Water in cylinders
#11
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Joined: Jul 2007
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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
#12
#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.
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.
#13
#14
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Joined: Aug 2005
Posts: 916
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From: Cudjoe Key FL
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.
#15
#16
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.
#17
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Joined: Jun 2004
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From: Omaha, Nebraska. Boat on the Mighty Mo! Longest river in the USA!




