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Old 18-01-2009, 11:25   #1
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Mixing Elbow, Yanmar 3GM30F

I have a Yanmar 3GM30F. After about 1000 hours, my engine began overheating. I went through the process of elimination only to discover that the mixing elbow was nearly closed from carbon build-up.
1. How can I prevent carbon build up?
2. How does one clean a mixing elbow.

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Old 18-01-2009, 11:37   #2
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My 3GM30F is new enough that I haven't done the elbow yet, but due to corrosion it is recommended to change out the elbow after about 2 years. If it corrodes through the water will get into your engine and ruin it.

Carbon build up can be from not running the engine under enough load.

This link talks about buildup.

Tips on Yanmar Diesel Engine Maintenance


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Old 18-01-2009, 15:28   #3
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it's not preventable. The elbow is a maintainance item.
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Old 18-01-2009, 16:13   #4
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Makes sense to change it.

I changed mine last summer. It was just as you described and a diesel upkeep course I took said to be prepared to change them when carbon chips build up. Makes sense to do it every 2 years as stated above. [make sure you replace the hose and really tighten the clamps!
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Old 18-01-2009, 17:01   #5
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Never Monday - I have a Vetus marinew diesel. Does the carbon build-up happen with the elbow in these? Should they be a maintenance item?
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Old 19-01-2009, 04:51   #6
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all the injection elbows can accumulate build up. Some are better than others. I'm not familiar with what was installed on that Vetus.
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Old 19-01-2009, 13:09   #7
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Take the elbow off and mix 50/50 water and pool acid carefully dip elbow in ,I use a piece of rope and lower it in from a short distance then watch as all the gunk comes out.Dont believe 2 years for replacement guess if you use your motor regularly should last a lot longer mine currently 6 years about 2000 hrs.Cheers Geoff.
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Old 22-01-2009, 18:56   #8
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replace it, It is a ware item

That derelict boat was another dream for somebody else, don't let it be your nightmare and a waste of your life.
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3gm, 3gm30, elbow, yanmar

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