4JHE Yanmar Exhaust Information

[Snowtrail]

Hi there everybody! How's it going?
I just joined up and got a lot of catching up to do. Lots to read here!
Right now, I am wondering if someone can help me out with some information regarding a boat and motor I purchased this past spring. (Really, the motor is the problem)
The motor is.............. a 4JHE Yanmar (44HP).... an excellent working motor. The problem is that this motor is very loud, noisy in the cabin of my boat...... to the point that I can bearly hear someone talking. There is a straight exhaust with a muffler/silencer which, may be pretty well burnt out, attached to the motor. I want to know if this can be changed to a Wet Exhaust. I think it can be and I am told that it probably came with that type of system in the beginning. Can someone shed some light on this? Appreciate the help.............Thanks!

 

[KD3PC]

Our 1991 was wet, I was not aware there were any shipped with the dry???

boat make and model? repowered??

 

[Snowtrail]

Thanks for your reply..............KD3PC.......apprec it! I was not aware of it either until some time ago. I thought it was standard on those motors. So was yours very noisy? Do you have any ideas as to changing this system back over?

 

[KD3PC]

water cooled exhaust and relatively quiet, music and conversation was easy - even underway.

The only way I know to change it back - would be to acquire the original parts to do so, but if they used the space for the water lift muffler and exhaust components - then you would need to restore that space as well as the water lift needs to be a certain distance relative to the engine and the waterline to work properly.

Not sure what would/could be gained by direct exhaust.