SailNet Community - Reply to Topic

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > Boat Builders Row > Pearson > Yanmar 2GM20F mixing elbow Pearson 31-2
 Not a Member? 


Thread: Yanmar 2GM20F mixing elbow Pearson 31-2 Reply to Thread
Title:
  

By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
01-12-2014 01:55 AM
engdude62
Re: Yanmar 2GM20F mixing elbow Pearson 31-2

Dave, very nice design.
Did you take any pictures showing the internal water down pipe and how it was assembled. If so please share and if not please give me a little more detail on construction of the internal water down pipe. Once installed did you wrap any type of insulation around the exposed pipes or use some kind of a heat shield? Roger
11-29-2013 09:10 AM
ChrisYSE12
Re: Yanmar 2GM20F mixing elbow Pearson 31-2

Dave,
If possible would you resend pictures of your exhaust design. All I see is an blank shape of a square with the words "Attached Thumbnails" inside. I just bought a 1989 Catalina 34 and to be safe, I plan to remove and inspect the mixing elbow. thanks
11-07-2013 07:48 PM
Neo*
Re: Yanmar 2GM20F mixing elbow Pearson 31-2

I know what you mean regarding the Yanmar pricing on a replacement exhaust elbow. That is why we reconditioned (chiseled) the old elbow and reinstalled it. I'll take a closer look at your set up. Maybe I'll use it if our old elbow is clogged up again.

Are those tapper threads on the pipes? Did you use a thread sealer? What grade pipe did you use?
11-07-2013 12:49 PM
Dave Montgomery
Re: Yanmar 2GM20F mixing elbow Pearson 31-2

Neo, I was only mad when I priced out the OEM part from Yanmar!! :-). Your concerns are valid but compensated for. Yes there is an internal pipe which extends downward from where the raw water exhaust enters at the top. This takes the raw water down past where the exhaust enters. One would figure though that even with out that internal pipe the vertical nature would take the water past the exhaust entrance. As in my post, the system has worked very well so far with about 20 hours of use. Much better engine temps, way more water getting through and far less engine exhaust congestion. Somebody mentioned engine back pressure being negatively altered but my understanding is the more exhaust flow the more GO!!
11-07-2013 05:42 AM
Neo*
Re: Yanmar 2GM20F mixing elbow Pearson 31-2

Holy Crap, your a mad man. I like it, but I would be worried about water flowing back into the exhaust manifold when the engine is turning over but not firing, i.e. not exhaust pressure. Is there an internal pipe that carries the water past the exhaust entry?
10-21-2013 01:12 AM
Dave Montgomery
Re: Yanmar 2GM20F mixing elbow Pearson 31-2

Here is what I did with my 3gm30. Took it out this past weekend for three days of motoring and sailing and the engine has never "seemed" to run as good! Smoother and way more cooling water and exhaust getting through. This was a cheap solution to the mixing elbow issue. It will be interesting to see how long it will last. The ports are significantly larger for both exhaust and water. Somebody questioned whether this might be a problem because of engine designed back pressure??? Well all I know is my F250 diesel wants the biggest exhaust I can get on it...
08-28-2013 03:07 AM
Neo*
Re: Yanmar 2GM20F mixing elbow Pearson 31-2

Update: We ended up re-using the joint (I couldn't unscrew it anyway) and the clogged elbow, after chiseling away the blockage. We used non-permanent permatex (I think that is the blue as opposed to the red) when we screwed the joint back into the exhaust elbow. We also replaced the gasket where the exhaust elbow bolts to the cooler. It was not necessary to use any treatment on the gasket.

She's been good so far this season. Starts like a charm.

Oh yeah, when I was torquing the bolts holding the elbow to the block, they felt like they were stretching too much, so I stopped rather than break one of them and order new bolts. It may have been my imagination, but better safe than sorry.
01-06-2013 07:05 PM
Neo*
Re: Yanmar 2GM20F mixing elbow Pearson 31-2

Quote:
Originally Posted by PorFin View Post
Neo,

Looks like both your flange and your elbow are aluminum.

You might want to try applying a little (maybe a lot) of heat to the pipe coupler (your "joint") to try and get the two apart.

As for cleaning out the inside of the mixing elbow: If it is aluminum, you'll need to be careful if you want to try boiling it out. Radiator shops usually have set ups to do this, but make sure you you talk to the owner/foreman and discuss the risk up front.

For DIY, I'd think about letting it soak in Spray Nine for a while first, to see if that helps loosen things up a bit. Carb and/or brake cleaner might also be somewhat effective.
The elbows do look aluminum in the picture, but by weight, they're definitely steal. The joint is stainless, I think.

The parts shop offered to use an acetylene torch when we bring it in next week, but if they tell me I can reuse it, then I don't need to remove it. As for the mixing elbow, I'll pass your de-crudding suggestions on to my buddy whose been working on it. Thanks.
01-06-2013 06:53 PM
Neo*
Re: Yanmar 2GM20F mixing elbow Pearson 31-2

Quote:
Originally Posted by Faster View Post
3M, Locktite and Permatex all make a 'high temp gasket sealant' which I'd probably use rather than regular telfon tape.. I used it on our mixing elbow connections a year ago and it's holding up well.
Thanks, I'll look into alternative sealants. I was thinking that the exhaust would be cool enough by then, but now that you mention it, the joint is upstream of the water port in the mixing elbow.
01-05-2013 06:38 PM
PorFin
Re: Yanmar 2GM20F mixing elbow Pearson 31-2

Neo,

Looks like both your flange and your elbow are aluminum.

You might want to try applying a little (maybe a lot) of heat to the pipe coupler (your "joint") to try and get the two apart.

As for cleaning out the inside of the mixing elbow: If it is aluminum, you'll need to be careful if you want to try boiling it out. Radiator shops usually have set ups to do this, but make sure you you talk to the owner/foreman and discuss the risk up front.

For DIY, I'd think about letting it soak in Spray Nine for a while first, to see if that helps loosen things up a bit. Carb and/or brake cleaner might also be somewhat effective.
This thread has more than 10 replies. Click here to review the whole thread.

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


All times are GMT -4. The time now is 11:51 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.