Strange noises from below... - SailNet Community
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post #1 of Old 04-29-2013 Thread Starter
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Strange noises from below...

No, I do not need a Rolaids but thanks for asking .

Just bought a 1990 C&C 34+. When motoring at lower rpms, say about 1000-2000, there is this kinda irregular thumping sound which I can feel in my feet and hear. It is not loud and not shaking the boat but still a concern. Just had the boat out for survey and the shaft etc. "looked all right." Boat has a dripless seal which all seems to be in order. Motor mounts seem OK, not a buuch of movement. The sound does seem to be moderated by rpms though. Also, it has started to make a chirping sound, also effected by rpms. At first I thought this could be the fan belt or water pump/alternator but those seem OK.

Could the shaft seal make such noises and vibration? Ideas?

Dave
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Re: Strange noises from below...

Cam shaft? My truck has that problem. Been like that for the last 30,000 miles.
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post #3 of Old 04-29-2013
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Re: Strange noises from below...

Do you have a folding prop? mine used to make noises like that have a fixed one now and no noises.

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post #4 of Old 04-29-2013
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Re: Strange noises from below...

My boat resonates when the engine is running at an idle, 800 to 900 RPM, then everything settles down at higher RPM.

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post #5 of Old 04-29-2013
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Re: Strange noises from below...

I experienced a chirping noise like you described, and found it was a loose zinc on the propshaft. You may also want to check your cutlass bearing. If you have a folding prop, it may have some slop in the blades, or it may not be opening properly causing an imbalance.

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Re: Strange noises from below...

Hey

The thumping sound is a classic symptom of worn cutless bearing.

Good luck
Barry

Barry Lenoble
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post #7 of Old 04-29-2013
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Re: Strange noises from below...

After our last haul out for anti fouling in November our girl developed an odd thump thump when in reverse. This with a Flex-o-Fold prop. She was again hauled late March for another reason and while she was out I gave the prop a really good going over to make certain it opened all the way out and had no obstructions. Since going back into the water the noise/vibration has stopped. I am told it could have been cavitation caused by the prop not fully opening (possible something caught up inside) and went away after I had cleaned away the obstruction.

Soooo .... if you have a folding prop maybe same problem. If fixed prop simply ignore everything I have just said.

Andrew B

“Life is a trick, and you get one chance to learn it.”
― Terry Pratchett, Nation

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post #8 of Old 04-29-2013
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Re: Strange noises from below...

Do you have frisky couples on board when you take the boat out?

I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.
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post #9 of Old 04-29-2013
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Re: Strange noises from below...

If you can feel it in your feet you most likely have an engine/shaft alignment issue and/or possibly a worn cutlass bearing. I don't no what the chirping is; hamsters?
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post #10 of Old 04-29-2013
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Re: Strange noises from below...

cutlass bearing...hopefully you haven't damaged the shaft yet, if so it may need to be replaced as well. Looks like a dive or haulout

Cheers,
Shawn & the crew of S/V Windgeist

1982 Tartan 37 CB - Hull #358


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