Water in CYL #8 |
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Lakeview
Senior Member Joined: January-06-2004 Location: Branchville NJ Status: Offline Points: 247 |
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Posted: July-10-2017 at 11:26pm |
85 Ski Nautique resurrection,351 W,engine has 900 hrs but when changing out old thermostat, there were signs of an overheat, and I think the original thermostat was still in the engine,Hooked up hose pressurized engine, cranked over and started, ran for two minutes and shut down, attempted restart and had hydrolock.#8 cyl pumping out water.
Pulled the head today, off to the machine shop tomorrow.I did do a leak down test on the cyl and could hear air escaping thru intake carb bores. *** need a lesson on how to load photo's |
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Lakeview
1992 Barefoot Nautique 1967 Barracuda SS 1967 Chris Craft Cavalier |
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Dreaming
Platinum Member Joined: May-21-2010 Location: Tacoma, WA Status: Offline Points: 1870 |
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water in the cylinders often comes from the exhaust manifolds being bad. Certainly having an intake leak could contribute if the issue comes from a blown head gasket or cracked head. I would check the manifolds though, they are not cheap, but are an important part of the cooling system.
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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I agree that it is most likely the exhaust manifold, either way you should be able to see a source now that you have the head off, its either a crack in the dome of the head, crack along the cylinder walls, evidence of a blown out head gasket, or signs of water and rust coming from the exhaust manifold. Give everything a good looking over before you start investing in that head.
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3735 |
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Study the old head gasket very close. If it failed you will see damage and signs of leakage.
If it was formerly overheated you can mic the gasket at many points and see exactly wear the overheat happened. When overheat happens the head will swell in the hot areas and crush the gasket slightly. When it cools off the head shrinks back to size but the gasket remains crushed in the overheat area. It may measure .004 small in the crushed area. Those areas will fail when you run the engine again. The head may also have warped or Cracked if it got hot enough. Separately if a marine exhaust manifold goes bad it can allow water to reach a cylinder. Mark |
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