Higher Pitched Engine Noise "whine" Starboard Engine

[Thomas Smith]

I have a newly developed high pitched sound from the starboard engine. I am not sure if I am dealing with an impeller issue or possibly a bearing. I am not familiar what a bad bearing would sound like or what the symptoms are. I have not noticed any vibration and have experienced zero cavitation. I have confirmed no debris either. I have attached a link to youtube video which clearly demonstrates the noise differences between engines especially towards the end of the video. I also have a couple photos from the stern looking in and find a small bent leading edge on the starboard impeller. Could this possibly be the culprit? Thank yo for the help !

 

[Scottintexas]

@Thomas Smith glad to have you on board, I can't believe you haven't received 20 possible solutions for your question yet, it must have been a busy day and your post dropped off the "new posts" page and was over looked,

I certainly think I hear something also,

How long have you owned the boat?
Have you ever greased the main bearing?
Have you ever pulled the impeller and shaft out?
Have you ever looked at your cone bearings?

If you've not done either of the last two I think I might start there and run it without the impeller and see if you can duplicate the sound to lead you to an engine issue or a shaft/impeller issue.

Check out the FAQ for great instructions about all of this.

Update your profile with your location, there might be a member nearby that could help or at least give you something to compare it to,

 

[buckbuck]

Sounds like a bearing to me. Follow @Scottintexas advice to check those items. I suspect it is the cone bearing due to water getting in.

 

[Bruce]

I like @Scottintexas's suggestion of pulling the pump to see if the noise goes away. Hopefully it is in the relatively easy to replace pump bearings.

I changed mine recently and documented the process at https://jetboaters.net/threads/changing-yamaha-jet-boat-pump-duct-housing-bearings-and-switching-to-oil-bath-lubrication.10155/

I also suggest that you pull the cone off of the pump when you pull the pump to see how the bearings and grease look in there.

 

[Thomas Smith]

Thank you for the responses, here is an update, the noise is not there when I am out of the water and have it hooked up to a hose. This seems that the noise only exists when there is a "load" on the impellers by moving volumes of water through......IMHO.....other than that I have owned the boat since new in 2006, about 8 years ago I had a rock damage my impeller (on this same side ) and replaced it, so yes had the impeller and shaft out. I have greased the main bearing behind the engine compartment last season and just a couple of pumps. Since this noise started I have not pulled out the assembly and looked at the cone bearing........so with the update do you think its still a bearing and if it is only when under load would that be the cone bearing more than likely?

Thank you for the help, I am new to this site and yes, will update profile for sure.


Regards

 

[Thomas Smith]

By the way, I just went back out hooked up water to it, fired off the engine, again sounds relatively the same as the port side......then when I went and compared the noise down at the nozzle/pump level I do now hear a mild grind and now its time to pull it apart, sound like a bearing more than likely.............does anyone know where I could purchase the replacement bearing kits for the pump? I get lost when I start to do some research on it......someone has to sell a kit I would imagine.......

Thank you again !!

 

[Thomas Smith]

Ok, another update. I pulled out the impeller and shaft.......noise went away completely, here are pics of the bearing form the nose cone.....looks intact but grease is dark and had some water in there. Also, when you spin the impeller it is definitely rough and not smooth......I have it soaking now in hopes to ease removal tomorrow and take a look at the forward bearing. I think I need to replace them and again as I already posted any help would be great on where to purchase a kit......
Thank you !!