My 261 has been giving me a sound for a while. I thought it was from the water pump which was going to be changed to Dave's repositioning adapter and new pump so I didn't worry. I decided to check that theory yesterday. I removed the fan belt and the sound persisted. Yikes!
The noise starts at about 1300 RPM and is gone at about 1700 RPM but maybe it's so high pitched only the dog can hear it. The sound is louder when placing a stethoscope end on the crankcase vent tube than the valve cover. More yikes!
Click for a video. What are your best bets for the source? Any other checks I can make?
Noise Starts at 1300 RPM.
