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    Normal rust on 2011 Mercruiser?

    where do you live? Block cools at night, hot humid air condenses in the morning and engine sweats or get wet every day. That is a source of moisture. When I stored my boat outside in Houston one summer you would have thought someone squirted it with a garden hose every single day. Another...
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    interrupt switch disconnected

    My guess is your lower shift cable is binding. that is why its killing the engine when the shift interrupter switch is connected. The shift interrupter switch instantaneoulsy kills ignition when shifting from forward to neutral. If it is not connected then you pull so hard on the gear lever...
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    Water in lower shift cable

    I had the same thing occur on mine. My problem and I have no idea how it occurred but the sheathing on the cable had a very slight cut.
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    Rebuilt Mercruiser 140/3.0 doesn’t have enough power to plane

    I chased a similar headache for months. Valves floated I replaced valve springs. Engine developed a miss/knock. So removed intake cleaned lifters assuming one was stuck. Put back together noise jumped to other side. Ordered new lifters, no difference. In end I had cracked a spark plug...
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    Help with water in oil

    my guess your manifolds are leaking, either at manifold to riser connection or manifold rotted through on back side of exhaust valve.
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    mercruiser 5.0 head gaskets new felpro..not stainless steel?

    Use cometic gaskets. failpro sucks
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    Mercruiser 4.3 added 4qts Still below ADD mark

    Holy cow this is a fiasco along the same lines as my outdrive gasket extruding. wow
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    Oil Pressure Below Mercruiser Limits Per Manual

    I had 5 psig oil pressure at idle in a 3.0 liter once. Changed the oil and had 20 pig at idle. Oh that right the oil was 6 years old. That was 25 years ago and engine still running strong. I like the 20W40 suggesting may get you comfortable with your oil pressure.
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    Oil Pressure Below Mercruiser Limits Per Manual

    I chased a low oil pressure issue in a Roush 427R for months. Bearing clearances were good, before and after I replace them, lol, Super long story short the oil put relief valve spring was to short from factory. My symptoms were good oil pressure up to 4K rpm at 40 psi then it would drop off...
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    Mercury Fault Code 312 - Port side pre Cat oxygen sensor slow to respone

    What is your exact code. I cannot find the code for post catalyst o2 sensor slow to respond. Makes sense as again the post o2 sensors do not have the ability to change the oxygen fuel mixture so how could they be slow to repspond....
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    Help with water in oil

    I filled mine with used motor oil one year over winter. Pretty sure that winter it didn't corrode....
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    Help with water in oil

    I think the key (what do i know) is to keep the block full of water or antifreeze at all times, winter included! Oxygen content in water is neglible compared to air (oxygen, water, cast iron are needed for corrosion we remove one and corrosion stops). When the block is drained it takes a year...
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    Cap/Rotor aftermarket or OEM?

    Thanks!!!!!!!!!!!!!!
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    Mercury Fault Code 312 - Port side pre Cat oxygen sensor slow to respone

    Ok your issue is different did you say "port side post cat O2" ??? the only purpose for the after catalyst O2 sensor (in manifold after cat) is to tell if you cats are working!!!! Nothing else, hope you don't have a bad Cat as they are $$$$$. I told you guys once loose the Cats, get the...
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    Help with water in oil

    Wow, I used a 3.0 liter in saltwater for 32 years!!!!! Only had manifolds rot through. I don't know if true but was told cylinder number one is thin to make room for impeller so if a 3.0 liter rust through that's where it occurs. Mine never did. Flushed every time. Shocked you are having...
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    Engine replacement

    You would a complete fool to install a "new" block without brand spanking new manifolds and risers unless you are 1000% sure how old they are and you bought and installed them
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    Cap/Rotor aftermarket or OEM?

    Please post your parts number for you aftermarket cap.
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    350 Mag MPI chugging at higher rpms

    If its a catalyst motor could be anything. Do you have access to a Rinda diagnostic tool?
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    Engine replacement

    what caused the hydro-lock?
  20. S

    Small corrosion on the Sterndrive watter passage

    I would lightly use some emry cloth where O-ring seats and reassemble. That is the cleanest "used"outdrive I have ever seen
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