to tap, as I think you can feel alot through the blade. (the blade acting as the handle in this case.)
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Old 04-03-2013, 05:36 PM
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[quote=btravlin2;5520892]Howdy......when I occasionally tap transoms I'm not sure what I'm hearing.

Do you check transoms for a living or is this just for enjoyment. If your checking random transoms for pleasure please don't start drilling holes.

In all seriousness this has to be taught or learned first hand, not by someone trying to describe a sound on the internet.
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Old 04-04-2013, 06:15 AM
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drill it and be sure. a 1/8 inch hole inside and low in the boat will not harm a thing. then refill the hole with a bit of filler and coat with resin.
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Old 04-04-2013, 06:45 AM
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I always thought the sound of a wet transom was crying and cursing.
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Old 04-04-2013, 06:57 AM
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Rust stains appearing around engine bolts, ladder bolts, transducer screws also indicate water getting in.
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Old 04-04-2013, 07:23 AM
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Sounds like he's looking at someone elses boat so drilling is not an option. Hire a good surveyor if you have any doubts. A few hundred dollars lost up front could save you several thousand down the road.
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Old 04-04-2013, 10:20 AM
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Squish......Squish
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