Water intrusion into engine from exhaust

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Joined: Sun Oct 10, 2010 5:04 pm

Water intrusion into engine from exhaust

Post by jgonnerman » Wed Aug 05, 2015 4:01 pm

I recently had a stupid attack which resulted in having to replace the exhaust hose between the exhaust elbow so decided to replace the entire run of hose. (ran engine without raw water, water was flowing when i left the dock but the lid on the strainer which i had cleaned was loose and allowed air to enter and overheated the hose)

As I replaced the hose and got more familiar with it, it occurred to me that the rise from the hull outlet to the high point in the hose run isn't very great. My boat is 12+ years old and water intrusion has not yet been a problem.

My question can the worse case set of circumstances cause a problem. ie backing down with an engine shut down cause water to flow into the engine. I don't know if the muffler can restrict backflow.

Any thoughts?

Thank you
John Gonnerman
San Diego Ca
"Westend Express"
2002 34 Hull 20

1st mate
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Posts: 31
Joined: Sun May 09, 2004 1:58 pm
Location: Erie Canal

Re: Water intrusion into engine from exhaust

Post by Catrina » Sun Aug 09, 2015 6:00 am

Water intrusion can happen. Mine occurred when boat was in fresh water (it sits lower in fresh water) with the stern facing open water. Storm built up waves and had water intrusion. Fix included making the exhaust loop higher and longer, but make sure you have a back pressure test done after the change.

Catrina - MV34 Hull # 55 - 110HP - 4 Blade props

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