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Go Back   SailNet Community > On Board > Gear & Maintenance > problem diagnosis needed, no speed, smoke, low rpms
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Thread: problem diagnosis needed, no speed, smoke, low rpms Reply to Thread
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Topic Review (Newest First)
01-12-2013 12:13 AM
Yamsailor
Re: problem diagnosis needed, no speed, smoke, low rpms

All I can say is..I am glad I was wrong!
01-11-2013 10:32 PM
chef2sail
Re: problem diagnosis needed, no speed, smoke, low rpms

.....Yes because of the Barnacles...but I am jiggy with sharing with John. I would love to me him when I get out that way as he seems like a great guy. He has an awesome boat it looks like too.

Dave
01-11-2013 08:49 PM
Faster
Re: problem diagnosis needed, no speed, smoke, low rpms

Sorry, Dave... but it was John that nailed the 'stuck in the feathered position'... OK... one cheer for you too!!
01-11-2013 08:30 PM
chef2sail
Re: problem diagnosis needed, no speed, smoke, low rpms

Quote:
Originally Posted by Faster View Post
all together now.... HIP HIP.. 3 cheers for jrd22!!


Feeling a little overlooked by Ron here


Posted in thread #3


Quote:
Quote:
You problem is proababaly shaft related, whether its growth or cutlass.

I would venture to say if all was fine before it is growth. Its amazing how a few barnacles can retard the boat speed. Thats the simple solution. More complicated could be shaft misalignment, a bad cutless bearing, or the coupling especially since you said you felt vibration, but again growth can cause that also. Think simple first. Chef2sail
Its ok that jrd22 is a good fellow
__________________
01-11-2013 08:14 PM
SloopJonB
Re: problem diagnosis needed, no speed, smoke, low rpms

This place is freakin' amazing.
01-11-2013 06:34 PM
Faster
Re: problem diagnosis needed, no speed, smoke, low rpms

Quote:
Originally Posted by thegreenflash View Post
Problem solved....It was due to growth, much more barnacles on the prop than I first thought, also the blades were not moving freely at all. The barnacles on the "hub" were preventing the prop from feathering correctly. 10 minutes in a wetsuit and it was solved, tachs up fine now with plenty of power. Thanks for the replies.
Steve
all together now.... HIP HIP.. 3 cheers for jrd22!!
01-11-2013 06:14 PM
thegreenflash
Re: problem diagnosis needed, no speed, smoke, low rpms

Problem solved....It was due to growth, much more barnacles on the prop than I first thought, also the blades were not moving freely at all. The barnacles on the "hub" were preventing the prop from feathering correctly. 10 minutes in a wetsuit and it was solved, tachs up fine now with plenty of power. Thanks for the replies.
Steve
01-09-2013 04:24 PM
Yamsailor
Re: problem diagnosis needed, no speed, smoke, low rpms

Is your wet exhaust discharging normally? if not, then check the elbow on your exhaust manifold. I had the exact same problem and realized the wet exhaust was exiting the elbow because it had a hole in it. The water drained to the bilge instead of out the exhaust pipe.

Overtime the interaction of seawater and exhaust gases cause minerals and carbon to precipitate on the walls of the elbow. Eventually the elbow clogs (like a heart attack) causing the exhaust pressure to build up and blow a hole in the manifold. You won't get an overheat alarm because the raw water is doing its job cooling the engine. The reason you have low rpms may be due to a pressure imbalance between the engine and the manifold. Replacing the elbow will eliminate the problem if this is indeed the problem.


Good luck.
01-09-2013 04:18 PM
MarkofSeaLife
Re: problem diagnosis needed, no speed, smoke, low rpms

Quote:
Originally Posted by lancelot9898 View Post
I don't see how a barnicle could be strong enough to keep it from rotating, but you never know.
The boat has had 5 months on a mooring in St Augustine. I reckon those barnacles may be oysters. I was there a month and my prop needed doing.
01-09-2013 03:39 PM
lancelot9898
Re: problem diagnosis needed, no speed, smoke, low rpms

You know if it is in fact the prop being stuck in the feathering position, I'ld like to hear an explaination from max prop. ie...lack of proper grease, broken gear
I don't see how a barnicle could be strong enough to keep it from rotating, but you never know.
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