SailNet Community - View Single Post - Bumping/Thumping Noise-Advice Needed
View Single Post
Old 06-20-2011
kd3pc's Avatar
kd3pc kd3pc is offline
Senior Member
Join Date: Oct 2006
Location: Callao, VA
Posts: 1,357
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 9
kd3pc is on a distinguished road
It appears that your boat has a water lift style muffler/mixer...if may be looking at a broken baffle as you indicate the periodic thump gets worse when the thru-hull is submerged...that would put more back pressure on your exhaust system and perhaps cause something loose in the waterlift/mixer to do the thumping...I think that is what I see in your rear engine segment...

Contrary to the others, I do not think it is shaft or bearing, as it does not happen at the dock...were something out of whack there, one would think you would see it any time the engine is running
Reply With Quote Share with Facebook