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Old 03-27-2016, 12:41 AM   #1
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Default Water in manifolds

I have just purchased a 2003 Maxum 2900 SE I haven't taken possession yet as owner still making repairs. It has twin mercruiser 190 hp 4.3 litres v6 tks engines raw water cooled. Bothe legs are bravo 2 and they have both just been fully rebuilt and the engine shafts replaced. While working on back of engine the mechanic removed the riser to gain access to rear of engine he found water in the manifold and after an engine compression test found 1 cyclinder a little down in compression with evidence of water in cyclinder the manifolds and risers were checked and are ok. There is no water in the engine oil? What do you think went wrong we are thinking a head gasket oh engine done 420 hours.
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Old 03-27-2016, 02:15 AM   #2
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Your manifolds or risers are leaking replace them i say ???
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Old 03-27-2016, 05:06 AM   #3
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A leaking gasket between the manifold and riser if wet exhaust can cause this.

Cylinder one is down so either the head gasket is going or most likely the exhaust valve is bad from burning water due to the bad exhaust gasket.

Has the exhaust ever been changed? It's due if origional and that's both engines.

I say the head needs to come off and rebuilt and the entire exhaust should be replaced.

Very common to see a tuliped exhaust valve at 500 hours due go leaking exhaust in a salt water boat.
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Old 03-27-2016, 08:14 AM   #4
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The manifold and riser have been assessed and all ok. Only 1 cylinder has been effected. Water was noticed in the manifold but manifold ok. Water detected I only 1 cylinder exhaust system would not have been looked at
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Old 03-27-2016, 08:16 AM   #5
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Head Bing assessed this Tuesday so will no more I guess by then
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Old 03-27-2016, 01:05 PM   #6
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Don't care what the mechanic said if salt water cooled the exhaust is nearing end of life with that many hours and still origional.

Your money do as you please just giving you my advice. But as yourself where did the water come from? This is the normal telltale signs of an exhaust leak and yes common that one cylinder only gets water in the beginning stages.
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Old 04-07-2016, 11:28 PM   #7
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Just thought I would update appears the mechanic used to much pressure when flushing test engine. Water was for through the open exhaust valve. Head has been removed cleaned and valves re seated. Work almost completed both engines out the boat and full check up out the engine bay being done. I hope to have boat going in a week. Thanks for input
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Old 04-08-2016, 01:33 AM   #8
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Is there a way to quantify the life remaining of a manifold? Where do they leak from when they rust too much?


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Old 04-08-2016, 02:06 AM   #9
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Quote:
Originally Posted by Moose View Post
Just thought I would update appears the mechanic used to much pressure when flushing test engine. Water was for through the open exhaust valve. Head has been removed cleaned and valves re seated. Work almost completed both engines out the boat and full check up out the engine bay being done. I hope to have boat going in a week. Thanks for input

Not sure I understand. The elbow injects water into the exhaust stream on the downward bend so even high pressure flow should just shoot into the y-pipe and out the drive. What is the explaination on how water got back into the engine?
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Old 04-08-2016, 02:10 AM   #10
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Quote:
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Is there a way to quantify the life remaining of a manifold? Where do they leak from when they rust too much?


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No easy answer but elbows go first. Another common area is the wet joint interface as the wall thickness lessens the gasket cannot provide a hood seal.

BB one I have seen crack around the raw water input.
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