Can a impeller in a Cobra drive make a medium to high pitch howling noise?
I am getting a howling noise from my 1989 5.7 Cobra drive at 3000 rpm and above.
I guess it could be a gimbal or some other bearing or even gear noise, but I was thinking of looking at the simple stuff first.
The impeller was changed about 80 hours ago or almost exactly one year ago so it isn't new but not real old.
Also the gear lube was changed 60 hours ago and i am using the the Evinrude HPF XR high performance gear lube and I took a look at the lube a month ago and the level and color where good.