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  #11  
Old 05-18-2013, 04:22 PM
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Quote:
Originally Posted by Engine Nut View Post
You can prevent electrolysis from attacking the plugs in the manifolds by separating the quick drain hose that runs between the manifolds and draining them any time the boat is going to sit unused for more than a couple of days. No electrolyte ... no electrolysis.

Thanks Engine Nut!!! I'll have to make this part of my clean up routine now.
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  #12  
Old 05-18-2013, 11:00 PM
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Originally Posted by snork View Post
get yourself some gaskets when re-installing the headers or risers
Ok good to know
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  #13  
Old 06-29-2013, 09:55 PM
jslo jslo is offline
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Mcx manifold lifespan?

Is 8 years considered reasonable service life for the factory manifolds? This 2005 mcx 5.7 started leaking at one of the welded plugs and the others look like they could go anytime.
And........the MC trailer is rusting to pieces under the boat.....all this after only 8 years of service. I fear I had too high expectations for the MC having owned other types of boats my whole life (I'm 53) and never had a trailer rust or a manifold go away with me.
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  #14  
Old 06-29-2013, 10:11 PM
snork snork is offline
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depends where or what lake in texas you dunk your boat and trailer in
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  #15  
Old 04-13-2015, 08:17 AM
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*bump*
Old thread, but after wintersleep, when I visited my boat last saturday, I did find my MCX with two holes in the plugs of one exhaust manifold. Bummer, I am pretty sure I did not leave her this way last autumn...

The other plugs seems fine, even with a little stress from a hammer.

The boat is from 2004 and has 636 hours on the clock. Since 2009, the boat is mine where she did not see salt water. Before that? I don't know.









Next saturday she is going to an repairshop where they can weld aluminium. Lets hope I do not have to remove the manifold....
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  #16  
Old 04-13-2015, 09:22 AM
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I suspect the manifold will have to come off. That damage is caused by electrolysis. The plug is more electrically active than the manifold so it acts like an anode. When water is in the manifold that has a high mineral content, the water acts as an electrolyte. If you remember back to 5th grade science, when two dissimilar metals are exposed to an electrolyte, a small amount of electrical current is produced and the anode is consumed.To prevent that from happening in the future, drain the manifolds by disconnecting the manifold crossover hose when the boat is going to sit for more than a couple of days.
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  #17  
Old 04-13-2015, 09:50 AM
Gert Gert is offline
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Originally Posted by Engine Nut View Post
To prevent that from happening in the future, drain the manifolds by disconnecting the manifold crossover hose when the boat is going to sit for more than a couple of days.
I did see that. But, during winterizing I did not see anything. So since November last year, the manifold did not see any water. But eventhough, four of five months later the plugs are gone??

And, is every MCX having this problem or only some "mondaymorning" items?
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  #18  
Old 04-13-2015, 11:16 AM
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I suspect that there was some water that didn't get drained from the manifold.
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  #19  
Old 04-13-2015, 11:28 AM
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There is another thread here showing the same issue on these manifolds.

seems like an issue over time - most marine manifolds are spec'd to last 500ish hours before they need to be replaced.

http://www.mastercraft.com/teamtalk/...ad.php?t=58715
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  #20  
Old 04-22-2015, 10:44 AM
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Holes are fixed now. Luckily the manifold could stay in place. A local truckshop took about 30 minutes to weld it. Pretty easy.

Welded:



Primering:



Back in color:



Me happy...
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