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Old 03-25-2018, 05:52 PM   #1
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Coolant exiting my exhaust

120 Lehman when I start up I get coolant coming out exhaust .. just at startup itís visible...at rest there is small amount that itís lost in the expansion tank ... I removed exhaust elbow and I think itís the gasket .. has anyone had this before ?
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Old 03-25-2018, 05:59 PM   #2
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120 Lehman when I start up I get coolant coming out exhaust .. just at startup itís visible...at rest there is small amount that itís lost in the expansion tank ... I removed exhaust elbow and I think itís the gasket .. has anyone had this before ?
it could be the heat exchanger and the raw water pushes it out at start up. Unless it is a dry exhaust
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Old 03-25-2018, 06:00 PM   #3
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Hsve you pressure tested the coolant loop with a radiator tester to see if the heat exchanger is leaking?


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Old 03-25-2018, 06:02 PM   #4
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I heard the heat exchanger has pressure the other way ... I would get raw water in my fresh system
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Old 03-25-2018, 06:04 PM   #5
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There is a gasket behind the exhaust elbow that closes the fresh water in exhaust manifold from going in to elbow ..
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Old 03-25-2018, 08:44 PM   #6
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How do you know there is coolant coming out the exhaust? That sounds improbable to me...
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Old 03-25-2018, 09:05 PM   #7
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Coolant is usually at 15 psi or more. Salt water is not really under pressure, but has a high flow rate. When the engine shuts down and coolant no longer circulates, the coolant next to the cylinders gets overheated and causes the pressure to rise at a time where there is zero pressure on the salt water side. So the common source for coolant in the exhaust is a small leak between the coolant and salt water in the heat exchanger. Typically it would be seen at startup.
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Old 03-25-2018, 10:36 PM   #8
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Coolant is usually at 15 psi or more. Salt water is not really under pressure, but has a high flow rate. When the engine shuts down and coolant no longer circulates, the coolant next to the cylinders gets overheated and causes the pressure to rise at a time where there is zero pressure on the salt water side. So the common source for coolant in the exhaust is a small leak between the coolant and salt water in the heat exchanger. Typically it would be seen at startup.

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Old 03-25-2018, 11:17 PM   #9
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I still want to know how you can see it?
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Old 03-26-2018, 12:03 AM   #10
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I still want to know how you can see it?
First time i roded out our heat exchanger i pinched the oring putting it back together.
Shot a load of bright green coolant out the exhaust on start.
Water for about 1 metre back was fluoro green.
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Old 03-26-2018, 06:56 AM   #11
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Lehman pressure caps are pretty low, 7psi or so IIRC.

But after sgutdown, the fresh water is still under pressure and the raw water isn't.

But which way would the leak go, I am not sure, or if it ultimately goes to both sides of the exchanger.

I replaced the gasket when I installed a new elbow, but not because of a leak.
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Old 03-26-2018, 08:09 AM   #12
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Iím going to change the gasket behind the exhaust elbow which seemed bad and go from there
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Old 03-26-2018, 08:50 AM   #13
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Take zinc out of sea water side of heat exchanger and see if any coolant drips out once sea water finishes draining.
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Old 03-26-2018, 08:53 AM   #14
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But what would that tell me .. I think my leak is before the exchanger..
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Old 03-26-2018, 09:40 AM   #15
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It would tell you if there is an internal leak in the heat exchanger.
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Old 03-26-2018, 09:45 AM   #16
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I will be taking off the exchanger and sending it for cleaning and inspection..will let u no what happened... thanks everybody
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Old 03-26-2018, 09:47 AM   #17
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Talked to AMD they said most probably is elbow gasket or leak in exchanger
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Old 06-01-2018, 10:00 AM   #18
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Where did your leak turn out to be at?

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Old 06-01-2018, 10:06 AM   #19
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I changed the elbow gasket & had my heat changer cleaned and tested ... all installed but waiting to put boat in water .. at least another month yet ... hopefully it should be fine ...canít really be anything else ... I no head gasket is good .. what else is left ??
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Old 06-02-2018, 09:12 PM   #20
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Possible internal crack in the exhaust manifold from heat and corrosion. Also the gasket between the manifold and the elbow. Some manifolds allow for raw water cooling, and need to be blocked off when using coolant.
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