When transom assemblies leak

b_arrington

Well-Known Member
GOLD Sponsor
Feb 21, 2007
3,484
Setauket, NY
Boat Info
Back Cove 37
AB Ventus 9VL
Engines
Cummins QSC 8.3 600
For a couple years my father in-laws 98 270 DA has has a water leak in the engine room. We had a lot of trouble finding it, and he dealt with it by pumping and bailing the water out. The leak was worst when the boat was occupied and the aft was down a bit.

The yard mechanic was finally able to pinpoint a leaking Bravo 3 transom assembly. But my FIL waited a season before we convinced him to make the repair.

The engine was removed earlier this month, and the transom repair began this week. The pics below are what was found when the mechanic started the repair. It isn’t pretty.


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Here's what the salt does to the transom assembly suction tube. It’s crushed and collapsed. The boat would've overheated this year. That hole should be double the size. This is why through hull water intakes are better then drive leg intakes.

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Also the exhaust y pipe was severely compromised. It is supposed to have 4 heavy attachment bolts. 2 were gone. When the mechanic pushed on the pipe the remaining bolts broke free. He was amazed the boat hadn’t sunk yet.

We’re also making extensive repairs to the engine. Power steering pump and lines, alternator, all the hoses and pullies, cooling system parts, engine coupler, oil pan, etc. There was a lot of corrosion from salt water in the bilge. So far we’re up to about $7000 in parts. Full repair expected to be about $10k. But once done the boat will be in good shape again.
 
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Well it lasted about 20 years, but I still find this mind boggling. We don't know what the PM history of the boat has been. Maybe it was not properly cared for. However, I/Os are high maintenance by their nature. Sort of surprising the boat would continue to be used when it leaked so badly.
 
View attachment 67930 Well it lasted about 20 years, but I still find this mind boggling. We don't know what the PM history of the boat has been. Maybe it was not properly cared for. However, I/Os are high maintenance by their nature. Sort of surprising the boat would continue to be used when it leaked so badly.
He’s owned it since 2006/2007 and done all the specified PM. Before that it was basically a dock queen in the Mystic River. The owner used it as a floating man cave.

We tried for a while to get the repairs done, but there was some resistance, thinking the cost/benefit was off, and maybe they were going to stop boating.
 
This is the kind of thing that terrifies me as a first time buyer! :D

Best of luck to you and your FIL. Please do continue to share regarding the state of the transom and overall repair costs!

Mark
 
Bet you have a rotten transom as well.
Went down today and checked it, along with talking to the mechanic. There is one small spot where the plywood is slightly soft. It’s going to be repaired, but other than that the transom is good. Phew.
 
This is the kind of thing that terrifies me as a first time buyer! :D

Best of luck to you and your FIL. Please do continue to share regarding the state of the transom and overall repair costs!

Mark
As mentioned earlier, transom looks good with the exception of one small spot that will be repaired.
Here’s the transom opening.

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I went over to the shop today and got a few pics of the engine sitting on the floor.
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Alternator. Still works, but has some signs it’s starting to go. Being replaced along with pulley.
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Raw water circulator and main pulley on top. Bottom are raw water and idler pulleys. All being replaced.
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Power steer pump and pulley, along with piping on the back side. Being replaced.
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Front motor mounts. Being replaced.
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Back of engine. Engine coupler is original and has seen better days. The engine would have to be pulled to replace it so it’s being done.
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The oil pan is getting replaced too. Salt water was sloshing on it for a while, so why take a change of a leak? Exhaust manifolds and risers are good from a prior replacement.

The mechanics are also going the thoroughly clean the whole engine space. It’s oily greasy, and gross.
 
The mechanic is doing 4 this spring so far. Ours is the one that lasted the longest.
 

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