Cruisers Forum
 

Go Back   Cruisers & Sailing Forums > Engineering & Systems > Engines and Propulsion Systems
Cruiser Wiki Click Here to Login
Register Vendors FAQ Community Calendar Today's Posts Log in

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 22-06-2019, 06:58   #16
Registered User

Join Date: Jan 2014
Location: Ft. Lauderdale
Boat: Watkins 29
Posts: 409
Re: Yanmar Exhaust Elbow - Source of leak?

Quote:
Originally Posted by bostonbubba View Post
Hello,


Long time lurker, finally posting. Running into an issue with an exhaust elbow for a Yanmar 2GM20F that I could use some input on.



I replaced the exhaust riser, coupling, and exhaust elbow at the beginning of last season as the old one had reached the end of its lifespan. Everything ran great last summer through winterization. Fast forward to this season, replaced the impeller, recommissioned the engine, and everything looked fine again. However, now I am getting a small leak at the coupler junction (the double threaded piece that connects the riser to the elbow).




In theory, there shouldn't be any water at that junction, just exhaust. Water is coming out the exhaust at the transom as expected. I pulled everything off to have a look and the elbow looks fine, no cracks/holes. I put it back together with Hercules Real-Tuff teflon thread sealant (hand tightened with a 90 degree bend), put it back on and still same issue. The engine appears to be running fineI am wondering if there might be some sort of blockage in the wet exhaust hose further down stream but then why would water still be coming out? I could run a snake from the muffler back to see if there is any thing in there.


Any thoughts would be greatly appreciated. Thanks in advance.







Back pressure from the muffler???



Just reaching for straws... and looking for an inexpensive solution! Good luck. Let us know when you find out where its coming from.




Thoughts on where is the water coming from?
dennismenace111 is offline   Reply With Quote
Old 23-06-2019, 17:50   #17
Marine Service Provider

Join Date: Sep 2014
Location: Auckland, NZ
Boat: Compass 790 , 7.9 metres or 26 ft
Posts: 2,813
Re: Yanmar Exhaust Elbow - Source of leak?

yes bit of a tricky one given you have a newish elbow. Id recommend a stainless mixing elbow from exhaust elbow.com or the HDI marine one rather than Yanmars one if you find you need another
I'd be suspecting a crack too. The fatal flaw in the Yanmar design mixing elbow is that any leaks on riser side dump water back into head. Even a little leak will cause valve pitting & bore water damage ( Ask me how I know) I fabricated an elbow that injects water only on downhill side after elbow to avoid the issue reoccurring
You need to find the problem but yes it maybe back pressure related.. I dont know.
Compass790 is offline   Reply With Quote
Reply

Tags
elbow, exhaust, yanmar


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Yanmar 2GM20F Exhaust Mixer/Elbow kiltym Engines and Propulsion Systems 37 16-02-2017 17:58
Exhaust elbow for Yanmar 3jH2-TE DevlinMike Engines and Propulsion Systems 0 18-09-2014 10:37
[SOLD] Yanmar Exhaust Mixer Elbow SailorHarry Classifieds Archive 5 08-06-2012 14:12
Yanmar OEM Exhaust Elbow or After-Market ? zippy Engines and Propulsion Systems 8 26-07-2011 05:36
Yanmar 1GM10 Exhaust Elbow and Carbon troppo Engines and Propulsion Systems 9 13-12-2010 06:23

Advertise Here


All times are GMT -7. The time now is 09:21.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.