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Old 04-06-2002, 10:45 PM
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We got a problem with a buddies boat. He has a 502 that filled up with water. Salt water. We are not sure were the water came from. He called me today and said that he thought his starter was bad so I told him to make sure he did not have a hydolock. Well he pulled plugs and he has a MAJOR problem. Cylinder was full of water. 2 and 6 had some water but not a lot. On the other side there was some water but not a ton. The intake was recently done as well as the riser on the side of the engine that seems to have taken it the hardest. My first question is, how does he go about diagnosing the problem. Second what should he do now that the water has been sitting in there for a week or so and no doubt causing rust?

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Old 04-06-2002, 11:16 PM
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Jon, all I know is that if salt water got past the pistons, you better pull the motor apart. Don't even try to turn it over. Just pull it out and do it right.
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Old 04-06-2002, 11:18 PM
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Ron you think I am concerned with pitting with the salt water being in there for that long. What is the worse that can happen however? The engine will just have either less oil preasure or power NO??????

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Old 04-06-2002, 11:43 PM
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Was it winterized properly? This time of year you always see this. Otherwise manifolds or risers are the most likley. I've seen intake manifolds with holes eaten through the water passage but if it has been replaced recently that's unlikley. Also it's possible the engine just sucked water in through the exhaust either when shutting it down or slowing down to quickly. Get the water out and the engine running as quickly as you can, if it's not too late. Watch out for stuck valves which result in bent pushrods. Good luck.
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Old 04-06-2002, 11:52 PM
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Bowtie the boat is in Cali and gets used all year long. We were thinking along the lines of a bad intake as I was just told all cylinders had water in them!!!!!
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Old 04-07-2002, 12:05 AM
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In that case I would go for intake also. Especially if it's an aluminum automotive type. Why would anybody want to boat all year round. What do you have to look forward to.
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Old 04-07-2002, 12:12 AM
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My buddy had the same thing happen to his. A new aluminum intake had a manufactering flaw. Got water in two cyls and bent the pushrods.
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Old 04-07-2002, 11:14 AM
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Would the intake fill it up that bad? All cylinders? Seemingly on shut down?

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Old 04-07-2002, 12:13 PM
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He's got Hell! pull it out and appart before he hurts something else....my.02
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Old 04-07-2002, 12:13 PM
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Audio,

How did he come to try and start the engine? Was if with muffs on a garden hose, or at launch time? Backing down the ramp too fast can cause this problem.

Nonetheless, I would drain the oil, preferrably through the drain plug, change filters and fire it up. Then you can collect the necessary facts. You must properly define the problem before leaping into action.

BT
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