Recent content by mcgurk34

  1. M

    engine dies 10-15 seconds after starting

    my 1988 50HP 3cyc Mariner dies after shortly after starting. It ran great last week but this problem just appeared yesterday. Primer bulb does not get firm at all, but I do have to pump it to get the engine to fire. Tank vent is open. Checked it twice. Could the primer bulb go bad just sitting...
  2. M

    I need some help. Overheat alarm only @ WOT.

    The engine is a 1988, 50 HP, 3 cyl. I thought that I solved this problem, but it's back. I get a steady alarm but only at WOT. If I back off the throttle just a little the alarm stops. I've replace the water pump, temp sensor, water jackets are clean. Very strong telltale stream and there is no...
  3. M

    Which is it, a long or short shaft Mercury?

    I am helping a friend replace his blown lower unit on a 1993 115HP Mercury in-line 4 cyl. My friend asked if he should switch to a long shaft or stick with what he has now. Frankly, I don't know if he has a long or short shaft now. First question, How do you measure the shaft length? I need to...
  4. M

    how to adjust timing on a 50HP, 3 Cyl, 1988

    my engine manual procedure requires setting the timing with the engine running at 5500 RPM in forward gear. How can you do that safely? I don't have access to a test tank and the motor is mounted on the boat. Has anyone done this with some kind of barrel or garbage can? The idea of trying this...
  5. M

    rough running 1988 50HP Mariner

    The engine is not running smoothly at any RPM from Idle to WOT. Good compression (125 PSI) in all three cyl. I've recently replaced the three ignition coils and the electronic control module to repair a no spark condition in number one cyl. Starts and runs OK but somewhat rough, like its missing...
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