Thursday, July 12, 2012

7.5hp 2-Stroke Ted Williams Outboard, Sheared Pin

A month and a half ago Rylan, Amanda, and I took the boat out to Brush Creek and ran into a few issues on along the way. We put the boat in at the boat ramp near the Ohio River and drove upstream for an hour and a half looking for good looking catfish spots. We have since found a public ramp further upstream. While trying to navigate an extremely shallow riffle, the outboard motor hit a couple rocks and the prop quit spinning, the motor still ran but the prop wouldn't spin. So we trolled 2 hours back to the ramp in the rain later that night.

When I got home I took the motor apart and started to analyze every part. I took the prop off and noticed that the propeller was driven by a single pin.
Propeller, nut, and cotter pin.
Prop and Pin
Pin
That's when it hit me, when I bailed hay for my first time I "sheared pins" on the power take off. For a lack of better words, I guess what we did when trying to travel up the shallow riffle was comparable to shearing a pin. The pin is made to break when the prop encounters a hard surface such as a boulder, tree, etc. So I made a trip to Bass Pro to find a pin that would replace the one in the outboard. All I could find was a pin made for a trolling motor, Bass Pro's "Prowler" series. I picked up a kit for $12 which contained two pins. The trolling motor pins were softer than the original pins for the motor, so they broke/sheared much easier. Several trips later I needed more, so I ordered another kit. Eventually I got tired of buying kits and I began to look around the garage for rods similar in diameter. An hour later I found a few nails that looked like they would do the job, or at least get us home if needed. I grabbed a hacksaw and cut them to length.
Prowler kits with factory pin.
Factory Pin at top, Nails at Bottom.
The nails are slightly softer than the pins, so they tend to bend rather than break. Therefore, the prop will take the brunt of any accidents. I figure I can get a new prop for the price of a few dozen pins. Needless to say, I don't want to travel 2 hours in the rain because of a sheared pin. Now I carry a few extra in the boat box.
Spare pins, in the boat box

1 comment:

  1. Watch the picture of this shear pin.You may like it.Because it is very nice to all.Here presented so clearly that we can learn every thinks clearly.

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