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  1. S

    Mercruiser 4.3 MPI overheating

    I've got the 4.3 (sn# 1A054765) and I can't figure out why its overheating. I've had several "marine mechanics" look at it. On they're advice I've replaced the sea water pump, circulation pump and put in a thermostat kit. I also opened up the heat exchanger (I did find some of sea water pump...
  2. S

    No spark Mercruiser 4.3 mpi

    Motor ran great until I had a loose hose on the raw water pump. To get to it the exhaust manifold and fuel filter had to come off. Got it back togetherand no spark. Replaced the coil, cap and rotor. No luck ! Had a marine mechanic come out with the computer and I had a bad relay. Put a new on...
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