Engine sound

[Gucci]

When I run the starboard engine (330 Sundancer, 1995) on idle, the engine sounds normal but when I push the throttle a bit, it sounds like something is sqeaking, but then it immediately disappears when I push the throttle further to run it on higher speed. Any ideas what this might be?

 

[KevinC]

Two things that immediately come to mind would be (1) slipping belt or (2) a bearing starting to go on something like a pump or alternator. Determining exactly where the sounds comes from would be key to isolating it.

-Kevin

 

[superwa]

Checked the belts?

 

[Gucci]

Will do all three, thanks.

 

[Gucci]

Two things that immediately come to mind would be (1) slipping belt or (2) a bearing starting to go on something like a pump or alternator. Determining exactly where the sounds comes from would be key to isolating it.

-Kevin

Thanks!

 

[bobeast]

I had a horrendous squeak on one engine. In my case it turned out to be a bad impeller which prevented the sea water pump from turning. In addition to considering bearings, also consider an impeller issue.

 

[Gucci]

I bought new impeller parts last week, but the sound wasn’t there then, we’ll see if it disappears after the installation. Thanks.

 

[hottoddie]

Do those engines have the fuel pump mounted on the seawater pump? They are a PITA.

 

[scoflaw]

Take the belt off and give all the pulleys a spin by hand

 

[CliffA]

you can take the belts off and start the engine for a few seconds....if the squealing stops you know you have a problem with the tension of the belt or a bearing in one of the pulleys that is being driven by the belt...sometimes you can find a bad bearing by simply spinning the pulleys by hand with the belt removed but I like to use a mechanics stethoscope to listen to the bearings while they are under load from the belt and being spun by the engine....a bad bearing will produce a grinding noise through the stethoscope while running....obviously any bearing that does not turn reasonably freely is on the verge of freezing up which could also cause the belt to melt or the surface of the belt to glaze over if/when it does completely freeze....

cliff

https://www.amazon.com/s/?ie=UTF8&k...vtargid=kwd-6860464181&ref=pd_sl_48ukdy80v6_e

 

[Boater420]

you can take the belts off and start the engine for a few seconds....if the squealing stops you know you have a problem with the tension of the belt or a bearing in one of the pulleys that is being driven by the belt...sometimes you can find a bad bearing by simply spinning the pulleys by hand with the belt removed but I like to use a mechanics stethoscope to listen to the bearings while they are under load from the belt and being spun by the engine....a bad bearing will produce a grinding noise through the stethoscope while running....obviously any bearing that does not turn reasonably freely is on the verge of freezing up which could also cause the belt to melt or the surface of the belt to glaze over if/when it does completely freeze....

cliff

https://www.amazon.com/s/?ie=UTF8&k...vtargid=kwd-6860464181&ref=pd_sl_48ukdy80v6_e

That tool is amazing, I used a long screwdriver, held to my ear, to find noises when I was a kid

 

[CliffA]

That tool is amazing, I used a long screwdriver, held to my ear, to find noises when I was a kid

I used an old wooden broom handle.....when you have no money as when I was a teenager you had to improvise....that is how I learned to do a little work on my cars....when they broke down I had to fix them or they didn't get fixed....didn't have the money to pay someone to fix them....

cliff

 

[Gucci]

you can take the belts off and start the engine for a few seconds....if the squealing stops you know you have a problem with the tension of the belt or a bearing in one of the pulleys that is being driven by the belt...sometimes you can find a bad bearing by simply spinning the pulleys by hand with the belt removed but I like to use a mechanics stethoscope to listen to the bearings while they are under load from the belt and being spun by the engine....a bad bearing will produce a grinding noise through the stethoscope while running....obviously any bearing that does not turn reasonably freely is on the verge of freezing up which could also cause the belt to melt or the surface of the belt to glaze over if/when it does completely freeze....

cliff

https://www.amazon.com/s/?ie=UTF8&k...vtargid=kwd-6860464181&ref=pd_sl_48ukdy80v6_e

I ordered it, thanks.