1990 - 5.0L Mercruiser taking on water.

sethhoffman6984

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Aug 1, 2010
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My family recently bought a 1990 21' Mariah Cuddy with a 5.0L V8 Mercruiser inboard engine.

The boat sat in a warehouse for 4 years before we bought it. It had been winterized prior to being stored. The boat is in very good condition given it's age.

The first time we took it out we notice the bilge pump coming on after running down the lake or when pulling a tube/skis. The bilge pump would take out ~2-3 gallons of water after each time we would get up to speed and come to a stop. Obviously this concerned us, being that taking on that much water that rapidly.

We checked to make sure the plug was 100% secure after putting the boat back on the trailer, it was tight and not leaking. After taking it to the local boat mechanic they said that all the seals and bellows looked and tested fine, and swear up and down that's not the problem.

Long story short, the mechanic can not find the problem (after several visits) and we are out of ideas. We have had the boat out two times since and it does the same thing, sitting still at the dock little to no water comes in, from starting to about 2 hours in there is little to no water, but after a few hours of running we start to take on the amount mentioned above.

We are stumped...Any help would be greatly appreciated. We are new to boating and may be missing something obvious.

I should mention that our boat has a shower system on the swim deck that we have disabled at the shower end, the water pick-up under the boat is open, the mechanic has looked into a leak on the internal plumbing to find nothing.
 
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