Engine Exhaust "Spit" Question

Nodak7

Nodak7

.
Sep 28, 2008
1,256
Hunter 41DS Punta Gorda, FL
We have a Yanmar 4JHE 54hp engine on our 2006 H41DS. As long as I have owned the the boat the exhaust has "spit" out water while running. Not a steady flow but an occasional rush. I have checked and changed the impeller regularly and never found a problem. I have always thought it was normal and never questioned it but I saw a post on another forum that says this is indicative of a exhaust problem. Is that the case? Your thoughts please!
 
sgiarc

sgiarc

.
Feb 12, 2019
47
beneteau 461 port colborne
Every diesel I have ever had spits out water in spurts. It seems to build pressure and then release it.
 
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TomY

TomY

Alden Forum Moderator
Jun 22, 2004
2,768
Alden 38' Challenger yawl Rockport Harbor
Nodak7 said:
We have a Yanmar 4JHE 54hp engine on our 2006 H41DS. As long as I have owned the the boat the exhaust has "spit" out water while running. Not a steady flow but an occasional rush. I have checked and changed the impeller regularly and never found a problem. I have always thought it was normal and never questioned it but I saw a post on another forum that says this is indicative of a exhaust problem. Is that the case? Your thoughts please!
Click to expand
No it is not. An occasional rush of water out the exhaust port is how a waterlock muffler works. Raw water squirts into the hot exhaust and collects in the bottom of the waterlock. Once the water reaches the outflow standpipe, a few inches above the bottom of the waterlock, exhaust pressure forces the water up the standpipe and out the exhaust hose, along with the exhaust gases.
 
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Rich Stidger

Rich Stidger

.
Feb 10, 2004
4,152
Hunter 40.5 Warwick, RI
I have seen both indications. IMHO it is not a problem. My genset is well above the water line and the cooling water runs completely down hill through the muffler and exits the hull. That cooling water runs continuously.
My auxiliary is below water line and the water fills into the muffler until it blocks the output port and then the exhaust blows out a blast of water. Or spit of water as you describe.
Relax. You're good.
 
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Nodak7

Nodak7

.
Sep 28, 2008
1,256
Hunter 41DS Punta Gorda, FL
As I thought but just wanted to make certain! Thanks all for your responses! It helps to have resources!
 
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D

Don Lucas

.
Jan 12, 2011
930
Hunter 410 full time cruiser
Nodak7 said:
We have a Yanmar 4JHE 54hp engine on our 2006 H41DS. As long as I have owned the the boat the exhaust has "spit" out water while running. Not a steady flow but an occasional rush. I have checked and changed the impeller regularly and never found a problem. I have always thought it was normal and never questioned it but I saw a post on another forum that says this is indicative of a exhaust problem. Is that the case? Your thoughts please!
Click to expand
mine does the same
 
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JamesG161

JamesG161

SBO Weather and Forecasting Forum Jim & John
Feb 14, 2014
7,812
Hunter 430 Waveland, MS
The "spit" volume changes if you are motoring with some waves.

If your muffler doesn't "spit", you may be in trouble with over heating.
Jim...
 
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