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  #1  
Old 07-16-2008
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Clogged Exhaust or Mixing Elbow: Clean or Replace?

The topic of soot build-up in the exhaust elbow and/or mixing elbow has been mentioned several times, but I wondered what the general wisdom was about cleaning vs. replacement. Can these items be cleaned when they get clogged or should they just be replaced? If they can be cleaned, are there any tricks? Thanks for any advice.
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Old 07-16-2008
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Well if its in good enough shape, why not clean it out. If its rusted or in too bad of shape, remove and replace. As far as cleaning, im not sure how to go about that. I figure just remove it and clean it out with a stiff wire brush. That would be my go at it.
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Old 07-16-2008
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I hacd my elbow cleaned last Winter. It was removed and then "pickled" like they do for a heat exchanger. When it is off the boat they can tell whether it needs replacement or only cleaning.
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Old 07-16-2008
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Originally Posted by oft View Post
The topic of soot build-up in the exhaust elbow and/or mixing elbow has been mentioned several times, but I wondered what the general wisdom was about cleaning vs. replacement. Can these items be cleaned when they get clogged or should they just be replaced? If they can be cleaned, are there any tricks? Thanks for any advice.
I was told by a trusted mechanic that they can be easily cleaned. I don't have my notes with me, but he suggested removing then soaking the elbow overnight in a commonly available acid who's name escapes me, but which is available at most hardware stores (muriatic acid, perhaps, possibly oxalic acid?). Hopefully somebody here will know which. I wouldn't recommend guessing!
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I was told you can clean it, but don't expect to double the life span after cleaning it. Often the metal corrodes from the inside out and they eventually crack. Remember, you are dealing with carbon monoxide here.
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Old 07-17-2008
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If the metal is good, a 5% muriatic acid bath will clean it up nicely. Available cheap in the Home Depot...generally near the concrete supplies.
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Old 07-17-2008
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Most automotive engineering shops will have a tub to hot-soak the part in and get rid of all the internal scale for a few bucks.

Talk your locals, they're sure to be able to help.

Andre
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Old 07-17-2008
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The one on the yanmars are a wear item, so they are ment to be replaced every few years
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Old 07-17-2008
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My vote...

My vote is..... REPLACE IT..! If it's old enough to be clogged it's old enough to be replaced.

Many times the damage can't physically be seen until you smash one with a hammer to see the effects of the sulfur in the fuel. This one has be smashed open and you can literally see the corrosion and crumbling metal through the entire thickness of the elbow. This elbow still had clean gray paint on it right next to areas of crumbling metal!!

The elbow its self is SHORT money considering the consequences of a failure at an inopportune moment..

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Old 07-17-2008
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The elbow its self is SHORT money considering the consequences of a failure at an inopportune moment..
Yeah, ours is 18 years old (original), and if I went to the trouble of removing it I'd go ahead and replace with new.
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