My E38 is back in the water and its making a very strange noise when in gear. Sounds like a mid-pitch moaning, fairly loud, that occurs between 1200-1600rpm. Above that it seems just audible but I'm not sure I'm actually hearing it and no noise at idle. Only seems to do this in forward. I did notice on the hard that when I rotated the prop by hand I got a similar low moaning noise. Engine is a Universal 5432 with a Hurth trans.
-The transmission has fluid in it of the correct type, at the correct level, it is clean and clear, no debris. It was clean and clear when I changed it last year.
-The cutlass bearing has very minimal play in it, less than 1/32"
-The packing is correctly adjusted, the packing assembly does not heat up at all even after 1/2hr of motoring. 1 drip every 10 seconds when motoring and less at rest.
-Transmission shifts perfectly, is cool to the touch even after 1/2hr motoring.
-Shaft spins easily by hand, smooth.
The only thing I have left to check is that the cables are properly adjusted as they were replaced this winter. IIRC, I did this already but will check again. Is it possible that this is just a "harmonic" noise when everything starts vibrating at the same frequency? With the exception of the noise everything is very smooth, etc.
Any ideas? RT
-The transmission has fluid in it of the correct type, at the correct level, it is clean and clear, no debris. It was clean and clear when I changed it last year.
-The cutlass bearing has very minimal play in it, less than 1/32"
-The packing is correctly adjusted, the packing assembly does not heat up at all even after 1/2hr of motoring. 1 drip every 10 seconds when motoring and less at rest.
-Transmission shifts perfectly, is cool to the touch even after 1/2hr motoring.
-Shaft spins easily by hand, smooth.
The only thing I have left to check is that the cables are properly adjusted as they were replaced this winter. IIRC, I did this already but will check again. Is it possible that this is just a "harmonic" noise when everything starts vibrating at the same frequency? With the exception of the noise everything is very smooth, etc.
Any ideas? RT