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  1. M

    mercruiser120 Timing

    I set engine Mercruiser 120 S/N 6918374 at TDC on comp stroke mark lines up to zero, put rotor facing forward turned it 1/8 CCW to point toward #1 and the timing is 2 inches to the left of 8 deg, rpm 900 lowest I can go on muffs without engine quitting , tried 3 times with same result...
  2. M

    Shift Interrupt system

    I have a alpha one drive mercruiser 120 0B934509 when I hook the wire up from the shift interrupt to the coil with shifter in neutral the engine dies, other than that with it disconnected it shifts ok in and out of gear. Is this a bad shift interrupt switch
  3. M

    Engine Serial Number Which Year

    I have a mercruiser 120 drive unit 0b934509 (engine number from plate in front of starter 8918374) can't find which year it is on any site search
  4. M

    mercruiser 120 exhaust manifold petcock

    Just replaced water pump in drive unit, brandnew to boats, I opened the petcock in the bottom of the exhaust manifold and a good stream of water was coming out while engine was running, then it stopped after awhile, is water supposed to come out this or did it get plugged up.
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