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  1. Eric 3.7LX Alpha 1

    Dies when throttling up from idle after warm up/ 89 merc 3.7 2bbl

    The resistance wire is solid purple. The other wire on the (+) terminal on the coil should be Purple/Yellow, which should only give 12 volts to the coil (+) when the engine is cranking over, and should be dead with the key in the run position. A new resistance wire is Mercury/Quicksilver...
  2. Eric 3.7LX Alpha 1

    Mercruiser 3.0 diagnosis / serial number decode

    Awesome! Glad you got it figured out.
  3. Eric 3.7LX Alpha 1

    Mercruiser 3.0 diagnosis / serial number decode

    I added a mechanical fuel pressure gauge inline between my pump and carb, to verify fuel pressure if I ever had an issue while running. I have since removed it though due to the weight of the fitting and vibration, it eventually would cause one of the flare ends to split and leak. I may re...
  4. Eric 3.7LX Alpha 1

    Mercruiser 3.0 diagnosis / serial number decode

    I believe not having the spring would allow fuel to bypass the filter, as if it were clogged. You could always remove the filter completely for testing purposes. If the fuel bowl is empty, and the float is down, and needle valve is lifted off the seat, you should be able to blow air with your...
  5. Eric 3.7LX Alpha 1

    Mercruiser 3.0 diagnosis / serial number decode

    Just to confirm the issue is at the carb, you could remove the gas line from the carb inlet again, and stick it into a 5 gal pail, have someone crank the engine over for about 15 or 20 seconds or so and confirm fuel squirts out of the line into the bucket. It won't be steady flow, it will pulse...
  6. Eric 3.7LX Alpha 1

    Mercruiser 3.0 diagnosis / serial number decode

  7. Eric 3.7LX Alpha 1

    Mercruiser 3.0 diagnosis / serial number decode

    Check the fuel filter on the carb inlet. It could be buggered up.
  8. Eric 3.7LX Alpha 1

    Mercruiser 3.0 diagnosis / serial number decode

    I think your referring to the shift interrupter switch near the valve cover. See this write up: HOW TO: How the Shift Interrupt system works https://forums.iboats.com/threads/how-to-how-the-shift-interrupt-system-works.283168/
  9. Eric 3.7LX Alpha 1

    Mercruiser 3.0 diagnosis / serial number decode

    Each spring time when I'm ready to fire it up, one of the first things I do is clean the point contact surface. That brass surface on your rotor button (the part that contacts each post on the cap) looks clean as a whip, you can check the brass contacts on the underside of the cap also for wear...
  10. Eric 3.7LX Alpha 1

    Mercruiser 3.0 diagnosis / serial number decode

  11. Eric 3.7LX Alpha 1

    Mercruiser 3.0 diagnosis / serial number decode

    Spark comes from the coil, and enters the center post of the distributor cap. The spark is controlled from the points and condenser in the distributor. The rotor rotates and sends spark to the correct plug.
  12. Eric 3.7LX Alpha 1

    Mercruiser 3.0 diagnosis / serial number decode

    Have you checked out this one from the "ADULTS ONLY sticky" How To: Troubleshoot a Points Ignition System https://forums.iboats.com/threads/how-to-troubleshoot-a-points-ignition-system.328601/
  13. Eric 3.7LX Alpha 1

    Lower unit wont separate from top.

    For some reason, I took his post as he was changing the whole drive. Now that I read it again, it looks like he just wanted to change the lower half of the drive.
  14. Eric 3.7LX Alpha 1

    Lower unit wont separate from top.

    With the drive serial number. You can find the serial number under the port side decal, see this attached link from the "Adults Only" sticky at the beginning of this forum. https://forums.iboats.com/threads/where-to-find-mercruier-stern-drive-and-engine-serial-numbers.608167/#post-4434269
  15. Eric 3.7LX Alpha 1

    Lower unit wont separate from top.

    You have to order the correct gear ratio drive. They come in different flavors depending on your engine. The 4.3 uses the 1.84 or (1.81 if SEI) gear ratio. You can sometimes get away with a different ratio with a prop change, but if your buying new, no need for that.
  16. Eric 3.7LX Alpha 1

    Running 3.7 190 with no outdrive

    Yes, you can run the engine like that, no problem
  17. Eric 3.7LX Alpha 1

    3.7 Mercruiser 190hp.

    The black wire from the distributor goes to the (-) terminal on the coil. There's also a black ground wire on the electric choke, and a black ground at the shift interrupter switch.
  18. Eric 3.7LX Alpha 1

    3.7 Mercruiser 190hp.

    TSB on timing change for the 470/3.7 attached
  19. Eric 3.7LX Alpha 1

    3.7 Mercruiser 190hp.

    Any spot on the distributor could be set up as #1. If your just now setting the distributor in the engine, you'll want to set the timing tab so the mark on the harmonic balancer is at 4º before top dead center on the tab, on the compression stroke for the #1 cylinder. Then drop the distributor...
  20. Eric 3.7LX Alpha 1

    3.7 Mercruiser Running Hot

    Welcome. Last summer you had a cracked head, or head gasket? The gasket is common to fail on these if they overheat, the head cracking isn't very common to happen. I don't believe the engine circulation pump is often the cause of an overheat on these either. Bad thermostat, impeller in the...
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