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1997 Pro Line WA has a leak

Old 06-09-2019, 03:16 PM
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Cool 1997 Pro Line WA has a leak

I have a 1997 Pro Line WA cuddy with original MercCruiser Alpha one stern drive. For the last four years the boat has had a water leak that I cannot find. The leak is significant. One day on the water and the water is up to the rear bilge pump. At the end of a day I can remove the drain plug and water pours out for several minutes. The boat has always been on a trailer and never overnight in the water so I don't know if the water is coming in with the engine running or not.


I have checked the bellows with a mechanic, they are fine. I have had someone else driving the boat and watched for water coming out of the engine, I don't see any coming in anywhere including around the 4 drain plugs. I looked around the rear transom, around the drain plug (i've used plumber's tape and and removed the bracket and resealed) no signs of water. I've replaced and or checked all drain hoses attached to the stern deck. I have a separate forward bilge, it is always dry. I have live well with a pump. The water is drawn in from the bottom of the boat. I have a clear view of that, there is no water coming in. I have no water in my oil and no water in my gas. No water in the stern drive oil. I have new exhaust manifolds and risers, no leaks around them.

This is not water dripping in from around a screw. It is much more water than that.

I am baffled. Can't figure out where the water is getting in. Any thoughts will be appreciated.

Last edited by Fishfull Thinking; 06-09-2019 at 03:19 PM. Reason: added text
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Old 06-09-2019, 03:31 PM
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Check each of your thru-hull fittings, particularly if they are not metal (mine are not, and will be replaced soon) for cracks and/or UV damage.
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Old 06-10-2019, 05:30 PM
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Check for spider cracks around keel
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Old 06-10-2019, 06:26 PM
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Check for bullet holes if you ever had an Eastern European wedding party on board.
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Old 06-10-2019, 06:49 PM
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RCL
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While it's on the trailer, either leave the water in it and park it on dry pavement and look for water coming out where its not supposed to or drain it at the ramp park it on dry pavement, put a garden hose in it and see if water comes out somewhere it's not supposed to. Also are you sure that the live well isn't overflowing into the bilge.
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Old 06-11-2019, 03:47 AM
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Cracked y pipe?
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Old 06-11-2019, 04:02 AM
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Rain water from a hatch?
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Old 06-11-2019, 04:02 AM
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Originally Posted by Darksails View Post
Cracked y pipe?
What he said.... About the only to check it is to pull the engine....
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