Mixing Elbow, Yanmar 3GM30F

upsidedown · 18-01-2009, 12:25

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.

cal40john · 18-01-2009, 12:37

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

John

never monday · 18-01-2009, 16:28

it's not preventable. The elbow is a maintainance item.

Boomp · 18-01-2009, 17:13

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!

Cherp · 18-01-2009, 18:01

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?

never monday · 19-01-2009, 05:51

all the injection elbows can accumulate build up. Some are better than others. I'm not familiar with what was installed on that Vetus.

Jacana · 19-01-2009, 14:09

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.

Badsanta · 22-01-2009, 19:56

replace it, It is a ware item

18-01-2009, 12:25	#1
upsidedown Registered User Join Date: Jul 2008 Posts: 14	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.

18-01-2009, 16:28	#3
never monday Commercial Vendor Join Date: Jun 2005 Posts: 1,442	it's not preventable. The elbow is a maintainance item. __________________ www.inlandmarinediesel.com

18-01-2009, 17:13	#4
Boomp Registered User Join Date: Apr 2008 Location: So.Shore, Massachusetts Boat: Morgan OI 30' Itinerant Posts: 154	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! __________________ A man who is not afraid of the sea will soon be drowned, he said, for he will be going out on a day he shouldn't. But we do be afraid of the sea, and we only be drowned now and again. J.M.Synge, in The Aran Islands

19-01-2009, 05:51	#6
never monday Commercial Vendor Join Date: Jun 2005 Posts: 1,442	all the injection elbows can accumulate build up. Some are better than others. I'm not familiar with what was installed on that Vetus. __________________ www.inlandmarinediesel.com

22-01-2009, 19:56	#8
Badsanta Registered User Join Date: Oct 2007 Location: virginia Boat: islandpacket Posts: 372	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.

18-01-2009, 12:37	#2
cal40john Registered User Join Date: Dec 2006 Location: Seattle Boat: Cal 40 Posts: 592	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 John

18-01-2009, 18:01	#5
Cherp Registered User Join Date: Nov 2008 Boat: Swanson 36 cutter Posts: 49	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?

19-01-2009, 14:09	#7
Jacana Registered User Join Date: May 2006 Location: Queensland, Australia Boat: Maxim 38 ft catamaran Posts: 86	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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