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    Problem with a Mercruiser 5.7 V8 LX

    Can say with absolute certainty the number one likely cause if no/weak/inconsistent spark on a thunderbolt is the ignition sensor in the distributor. Not saying that is your issue or to just arbitrarily replace it however there is a step in the troubleshooting guide for testing the sensor You...
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    Problem with a Mercruiser 5.7 V8 LX

    Third step from the top suggests checking voltage, in your case it's not 0 volts but low voltage. Treat it the same as 0 volts and inspect wiring harness, instruments and wiring, battery and connections, etc... My WAG is your issue is a weak battery/poor connections coupled with a possible...
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    Problem with a Mercruiser 5.7 V8 LX

    There's a troubleshooting guide posted in the linked thunderbolt write up
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    Did research re slow trim tilt but…

    Yeah, based on the pictures that's the first thing to do.....
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    Alpha 1 Gen 2 - Twin Merc 5.0 MPI - trim and trailer up and down both not working

    There are fuses on the trim pump assy, one in line for the primary side and one fusible link for the main power. If the connections were hooked up backwards I'd suspect the fusible link to have failed. If the batteries were replaced recently, (possible due to selling) there's a cance the...
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    Engine turned off while running then wont start

    How did you verify spark?
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    Alpha 1 Gen 2 - Twin Merc 5.0 MPI - trim and trailer up and down both not working

    Sounds like a poor/missing connection +/-. Have you checked for power and ground at the pump assys?
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    1997 carver 5.7 port engine removal

    Guessing based on your question and thoughts of removing salon aft door and using an extended fork to hoist the engine this is an MIE? Located below the aft salon floor? Carver isn't always the "nicest" boat builder when it comes to repair however I'd like to think they'd give a pragmatic...
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    Mercruiser 120 Non-Start Condition - Wiring?

    https://forums.iboats.com/threads/how-to-troubleshoot-a-points-ignition-system.328601/
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    How's this Merc 2007 5.0L MPI sound?

    Exhaust manifold gasket Whirring may be alternator?
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    new vs. old thunderbolt ignition sensor

    Only if the fuel pump is electric.
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    new vs. old thunderbolt ignition sensor

    One wht/grn goes to ignition module, other wht/grn is for shift interrupt switch. If the wires from the module/shift interrupt have ring terminals use the adapter kit from the new module to connect to the bullet connectors. Double up the wht/grn wires to make the connection. Black goes to...
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    oil leak on 3.0

    Yes but it's not easy You'll need at least one bent 7/16 wrench to get the upper clamp bolt loose. It's tucked up fwd of the gimbal ring. Tough to get at even with the bellhousing out of the way. Going together you only need the lower clamp bolt
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    Mercruiser Oil Pressure Alarm switch troubleshooting

    On a carbureted engine most obvious place would be aft of intake manifold, near the distributor
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    Removing Bell Housing

    You need to remove the nut on top of the steering shaft/tiller arm inside. Easiest way to access is to remove the transom assembly and do it on a workbench. Other way is to cut access holes on either side of the gimbal housing, use a punch and hammer to remove the nut and install the new one and...
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    Mercruiser Oil Pressure Alarm switch troubleshooting

    Is the engine efi or 2bbl carb? It can't be both.....
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    Removing Bell Housing

    No. Old style hinge pins were unthreaded and held in place with nails, later styles were threaded. The pivot area is metal to metal with grease being the cusion between. The only replaceable pivot points on the transom assembly are the upper and lower needle bearings for the steering in the...
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    alpha 1 Gen 2 sterndrive broken lower drive shaft

    You've seen this how many times? With a 24 ft Bayliner cierra?
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    Main engine for trolling

    OP wants to know if they can operate their engine/ boat. I'm not in charge of their life. If they want to run the engine they can. My best advice based on info provided is to not operate their engine, this will ensure it remains sound. Is that okay?
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    Main engine for trolling

    What you want to know?
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