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    ANOTHER WATER IN OIL QUESTION

    ok heads and intake back on . pressurized coolant system and its now hissing coming from rear port side head . If i put finger over upper most hole in back of head the sound will change. not intake. not starboard anywhere, not dip stick. i would think this would mean crack in head (that...
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    Head gasket orientation for 4.3 Vortec

    I have MOTor GASKET MO 115. See pic. Should the flatter side with the extra metal go on the block ?
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    ANOTHER WATER IN OIL QUESTION

    Yes it is
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    ANOTHER WATER IN OIL QUESTION

    It definitely would have shown a bad head gasket (bec it was compromised in a couple spots) when i did the pressure test of the cooling system I heard significant air in cylinder 2 spark plug hole and less in #4, not the valve covers or from dip stick
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    ANOTHER WATER IN OIL QUESTION

    yeah probably right, just not trying to pull the motor again , but its looking like that or put back together and start all over at the cost of gaskets and time. then pr test water system again. BTW 2 bad valves.. No cracks in the galley or any of the usual places between pistons, stud...
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    ANOTHER WATER IN OIL QUESTION

    unfortunately i did not.
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    ANOTHER WATER IN OIL QUESTION

    No cracks in the heads but The fairly new (maybe 5 hours on them) Marine head gaskets on same side was burnt and obviously shredded in a couple small spots. Seemed to happen right after putting in 93 octane and hearing pinging with WOT( advance timing i found after rechecking with light) (i...
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    ANOTHER WATER IN OIL QUESTION

    Is it possible with the motor running and the exhaust manifolds getting water in them (which definitely is happening), the (tuliped)valve creates a vacuum that sucks water into the engine where as it gets in to the pan quickly while running? Im thinking there's a crack somewhere near #2...
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    1992 3.0L I hear air leak in #4 cylinder

    As advised by Rick. This isnt the issue for this situation. Sorry for any confusion.
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    1992 3.0L I hear air leak in #4 cylinder

    My basic understanding is when a valve warps inward and can no longer seal properly. It appears to be sucked into the valve seat. Usually from advanced timing situation with overheating. I'm sure others can chime in with better description. Besides RICK STEPHENS who has vast more experience in...
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    1992 3.0L I hear air leak in #4 cylinder

    You're probably correct but Why do you say valves arent the problem. Is it bec the pressure test he did indicates the block or head water jackets? I n my case Machinist said the tuliped valve could create a vacuum and draw water into motor.
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    Aluminum risers

    Primarily salt water at this point. Makes sense. Any opinion on best low price risers for wet system.
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    Aluminum risers

    I need new risers and i found aluminum for $99 each.. Are they inferior . I would think aluminum is better ?? Marine Engine Depot. 4.3L_262ci - 5.7L_350ci Mercruiser Style Aluminum Exhaust Riser.html
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    1992 3.0L I hear air leak in #4 cylinder

    As i just recently found out one thing you can add to the list of possible issues is that the intake valve for that cylinder has tuliped.
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    ANOTHER WATER IN OIL QUESTION

    Exactly what he said at the machine shop. Fortunately its fixed, unfortunately too late. Valve job being done now. trueing mating surfaces, pressure and magniflux testing if necessary. Both ex manifolds are cracked, bubbles with pressurized water in test on bench.
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    ANOTHER WATER IN OIL QUESTION

    So heres a new one on Me. Just took heads to the machine shop to get leak tested and he found where 2 of the the intake valves (for 2 &4) on the starboard head were actually bending inward (tuliping), which he said can cause a vacuum pulling water into the cylinder.
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    ANOTHER WATER IN OIL QUESTION

    Nope. Manifold held acetone all night and no hissing when pressurized to 20 psi.
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    ANOTHER WATER IN OIL QUESTION

    gotcha and Thank you so just did another pr test on coolant passages and forgot to let the water out from the last trial run that failed as mentioned above.. so what happened is a bunch of water shot out from the front of the intake manifold into cylinders intake ports when i let the water...
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    ANOTHER WATER IN OIL QUESTION

    Just found a breach in the port side exhaust exh manifold. Not big but was fizzing up on 2nd port like a sprite but smaller bubbles. Im sure enough to let water in at running temps with expansion.. Any input is appreciated. Going to look at heads and intake manifolds now. going to do another...
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    ANOTHER WATER IN OIL QUESTION

    How would the water get in the one exhaust manifold only. I ran it several times this summer after a tear down for water intrusion by carb from dog house off and cover sitting on the flame arrester during a few rain storms.. Didnt know this was possible so I tore it down looking for the usual...
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