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noise throttle down, shaft? |
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rogier 
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Joined: September-01-2008 Location: Netherlands Status: Offline Points: 77 |
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 Topic: noise throttle down, shaft?Posted: August-08-2009 at 7:41am |
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Hi,
when powering down and returning to idle there is a short squeeking noise just before the boat is sitting still in the water. Could this be the prop shaft experiencing friction? How to solve it? |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: August-08-2009 at 9:48am |
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Take a look at your prop shaft stuffing box. I've heard them squeak at low RPM's. Tighten it slightly (1/8 turn) and see what happens. Then, make sure the stuffing box isn't running hot.
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Luchog
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Joined: April-17-2007 Location: Argentina Status: Offline Points: 2135 |
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Posted: August-08-2009 at 1:33pm |
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Somedays my stuffing box likes to whistle after at iddle speed after a ride.
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rogier
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Posted: August-14-2009 at 10:36am |
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Thanks for the replies, I will try it.
I've got a tip somewhere to replace the wax cord. Is that realistic and then how to do it? |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: August-14-2009 at 11:21am |
Yes it is realistic but may not be needed. Is the packing gland dripping? It should drip as the packing is water lubricated. About 4-5 drips per minute would be normal for regular wax/graphite packing. Did to have a chance to check if the gland is running warm/hot yet? If not, then tighten. If hot, loosen. If you end up repacking, the new Gortex (from Skidim) drips less. |
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rogier
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Posted: August-16-2009 at 11:37am |
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No, not dripping at idle at the moment. Have never checked it under power. I guess repacking might not be needed then.
Will check hot/cold! |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: August-16-2009 at 12:10pm |
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Rogier,
Since the packing gland isn't dripping, then I suspect it's too tight, will be running warm to hot and is what's causing the noise. Repacking may not be needed but, if it has run hot for some time then there is a chance that the packing has scoured the shaft. It wouldn't be a bad idea to open up the stuffing box and take a look. |
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eric lavine
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Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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Posted: August-16-2009 at 2:15pm |
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at times when to tight it will turn the shaft purple in that area and cause it to work harden and become very brittle and will snap in that area. like Pete says take a peek
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"the things you own will start to own you"
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rogier
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Posted: August-21-2009 at 8:53am |
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Just a check: If I look at that with the boat in the water it will sink, right?
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rogier
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Posted: July-10-2010 at 9:01am |
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Opened the box in the winter, replaced seals and reconnected. The propshaft now is watertight with loss less of friction on the shaft. I can turn it by hand now, that was not possible in the past.
However it's still making a squeaking sound. Will try to tighten it with slow steps the upcoming weeks and hope it stops. Nothing running hot yet.. |
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p/allen
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Joined: March-14-2006 Location: Dixon Illinois Status: Offline Points: 942 |
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Posted: July-10-2010 at 10:50pm |
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Is it dripping water ? This is important . Needs to drip about 5 times per minute.
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rogier
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Posted: July-11-2010 at 8:49pm |
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No it's not, fully dry. From your comment I draw the conclusion that it might be needed to open it up?
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rogier wrote: