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Old 07-23-2013, 03:16 PM   #2
LaBomba
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City: Beaverton, Ontario
Vessel Name: Looking Glass
Vessel Model: Carver 370 Voyager
Join Date: Nov 2012
Posts: 1,240
Quote:
Originally Posted by beachbum29 View Post
When my boat is on plane between 2800-3200 RPM, it gets this intermittent vibration. It's deep, can't say you can really feel it but you can hear it, almost like a bass drum. Kinda like a HMMMMM...

I just had a diver go under and check things out. He says that on each prop one blade is out maybe 1 CM. The shafts feel tight with no play, nothing was tangled on the shafts. He did say that they spun easily but he could feel some type of metallic sound coming from them much like a tire on the road.

My boat has 7.4 gas motors with V-drives. ZF Hurths Model: HSW630V1-2.5.

Any ideas / suggestions would be greatly appreaciated.

Dave
When I used to have twins I would get what you are describing when the engines were not synchronized. Have you tried adjusting engine speeds?? If your using an engine synchronizer maybe it is out of calibration. Just a thought.
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