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  1. J

    4.3 mercruiser alpha 1

    I have seen those, I may try one. Based on what I’ve posted, do you think this is a “vain attempt” to unseize this motor.
  2. J

    4.3 mercruiser alpha 1

    Further diagnosing today. Pulled the starter off, it spins, tried moving the flywheel with a screwdriver, no dice. Pulled the carb off… lots of rust picture attached Pulled one of the risers off, no rust pictures attached Pulled a valve over off, cylinder heads don’t look bad. Still have oil...
  3. J

    4.3 mercruiser alpha 1

    If the motor is seized shouldn’t the flywheel be locked up?
  4. J

    4.3 mercruiser alpha 1

    I put a new starter on but didn’t include the spacer that came with it. Is there any chance the new starter isn’t lining up? What if I pull the new starter and try spinning the flywheel by hand?
  5. J

    4.3 mercruiser alpha 1

    What do you think is most likely wrong, cracked block?
  6. J

    4.3 mercruiser alpha 1

    Motor still won’t crank, I can turn it with a socket and breaker bar…. But the pulley wheel doesn’t move
  7. J

    4.3 mercruiser alpha 1

    Ok here’s where I’m at. I pumped all the old oil out of the motor. There was no water in the oil. I squirted as much marvel mystery oil into the cylinders as I could. Then I put the rest of the oil in through the dipstick. I pulled the drive off. I’m attaching pictures. When I pulled the drive...
  8. J

    4.3 mercruiser alpha 1

    Ok guys…: I’m pretty sure I opened one of the drain plugs for draining water out of the motor…. Which would make sense why there’s antifreeze in there…. Right? So what’s my next steps for unfreezing this motor?
  9. J

    4.3 mercruiser alpha 1

    I have a really dumb question… the plug I drained was a brass plug down by the oil filter on the lower right side of the motor… that IS the oil plug right? I can send a picture tomorrow.
  10. J

    4.3 mercruiser alpha 1

    94 bayliner capri 2050 Where would you recommend I start looking for a suitable block
  11. J

    4.3 mercruiser alpha 1

    What long block would fit this engine? Would it have to be another 4.3?
  12. J

    4.3 mercruiser alpha 1

    Could you point to the thermostat housing?
  13. J

    4.3 mercruiser alpha 1

    Am I wasting my time? Should i put the marvel mystery oil in the main oil funnel, or try to spray it directly into the cylinders?
  14. J

    4.3 mercruiser alpha 1

    I pulled the oil drain plug and antifreeze came pouring out… it was winterized about 5 years ago by a marina
  15. J

    4.3 mercruiser alpha 1

    Have a boat that has sat for about 4 years. Before this it was a great running boat. Had water in the bilge for a time. I have replaced the battery and starter. Boat will not crank when I turn the key, but it cranks when I cross the solenoid. When I cross the solenoid, it clunks. I thought maybe...
  16. J

    4.3 mercruiser grinding noise

    Have a 91 Bayliner with a 4.3 mercruiser. Boat ran great last summer. Forgot to take plug out and it rained. Engine compartment flooded including submerged starter. Replaced starter with a new one from db electrical. Tried starting back up and the engine made a horrible grinding sound. Tried...
  17. J

    4.3 Mercruiser stern drive won't crank or even click

    Have a 95 Bayliner. Great little boat. Spent all summer on it. Haven't had it in the water for about 2 months (michigan) went to start it to winterize, nothing. I put a trickle charger on the battery for 3 days, still nothing. The trim works but no other electronics are working. About a month...
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