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post #1 of 7 Old 02-02-2010 Thread Starter
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mixing elbow carbon build up

I have my Yanmar 2GM mixing elbow apart. I'm wondering if there's a good way to clean the carbon build up from inside the elbow aside from trying to scrape it clean. Some parts are pretty hard to access.
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post #2 of 7 Old 02-03-2010
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Not generally worth cleaning it out...generally better to just replace it...

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post #3 of 7 Old 02-03-2010
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Combustion chamber cleaner, may work. At any local auto pars store.

Why, why, why?
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post #4 of 7 Old 02-03-2010
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I've cleaned one from a Perkins in a pinch using rotary rasps on a battery powered drill, it took all day and was a PITA.(not to mention it being freakin' environmental disaster)
Rotary Rasps
a grinder may also work, However, the guy at the "old school" Radiator shop I use has a sand and bead blaster and I'll try him if I ever need it done again. Besides the 'hard as a rock' nature of the coke (?) you are trying to remove, reaching far enough in and cleaning smaller water passages are often more difficult.
capnblu's suggestion made me think of brake cleaner which seems like it should break it up also.

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post #5 of 7 Old 03-23-2010
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Replace is best and then bust off the big pieces and sand blast it clean in one of those glove-box sand blast units. They are clean, neat and self-contained. Keep it for a spare.
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post #6 of 7 Old 03-23-2010
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Don't be so cheap!!! Ask any Yanmar dealer when you are going cruising what should be on the shopping spares list...you will be told a mixing elbow. This should also be on any 10 -15 YO sailboat spares engine list. Don't wait, don't clean it, it will "blow", as it is usually a cast iron piece.
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post #7 of 7 Old 03-24-2010
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Better to replace with new. I tried cleaning mine, chiselling & drilling didn't work an iota. Replacement is the way to go.

Ken
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1999 Macgregor 26X, SV Millennium
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