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  1. M

    1995 mercruiser5.7 electronic fuel injection problems i think

    Since spring launch the engine has been running fine yesterday after a few hours of cruising the engine began to bog down and I would have to back of the rpms to about 2 k to get back. The fuel gage when it was bogging down was bouncing between empty and half full. the bogging down was...
  2. M

    finding the correct prop

    I have a 19 foot cobia cuddy cruiser powered by a 3.7 l mercruiser stern drive with a alpha 1 outdrive. The WOT on the engine is rated between 4600 and 4800 RPM. I am currently using a 13 inch 4 blade 20 pitch prop. It is not the original prop. It will plane out at about 3000 rpm with only me on...
  3. M

    89 mercruiser 3.7 l engine acceleration problem

    Took the boat out for te first run of the summer ran great for 20 minutes and then died. Restarted and then I could not get above 1500 rpm. limped back to the dock. When I powered up with the outdrive disengaged I it would throttle up without hesitation and maintain high rpm 3000 to 4000...
  4. M

    89 mercruiser 3.7 l engine starting problem

    Getting the boat ready Batteries are fully charged at 12 volts. I converted to an alternator last year and everything ran well. Started it up today and it ran well. Cranked it serveral times to insure that the starter motor was operational. When I went to start it up again I would then get a...
  5. M

    89 mercruiser short circuit on the grey wire to the tach

    Hello folks The engine is a 1989 mercruiser 3.7 L paired to a alpha 1 outdrive I isolated the problem with no spark to the grey wire connected to the coil. Once I disconnected the wire the engine rolled over and ran all day without incident. I rebuilt the ignition replaced plugs, high tension...
  6. M

    89 mercruiser with alpha 1 outdrive.

    I cannot get it into forward or reverse. When I engage the shift the interupt works as intended. When I slowly put it in either forward or reverse I hear the drive gear trying to go in but It seems as though the shift cable is out of adjustment. How do I adjust the cable. :confused: Regards...
  7. M

    spark plugs for a 1989 mercruiser 3.7 l

    Hello to all Trying to find the Champion plug model for my 1989 mercruiser 3.7 l 165 hp 2 barrel carb Regards Middle Gary
  8. M

    Engine 1989 Mercruiser 3.7l Model MCM 3.7 Litre Engine SN OC 618761

    Hello to all Does anyone know what the voltage output from the alternator should be on the two yellow/red wires be? regards Gary
  9. M

    Engine 1989 Mercruiser 3.7l Model MCM 3.7 Litre Engine SN OC 618761 voltage regulator problem

    The batteries do not seem to take the recharge from the generator or alternator (not sure if it is a generator or alternator system coming off the crank shaft at the front of the motor. When the boat is running I can run for hours without a stall out however voltage at the dash voltmeter reads...
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