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Old 02-23-2021 | 03:48 PM
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Before you reassemble, have the mating surfaces properly decked (machined)..... in the meantime, you can check the mating surfaces with a straight edge and feeler gauges. If the surface is way out of wack, you can create leaks under the gaskets as proper crush specs can only do so much
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Old 02-23-2021 | 04:30 PM
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Originally Posted by SB
#7 water to cylinder for sure. Between #5 and #7 cyl could have been letting a little combustion leak between themselves.

Also remember, a misfiring cylinder or two can suck water back like a 20yr old can beer on Thirsty Thursday on campus.

Factory heads or aftermarket ? Reason for asking, some aftermarket heads have wider combustion chambers and require a larger bore head gasket, even if larger than cyl bore.
Hey Scott, long time no talk. Factory 502 (088) heads.
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Old 02-23-2021 | 04:31 PM
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Originally Posted by BillK
Just curious ..... was that the Fel Pro marine gasket ? How many hours on it ?
By the looks of it I believe so. I just bought the boat this summer so I only know what I was told. Seller said the engines were rebuilt 50 hours ago but by the looks of things he lied.
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Old 02-23-2021 | 04:49 PM
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Originally Posted by onesickpantera
Hey Scott, long time no talk. Factory 502 (088) heads.
Be sure to check the exhaust ports thoroughly on those 088 heads. You may need to have them pressure tested. They are known to rot where it is hard to see with naked eye. BTDT. Just another idea in the process of elimination. Good luck.
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Old 02-23-2021 | 04:58 PM
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Originally Posted by sonicss42
Be sure to check the exhaust ports thoroughly on those 088 heads. You may need to have them pressure tested. They are known to rot where it is hard to see with naked eye. BTDT. Just another idea in the process of elimination. Good luck.
Thanks. I will have someone much more knowledgeable than myself going through the heads.
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Old 02-24-2021 | 09:13 AM
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One other source of water that I encountered - ouch. The Merc belt-driven combo fuel pump/seawater pump can fail and water can be sucked from the failed fuel pump into the intake manifold through the vacuum line.
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Old 02-24-2021 | 12:48 PM
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Originally Posted by Revelocity
One other source of water that I encountered - ouch. The Merc belt-driven combo fuel pump/seawater pump can fail and water can be sucked from the failed fuel pump into the intake manifold through the vacuum line.
That is not a vacuum line. If there is a seal failure the fuel is supposed to be dumped into the intake.
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