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09-06-2010, 17:36
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#1
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Registered User
Join Date: Sep 2008
Location: Western KY
Boat: Morgan 321, BELIEVE
Posts: 203
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Cleaning Exhaust Manifold / Mixing Elbow
The water inlet on the mixing elbow of my 3GMD is totally blocked. When I removed the elbow I found the exhaust manifold outlet is ~ 40% blocked with carbon.
Question: Should I use mauratic acid to remove the carbon buildup from the manifold and elbow?
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09-06-2010, 17:44
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#2
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Registered User
Join Date: Oct 2008
Location: Norfolk, VA
Boat: Freedom 32 (Hoyt)
Posts: 223
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It will be a sort lived fix, I would recommend a new elbow as they should be treated as a 'wear' item and replaced every 3 to 5 years. It wil.l be cheaper than a new engine, which is potentially what could happen if the elbow fails and allow water back into the engine.
__________________
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the memories of a man in his old age, are the dreams of a man in his prime
Pink Floyd - 'Free Four'
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09-06-2010, 17:48
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#3
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Registered User

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 8,462
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http://www.cruisersforum.com/forums/...ons-16273.html
Might want to read the linked thread and severl others that you will find listed at the bottom of this thread.
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09-06-2010, 18:00
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#4
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Eternal Member
Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
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This has been discussed ad nauseaum on other threads. In salt water these elbows last 3-5 years. Replace the elbow/special nut.
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09-06-2010, 18:03
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#5
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Registered User
Join Date: Sep 2008
Location: Western KY
Boat: Morgan 321, BELIEVE
Posts: 203
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The elbow isn't damage that I can tell. There is just a lot of carbon build up. Plus the sediment from my water heater that blocked the water intake. I have pictures, but I don't know how to add them to my post.
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09-06-2010, 18:07
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#6
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Registered User
Join Date: Sep 2008
Location: Western KY
Boat: Morgan 321, BELIEVE
Posts: 203
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I forgot to say I'm in fresh water.
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10-06-2010, 04:11
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#7
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Registered User
Join Date: Jun 2005
Posts: 1,901
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You'll be the 11ty billionth person who cleans, then later replaces the elbow. The parts are not expensive just replace them
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10-06-2010, 05:02
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#8
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Registered User
Join Date: Jun 2007
Posts: 853
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10-06-2010, 22:18
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#9
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Registered User
Join Date: Feb 2009
Location: A real life Zombie from FL
Boat: Gulfstar 53 - Osiris
Posts: 5,416
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A quick clean-out can be done by putting several layers of masking tape over the external threads to protect them and then take the elbow to a local "sand blaster" and have them blast out the inside of the elbow. Then measure the thickness of the walls of the unit. You will probably find them quite thin when compared to a new elbow. Normal experience is that after spending a lot of time cleaning and inspecting you end up replacing the unit - so why bother doing all the cleaning?
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11-06-2010, 06:41
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#10
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Eternal Member
Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
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CB's and I don't mean Citizens Band........It never ceases to amaze me......but then again, that's what keeps me in business.
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14-07-2010, 03:55
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#11
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Registered User
Join Date: Jul 2010
Posts: 1
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Quote:
Originally Posted by Duke 48
I forgot to say I'm in fresh water.
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Have you replaced them?
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14-07-2010, 04:16
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#12
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Registered User
Join Date: Dec 2009
Posts: 2,959
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Muriatic acid does not dissolve carbon. Sandblasting, wire brush, careful cleaning followed by buying a new one is the best route
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