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    Drive oil

    Yep. You can put any oil in your drive. Oem recommended is high performance straight 90 wt. Ymmv
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    1984 228 305 carb problem

    You agree that a vacuum leak decreases rpm?
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    WOT for 20min and engine bogs.

    Thinking SD means the ignition sensor for a thunderbolt system. Is located in the distributor, latest style oem has three wires and is fully potted. It sends a signal to the module on/off hall effect to fire the coil. New age points in effect.....
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    1984 228 305 carb problem

    Can't know enough about engines and boats. Glad to hear your advice seek on this forum is finished. I do provide factual information based on what I know, have experienced, and confirmed in real life about boats, boating and most important science and life on planet earth After your adventure...
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    1989 mercruiser 5.7 carb exchange

    Do Pontiac engines also have this feature? And humans who own them also disregard science and known variables about how carbureted engines work? Asking for a friend......
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    1984 228 305 carb problem

    Wow, you're still stuck on the auto stuff, it's great you've managed to acclaim some self pride though cars You can keep posting useless info about your success however it cannot change science and the fact a vacuum leak increases rpm. Lovely pre DeLorean cars BTW. But if you have never...
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    1984 228 305 carb problem

    If you're confirming your earlier post of saying a vacuum leak does not increase rpm then yes, you really do not know how a naturally aspirated engine works.
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    MERCRUISER 7.4 MPI NO SPARK

    New distributor? My guess is main or fuel pump relay. Possible fuel pump. You say you have no spark but have you verified this? Key on engine off does fuel pump run/prime?
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    End of Season Maintenance

    Just glad I have front disc, og 83 ford yo!
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    1984 228 305 carb problem

    What happened to 900 rpm idle speed? You do not understand how a naturally aspirated gasoline internal combustion engine works
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    1984 228 305 carb problem

    You can set the idle to whatever speed you like. Spec calls for 6-700 in gear. That means in the water, in gear. You need a load on the system for you to adjust properly. Boat is intended to work properly in the water. Can't see too many people sitting in their boat on the trailer loving life...
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    4.3L Mercruiser Milkshake

    Dunno why anyone would ditch a solid thunderbolt ignition for a pertronix but people do weird things Seeing as how tbolt ignition modules are becoming unicorns may be acceptable to take the offered ignition system
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    Mercruiser pre alpha trim pump.

    preach
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    End of Season Maintenance

    Awesome! You inspect/change the differential fluid on your truck. Keep it in the truck forum If you really want to talk rear axels let's talk checking brake shoes on a Dana axel
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    4.3L Mercruiser Milkshake

    Post # 14 FYI, if indeed a thunderbolt ignition the distributor will be okay. You need a v-8 cap and rotor and as I mentioned earlier a v-8 module
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    End of Season Maintenance

    Yeah, we're talking boats here. Mainly sterndrives which take more straight consistent torque and power than most ordinary trucks.
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    Mixing Mercruiser 120 ( 1971 ) with Alpha Gen II ( 2000 4.3L )

    Splined shaft length should not matter as long as you retain the inner transom plate which will mate with any mc1 gimbal housing
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    Mercruiser pre alpha trim pump.

    Ebay, mercury website or local repair shop MCM manuals are hard to come by these days, especially old ones. I have seen oem reprints of 1, 2 and 3 but it's a copy of reprinted pictures and literature. FYI, #1 covers all mcm/mie engines and drives for the appropriate serial range
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    End of Season Maintenance

    You don't store your boat properly And your syntax/vernacular is odd...........
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    Mixing Mercruiser 120 ( 1971 ) with Alpha Gen II ( 2000 4.3L )

    There are mc1 transom assys that use threaded pins for the bellhousing with most recent available senders. Look for late 70's early 80's mc1 assys
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