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Old 07-14-2015, 09:26 AM   #1
City: Baltimore
Country: Baltimore Co.
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Exhaust Leak

I have an old Westerbeke 4.4 generator and can't find the exhaust leak that is filling the engine room with carbonmonoxide. Does anyone have a suggestion of where or how to search for the leak?

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Old 07-14-2015, 09:30 AM   #2
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Welcome aboard. CO? BAD stuff...


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Old 07-14-2015, 09:47 AM   #3
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No real secret technique. Start engine and crawl around and look for leaks. Anything downstream of mixing elbow will not only leak exhaust, but water.

Make sure blowby tube is going to air intake, too.

Diesel should not be making much CO unless it is sick.

CO can also be drawn back into vents from tailpipe.

Be careful, don't troubleshoot alone!!
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Old 07-14-2015, 11:46 AM   #4
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I thought my Onan was making exhaust but it turned out that the fuel pp seal had failed and the motor and points were submerged in fuel. Only mentioned that because there might be another cause. Acrid smell.

Particulate matter from diesel exhaust is very bad for you, wear a mask! Like Ski says, don't do it alone!
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Old 07-17-2015, 01:43 PM   #5
City: Baltimore
Country: Baltimore Co.
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Thanks for the responses! I will have another look around this weekend. That's good info about checking only upstream of the mixing elbow. unfortunately it's not too easy to get aground the generator where it is located.
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Old 07-17-2015, 04:01 PM   #6
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Check your exhaust manifold if it's a cast iron one it may have cracked with age and need replacing. I had the same issue on our Northern Lights gen and replaced it with a stainless one and no more smell.

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generator exhaust leak, westerbeke 4.4 generator

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