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Old 17-04-2011, 19:07   #1
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Prop Shaft Pin

I'm in the middle of a repower and am using a shaft coupling that has a 1/4 roll pin to secure the 7/8" shaft (and a set screw). The motor is a 1 Cyl 9 Hp Volvo diesel and the prop is a 3 blade 12x12, shaft is about 40" long. Is this conventional, should it be a solid pin? Larger dia? Or have a keyway machined in?

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Old 18-04-2011, 18:42   #2
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Re: Prop Shaft Pin

It depends if the set up is originally from the manufacturer. A 9 hp Volvo is not going to put a lot of torque on the shaft. Make sure your carry a couple of spare pins and a pin punch. It may act as a shear pin in the event you wrap a line around the shaft.
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Old 18-04-2011, 19:04   #3
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Re: Prop Shaft Pin

I worked on a couple Albin Vegas....they all had roll pins.

Buy a punch for the roll pin......don't try to go the cheap route with screw drivers.....you'll thank me.
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Old 18-04-2011, 19:40   #4
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Re: Prop Shaft Pin

Thanks guys for the answer.
This is not original at all but it will work for me. Just put in the engine today, had to completely cut out the old beds and fab up some new ones. The engine just fit even with a very low bed (1/4 flat bar glassed on the hull) I could only go down about 1/4 inch more.


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Old 18-04-2011, 20:42   #5
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Re: Prop Shaft Pin

As long as it has a set screw you should be OK. It shouldn't spin, galling the coupler/shaft if the pin does shear. Paint a thin matching line on the shaft and couple and do periodic inspections.

When shifting from forward to reverse or visa versa just hesitate in neutral for a moment. Same thing on O/B's with shear pins in the prop.
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