strange noise on 3YM20 ?

[petibonvm]

Hello, I have a problem with my Yanmar 3YM20 after relaunching. There is a loud noise at mid-range both forward and reverse. It sounds like cavitation but there are no bubbles behind the propeller. The shaft does not seem misaligned, I did not change anything during winter storage, the PSS seal seems OK. If you have any idea, thank you?

My files - UploadNow.io

 

[ridgy]

Can you post a link that doesn't require an account? You can upload directly if less than 1MB

 

[petibonvm]

here is another link drop.infini.fr I will make a better video on Wednesday.

 

[ridgy]

Have you lubricated the PSS by pulling the carbon disc back a little to let some water in? Can't imagine it would make that racket but worth a try.

 

[petibonvm]

Thanks for your help. The PSS gasket leaks a few drops at startup due to engine vibrations, then nothing. So I think the carbon discs aren't glued. How can I get them unstuck? Is it possible while the engine is still running?

 

[ridgy]

Doesn't sound like the PSS overheating if it leaks a little by itself.
You've poked your head around the engine bay to try to ascertain where the noise is coming from? From engine, gearbox, or sterngear?
Does it make the noise in neutral?
Checked oil levels of engine and gearbox?

 

[petibonvm]

no abnormal noise with the engine disengaged. no abnormal noise inside the engine, only in the cockpit.

 

[petibonvm]

drain and engine level and inverter ok. on the video (without sound) drop.infini.fr we don't see any cavitation bubble. I'm going to fail to see propeller, shaft and anode. what's weird is that there wasn't this noise before the water came out???

 

[Boater Sam]

What is on the prop?

 

[petibonvm]

fixed triple propeller

 

[LittleSister]

. . . no abnormal noise inside the engine, only in the cockpit.

Perhaps something in a locker or somewhere vibrating in sympathy at certain revs? (The engine vibration will be lower when the engine is in neutral and not under load.)

 

[Boater Sam]

fixed triple propeller

But what else is on the prop?

 

[petibonvm]

But what else is on the prop?

an anode on the propeller and an anode on the shaft. I'll change the shaft anode when I go beaching

 

[petibonvm]

Perhaps something in a locker or somewhere vibrating in sympathy at certain revs? (The engine vibration will be lower when the engine is in neutral and not under load.)

I'm looking at this

 

[petibonvm]

Thank you all for your contributions. The noise is coming from the waterlock. I think it appeared after I changed the seawater pump impeller, which is much more efficient than the old one.