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    Mercruiser 5.7 ?

    That is close enough, depending on 2- or 4-barrel carb.
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    How to test tach for accuracy?

    get your money back from wire tack and buy an extra REAL tack and temporarily install it. I purchased a Welcraft whose tack was way off too. 500 RPS and mid-range.
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    Newbie needs some help please!

    examine tension pully
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    Low Compression in two cylinders and blowby

    if you have put plug wires back in correct order, expect to pull head.
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    Boat won’t start, have spark and fuel

    charge battery!!!!!!!!!!!!!!!!!!!!!!!!
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    Newbie needs some help please!

    are the rest of pulleys free turning? Make sure! Was belt complete of torn into or just slipped off? You may have a weak idler pully tensioner? Looks like circled one is water intake pump. It should have some resistance.
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    MerCruiser 4.3L V6 milkshake oil from cracked intake manifold, how to remove milkshake oil?

    that's low compression. I believe all should be >150. You have to find water leak. That will determine if block is salvageable or requiring a total rebuild.
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    Water leak to the bilge from transom please help

    u need a flexible mirror on a long shaft, buddy and light. Pray you don' have transom rot. I had a y pipe's seal fail one time. I had to pull motor. But at least I didn't have to rebuild transom.
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    Oil Pressure Switch for Fuel Pump - Strange Happenings

    I learned years ago that most boaters buy pretty and don't think about issues "down the road. "
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    Oil Pressure Switch for Fuel Pump - Strange Happenings

    My best guess is that someone jerry-rigged it in order to get it to work and come home but then didn't fix it to CG specs. Go to adult section for how to install the proper oil switch and wiring. There are safety concerns!!!!! I hope electric pump is not an automotive type. I owned 2 alphas...
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    noise coming from gimbal/coupler area after taking on water

    That's a lot of H2O. Did you check alignment after pulling drive? I am not familiar with B3, but it is best to check shaft alignment anytime drive is pulled. Did you check drive lube for contamination? Regreased u joints????
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    Kinda Clueless in South Jersey

    You have a car/truck engine in the boat?. Take it to an independent and reliable car mechanic. Did engine heat up? Run out of oil? Is there water on the oil dip stick? Is motor anti-freeze cooled or 100% sea-lake water cooled? If water (milk or milk-brown) on dip stick, you may have a cooling...
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    Trim stopped working

    check for corroded battery connections/contacts and then for bad solenoid. Noids are easy to test by jumping them. I had a Proline who "ate" noids. You may also have crack in one of the copper wire's insulations. use miltimeter to check voltage coming and going.
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    Outdrive corrosion?

    is boat moored next to other boats? Are they having similar problems? Some other boat may be causing this crap due to producing stray currents.
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    No reverse no matter how i adjust the shift cables

    the shoe has a full 45 or 90 degrees of movement (I cannot remember exactly) That isn't much.
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    No reverse no matter how i adjust the shift cables

    New to you boat? If you have owned it for a while, what have you done to cause adjustment problems? I assume and Alpha? You must have friend move throttle linkage at helm while you observe drive "shoe." Laying on you back and looking at the back side of drive. If you have an Alpha, I believe...
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    Oil everywhere

    I bet you left old O ring on block. Or, blew Oil Pressure switch.
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    Mercruiser 5.0 50 degrees at idle

    you should pull valve covers (to examine) and rotate motor base when #1 piston is on top of compression stroke. Watch rocker arms and distributor rotor. Then, examine rotor to see if it remotely pointed to #1 CONTACT. Pray that you haven't jumped time.
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    Outdrive Popping

    I never heard of pulling motor w/o drive pulled FIRST.
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    Mercruiser 5.7 won’t make power

    not familiar with your ignition system but it may have a knock sensor that needs to be disconnected before setting base timing. also, did you check for debris clogging gas pick up tube filters? my tanks had them and were clogged.
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