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As best as I can recall, the propeller used on the 1967 model, 50 hp Mercury, was of a splined design. If there are splines on the engine propshaft, then no shear pin is used.

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Q: Are there shear pins in the drive of a 1967 mercury 500 outboard motor?
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How do you replace a shear pin on a 25hp Mercury outboard?

Is there a shear on a 1975 mercury 200 (20hp) outboard motor


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Replace the shear pin.


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It sounds like the shear pin has been sheared.


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The cone pin, or shear pin, is used to attach the propeller to the drive shaft so that if you hit something hard with the propeller, you only break the shear pin, and not the expensive drive shaft, motor, or propeller.Or, more specifically, that you only break the shear pin and propeller, not the drive shaft or motor.


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A homophone for "shear" is "sheer".


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The difference between a positive shear and a negative shear is the direction the image is distorted into