7.4 duo prop vibration.

MATTK

Recruit
Joined
Sep 6, 2010
Messages
3
Hey guys, new to the forum .
I have a problem that I'm sure has been covered many times, but gonna ask as searches have not turned up much.
I have a 97 cobalt 220 Volvo duo prop , love everything about the boat EXCEPT , it has a nasty vibration at about 2000 rpms sitting out of gear. When under way the vibration is substancially worse. There is a small sweet spot just after trimming up . Vibration comes on hard a little further up. Boat likes the higher trim angle as speed and rpms increase but vibration scares me. I can also notice a feel similar to trimming issue but when turning.
Local boat dealer has checked the gimbal and says its ok.
Any thoughts ?
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: 7.4 duo prop vibration.

Sounds like bad ujoints to me. Pull the drive and check.
 
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