Ringing noise from gear

[Aqualund1981]

I have a ringing noise coming from the port engine running gear between 1200-1500 rpm.
Noise goes away over 1500 rpm
Is this possible cutlass bearing issue or maybe my Spurs rubbing and riinging.

 

[caltexflanc]

Could be either of those, the transmission, or the prop itself can sometimes make that noise oddly enough. Have you been able to rule out the engine or transmission?

 

[Aqualund1981]

No noise from engine when out of gear at those rpms.
Don’t know how to eliminate transmission from running gear.

 

[OldDan1943]

How are your shaft grounded?
Could be the noise generated by the grounding strap on riding on the shaft.
I say that based upon my own experience.

 

[Aqualund1981]

Grounding contact is there riding on the shaft.
Did not think of that.
I could pull it off and run to see thanks.
Won’t be till spring but I will try that

 

[High Wire]

Mechanics stethoscope? I keep one onboard for just such a occasion.

 

[bayview]

Dry stuffing box.