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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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  #1  
Old 08-27-2012
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Slipping prop troubles

Well, after we finally got the diesel in my son's Newport 30 running great, he was able to take it out for a nice 5 hour sail around Charleston. Had a great time and was heading back toward his boat slip on the Ashley river. He fired up the diesel and when he put it in forward, no thrust. He confirmed that the shaft was spinning where it was connected to the transmission.

Now this had actually happened to us when we had finally gotten the motor running again. We could start it up, and when we put it in forward the first time, it created thrust, tugging against the dock lines. We then put it in neutral, then back into reverse and no reverse thrust. Back into forward, and now no forward thrust.

We started the next morning, and again, forward thrust was there, no reverse thrust, and then no forward thrust.

So the day he took it out, he had forward thrust to get out of the slip and out to where he could hoist sails, tool around for 5 hours, and then trouble when it was time to dock, have no thrust again. Fortunately has unlimited towing to assist getting parked in the slip again.

Is something worn out or loose causing the sporadic behavior with the prop?
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Old 08-27-2012
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Re: Slipping prop troubles

I'd guess that the keyway under the prop has disintegrated.
Take a look at the very bottom of this link: Propeller Shaft

Atomic 4 in that Newport 30' or a repowered diesel?
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Old 08-28-2012
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Re: Slipping prop troubles

If the shaft is indeed spinning properly in each direction, then it's time to pull off that prop and have a "look see". Hopefully it's like Caleb shared and it will be an easy fix. Either way, someone's getting wet!
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Old 08-28-2012
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Thanks guys, that's what it seems to be doing. By the way, its a Vetus M3.10 diesel.
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Old 08-28-2012
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Re: Slipping prop troubles

Fix it quickly, friend.
It will make an awful mess of the prop and/or shaft taper.
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Re: Slipping prop troubles

If you are doing it yourself you can find a lot of keyway stock here: McMaster-Carr
Measure carefully.
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Old 08-29-2012
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Slipping prop troubles

Our diver is going down to take a look in a day or so, will let you know what he says.
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Old 10-01-2012
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Slipping prop troubles

Yep, it was the key. Very worn. Diver is replacing this week and we should be back in business! Thanks!

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Last edited by leogallant; 10-01-2012 at 10:01 AM. Reason: Added pic
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Old 10-01-2012
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Re: Slipping prop troubles

Egads Leo!
That key has nothing square about it left! It is barely even straight.
No wonder you were having problems.

It is good to fix these 20 year (hopefully) maintenance items like this. Good work.
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Haha, yes indeed! :-)
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