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    Bought a new long block and wondering about the coupling and gimbal bearing.

    something warped valves. 500 hrs is not really a lot if properly maintained. Good luck!
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    Bought a new long block and wondering about the coupling and gimbal bearing.

    I assume you have knock sensor, but does it work? If valves went bad due to pre-ignition, KS may be defective. Don't repeat same problem. That old of boat, I'd check for transom rot too. Trust me!
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    PLEASE HELP NEW BOAT OWNER CRACK

    Tear it apart but pray first. If no internal damage, any good TIG welder should be able to fix.
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    Mercruiser Bravo 2 alignment tool 1/32 wobble at end of alignment shaft? Too much?

    If were me, I'd contact MC for specs. This will give YOU peace of mind or make you replace coupler. BUT, Is gimbal bearing in good shape???? That may be where play is coming from????
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    Marine Flywheel compared to an auto flywheel

    unless motor is out, there is not much room to do this. May be enough room on single engine application. At least, I haven't figured out how to do it.
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    Water coming into bilge

    Just out of curiosity, did you replace shifter boot and clamp? This communication has been too long for my old brain to sift through. You said you replaced bellows but did that include shifter boot?
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    Mercruiser 7.4 Starter Grinding/Partial Engagement?

    I fear that sometime in the past, the teeth were being gowned using corroded helm switch. Mine switch was corroded. We tested with multimeter and saw major voltage loss threw switch. Just a suggestion before you POSSIBABLY ruin a new ring gear. U may have additional problems that seem to "grow"...
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    Water coming into bilge

    I agree, but when all else fails, punt, "danger close" or 5200. Then, use a bigger hammer. LOL
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    Water coming into bilge

    If motor is out, I'd examine for corrosion on transom metal. Older Alphas are easier to find than Bravos. You may consider finding a freshwater used one to replace yours if too much corrosion or you have a hairline crack. I'd try to resurface transom pipe connection and y-pipe surface. I know...
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    Is my coupler off ? looks like it and drive won't go back in ..

    If you have done as others have suggested and your front mount is solid.... You have larger mounts in the rear, considering the complete transom assembly. I fear that you have a sagging assembly. A simple test is to hit inside transom with large rubber hammer or drill 1/4" holes all around it...
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    Water coming into bilge

    both surfaces don't look smooth. They need to be a smooth as possible. Did you forget or dislodge the smaller o rings.
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    Water coming into bilge

    water over damn now, but after my transom rebuild, including new y pipes connected, I filled my bilge to almost go into gimbal bearing with tape water and checked for leaks. U sure that your y pipe gasket (o ring) didn't slip??????
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    Is my coupler off ? looks like it and drive won't go back in ..

    sometimes excess grease causes a suction upon tool removal.
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    Surging / losing rpm

    You may have an electrical wire leaking current. Start with muffs on and at night. Be sure to have good fire extinguisher near by. Using rubber gloves, exercise electrical wires and look for leakage. However, I suspect fuel blockage issues. My tanks had inline fuel filters inside the tanks'...
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    Marine Flywheel compared to an auto flywheel

    I had a bad console/helm switch that cause starter to drag and it ate the ring gear. NOT FUN. Something cause ring gear to wear out prematurely.
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    Is my coupler off ? looks like it and drive won't go back in ..

    take rubber hammer and pound transom inside and listen. I hope no rot. do same for stringers.
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    Mercruiser 4.3 Vortec running hot on one side

    and if it is an old saltwater used boat, the block's passage may be corroded and plugged up. If motor was saltwater cooled for 8 years or more, I'd pitch and invest in a new block while gas prices are out of this world. Few of us can afford boating anymore.
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    Smoke from the Alternator!

    snatch it off and take it to any shop that cane test it. CYA
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    Is my coupler off ? looks like it and drive won't go back in ..

    clean doesn't mean no rot. Trust me!
  20. T

    Is my coupler off ? looks like it and drive won't go back in ..

    Try hitting alignment bar a few times to see if you can center the inner gimbal bearing. Many times they get out of center as you remove heavy OD. Pray you don't have rotten stringer that sagged after you removed shaft.
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