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Old 09-09-2010, 14:48   #1
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Join Date: Aug 2009
Location: South coast of England, moving around a bit.
Boat: Long range motor cruiser
Posts: 750
Prop Shaft Fault

I have a dripless seal on my prop shaft. Above the seal in use is a spare, mounted on the shaft and held up by friction. Doing the weekly check of all the through hull fittings I noticed that the spare gaiter had slipped down and exposed a section of shaft I don't think I've ever seen. By pure chance I noticed what appeared to be a spiral hair line crack, about 4 inches long, not extending to the outside of the shaft. I had an engineer look at it and then arranged for the shaft to be pulled and x-rayed. It's definitely a crack and I'm waiting now for a new shaft. When we put the boat on the hard, the prop was in excellent condition with no evidence of ever hitting something. Equally, the bearings etc were OK and the alignment was fine.

Can anyone suggest how this could have happened?

The message is the journey, we are sure the answer lies in the destination. But in reality, there is no station, no place to arrive at once and for all. The joy of life is the trip, and the station is a dream that constantly out distances usĒ. Robert Hastings, The Station
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Old 09-09-2010, 18:20   #2
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Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
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I have seen shafts get damaged by ahead/astern operation without allowing the shaft to stop turning.

I have seen 2 inch shafts twisted off.

Have you tried to have it magnafluxed in situ?
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