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try Yachtx.com I have my boat under contract, hopefully goes through this week. My recent learning: First of all watch out for scams - had at least 5 attempts "to send me money / cashiers check , right now, to hold the boat while they arrange picking it up sight unseen, on behalf of a buyer...

Loud Air horn noise Problem solved - Update Finally resolved the loud air horn type noise at high rpm - It was a loose clamp on the turbo intake hose. The noise shot backwards and sounded like it was coming from the stern area, but actually was at the engine turbo. Our technician put a...

Problem solved - Update Finally resolved the loud air horn type noise at high rpm - It was a loose clamp on the turbo intake hose. The noise shot backwards and sounded like it was coming from the stern area, but actually was at the engine turbo. Our technician put a pressure test on the...

We were, and that caused a noise at 1800 rpm, but replaced everything now, , dripless, cutlass, mounts, shaft included. Its still there.

Very helpful. I downloaded the article and will test the brush to see if that is the noise. Thanks.

When we splashed the boat after the work was complete, first thing we did was check water flow to the dripless, it was fine. We do have a theory that at high rpm water flow may be somehow slightly restricted (perhaps the heat exchanger) causing the noise. thanks for the comment.

interesting - Will look into the prop as potential source of my issue, thanks.

Thanks for the suggestion - we just had it pulled, cleaned and re-worked. But will discuss this with the prop shop that did the work.

My previous boats, every survey does a sea trial and with WOT as part of the inspection. Maybe I am using the wrong surveyor. :)

On our 2000 Nordic Tug 37, we recently experienced a very loud air horn type of noise from the shaft / prop area. It only occurs at very high rpm ( basically max), after about 20 seconds and the boat planes. Just finished haul out, replaced dripless, cutlass, the shaft, engine mounts (for other...