Prop shaft shims - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


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Old 06-29-2012
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Prop shaft shims

I am placing a small Farymann diesel into a Morgan 28 that formerly had an Atomic four. The farymann came with a coupling with a 1" shaft keyed bore. My prop shaft is 7/8. The prop itself is on a taper at the shaft end with a 1/16" plastic shim. Would it be acceptable practice to use a 1/16 shim on the shaft on the coupling end of the prop shaft to make up the difference?

Thanks for the assistance
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Old 06-29-2012
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Re: Prop shaft shims

No this wont be acceptable. I suggest taking the shaft and the coupling to a machine shop and getting them to make and fit a proper adaptor. Using a nylon or plastic shim on the shaft coupling will accentuate any vibration until it all flies apart.
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Old 06-29-2012
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Re: Prop shaft shims

Thanks, I was a bit surprised on the prop end, but guess I was hoping for an easy solution that didn't really seem like it would work on the end requiring some alignment, but your feedback is rational and accepted .
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Old 06-29-2012
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Re: Prop shaft shims

You might be amazed at what a good prop shop can do. They should be able to re-size the bore of your 7/8" shaft of the prop to accept a 1" shaft. Not sure but it might cost around $150+.
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