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shear pin breaking-25 hp

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  • shear pin breaking-25 hp

    I have a 1977 25 hp evinrude and the shear pin breaks frequently when I go from an idle into gear. Someone suggested to me that my idle should be adjusted. Any ideas?

  • #2
    Re: shear pin breaking-25 hp

    Just how fast is it idling cowfish? Welcome aboard!You should be idling down around 650 to 750 rpms. Does it "clunk" when you shift into gear? If so, the idle is high and can cause undue stress on the shear pin causing it to break often.Can you get a timing light with tach capabilities to take a look or maybe a tiny tach?
    When in doubt...use the manual

    Rayland, Ohio....Along the Muddy Banks of the Mighty Ohio River.

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    • #3
      Re: shear pin breaking-25 hp

      The shear pin is just taking as much of the shock as it can, which it is designed to do to keep the gears from being ripped apart. When you shift that motor you have to reduce the speed completely back to shift (idle), then from neutral, shift firmly into gear.

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      • #4
        Re: shear pin breaking-25 hp

        Also be sure you are using the right pins.OMC used different metals for different motors.DHP

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        • #5
          Re: shear pin breaking-25 hp

          and if the engine is idling correctly check the pin hole in the propshaft for wear and the drive slot in the prop hub for excessive wear, both can shear pins when placed in gear if to sloppy.
          no tech questions by PM, they wont get answered.
          you have to be trusted by the people that you lie to .

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          • #6
            Re: shear pin breaking-25 hp

            I had that problem untill I discovered that I was overtightening propnut. That nut should only be just tight, and turned to cutterpin holes are aligned, and locked with a cutterpin. If you overtighten you will notice the broken pins looks a bit bent ( though in pieces ) when you take them out. Take it easy.

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            • #7
              Sign up today
              Re: shear pin breaking-25 hp

              thanks guys, you have been very helpful. This is a great discussion board that you have going here

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