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  1. S

    Mercruiser 4.3 MPI overheating

    Your right again ! The check valve had impeller pieces in it. It didn't have hose clamps so it had to be cut out. How do I get it back in ?
  2. S

    Mercruiser 4.3 MPI overheating

    The hoses aren't switched on the pump because the inlets are different sizes. The sea water pump is new. The only part of the line that wasn't backflushed for obstructions is the check valve after the steering cooler. I'll do that now. I just wanna say that all you guys that know your s#@t are...
  3. S

    Mercruiser 4.3 MPI overheating

    Also there is one line going into the power steering cooler and it comes directly from the sea water pump
  4. S

    Mercruiser 4.3 MPI overheating

    Ok, I put in the ball valve which was a great idea. I've checked the sea water line from the raw pump to the heat exchanger for obstructions. The ball valve is closed and I still have no water flow. I don't get it ?
  5. S

    Mercruiser 4.3 MPI overheating

    I've had it about a year and haven't taken it offshore once because I'm not comfortable with it. The first day I was getting a low water pressure alarm. So I rebuilt the sea water pump and it ran pretty good for a couple trips then the overheating started. Starting at the sea water pump I...
  6. S

    Mercruiser 4.3 MPI overheating

    Could the water hose hook up on the transom be sucking air if its not capped ?
  7. S

    Mercruiser 4.3 MPI overheating

    I was told there is no pump in the outdrive. There are two open hoses under the outdrive that would've come from the pump if I had one.
  8. S

    Mercruiser 4.3 MPI overheating

    Here's what I'm working with 1. the thru hull pick up 2. pick up under boat 3. alpha one outdrive 4. garden hose feed on the sea water intake line 5. garden hose hook up on transom
  9. S

    Mercruiser 4.3 MPI overheating

    It's an I/O with alpha one drive
  10. 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...
  11. S

    No spark Mercruiser 4.3 mpi

    Well Mr Fun Time's, you hit the nail right on the head !!! The connector going into the crank shaft sensor indeed did have a broken wire ! I want to thank all the contributers to this forum. You guys are very helpful, you save people a lot of money and most of all you know your **** !!! Being...
  12. S

    No spark Mercruiser 4.3 mpi

    The serial number is 1A054765. I've got the service manual or at least the one your talking about. Mercury service manual #32. It's got power to the coil and the fuel rail is pressurized and seems to be fine. the mobile mechanic had the Mercury computer program and the code it gave him was...
  13. 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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