@help

[tdonoughue]

Another satisfied customer...

Good job finding the problem!

 

[octavio3311]

Whenever I back her in close to shore, I make it a point to push her off into deeper water (like chest height) before I fire up the engines.

Glad it was a simple fix.

 

[bronze_10]

On the water... port engine has a high pitch whine... never been there before... still runs at full throttle... and smooth.. but is a new sound... nothing in clean out port of in the nozzle that I can find... sounds like it is coming from the rear area... maybe the pump area... still had thrust and power.... scratching my head..

 

[Murf'n'surf]

Cone bearings?

 

[bronze_10]

No idea.. on the water it sounds like it is coming from the engine compartment around 6 to 8 thousand rpm.. at wot it is not as noticeable.

 

[Murf'n'surf]

Could be the intermediate bearing.

 

[bronze_10]

Where exactly is that located? I have never taken any of that apart.

 

[tdonoughue]

Intermediate is a box right behind the engine. It is where you lube, so it should have a zerk on it. Actually, I think the 2008 have a hose from it up to a zerk above the engine.

 

[Murf'n'surf]

After your run, feel each bearing housing and see if one is a lot hotter.

 

[bronze_10]

Intermediate is a box right behind the engine. It is where you lube, so it should have a zerk on it. Actually, I think the 2008 have a hose from it up to a zerk above the engine.

That is the exact area where the noise was coming from..

 

[Scottintexas]

this is a link to the FAQ about intermediate bearing, remember the grease is to keep water out, the bearing should be sealed,
https://jetboaters.net/faq/what-needs-greasing-in-the-drive-train-on-my-yamaha-jet-boat.9/

 

[bronze_10]

So.. how often do they start to fail?... that's the area the high pitched whine is coming from...

 

[Scottintexas]

It's not a common issue, I would disconnect the zerk hose and pump some new grease through it until it comes out the end and then reconnect the hose and give it a few more pumps to see how it sounds, just trying to do easy, inexpensive trouble shooting first,
have you pulled your impellers lately? maybe pull them and run the engine to see if the whine is still there,

 

[bronze_10]

I have never taken apart any of that.. i just got the boat last year

 

[Murf'n'surf]

Look for fishing line wound into the bearing where the shaft enters the hull in the intake tunnel.

 

[bronze_10]

Roger..