Replacing exhaust elbow and plumbing on Universal M12 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Chat  
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 > On Board > Gear & Maintenance > Engines > Diesel
 Not a Member? 
  #1  
Old 08-14-2013
Joel73's Avatar
1987 Pearson 27
 
Join Date: Apr 2007
Location: NC
Posts: 1,581
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
Joel73 has a spectacular aura about Joel73 has a spectacular aura about Joel73 has a spectacular aura about
Replacing exhaust elbow and plumbing on Universal M12

Hey guys... hope all is well. I'm looking for some advice about plumbing for the exhaust on my Universal M12. I had planned on replacing this stuff last year as it was in obvious need of attention but that slipped down the list as i was working on other things. You know how it goes when working on a tight budget. Anyway... I have located and ordered the replacement exhaust elbow made by Onan. Interestingly, the part number that was cast into the side of the original part has been changed over time and is totally different now. Original number was 170-2834... the new number (for the same size part) is 155-1058. I eventually located it at Coastal Diesel Service in New Bern, NC. Home
So... on to my question: What is the correct type of pipe to use from the exhaust flange to the exhaust elbow? I have read that i should use black iron but that i can also use galvanized steel. The thoughts about using the galvanized steel was that there would be a period of time where it would need to "cure" and that it would give off an odor until it was broken in. Other than that it seemed to be the opinion that galvanized would be fine. What are your thoughts? I've already purchased galvanized because it was readily available but will exchange it if i find any major reasons that i should avoid it. Thanks for taking the time to read... any advice is welcome.

Original piping, elbow...


New galvanized piping... will this be ok?


Old piping and exhaust elbow removed. It was a messy job! I had to disconnect the heat exchanger for clearance and between the spilled coolant and the carbon, it made a huge mess. I do my best to keep things clean but obviously have some cleaning and degreasing to do here...
__________________
Quote:
"Unthinking respect for authority is the greatest enemy of truth." - Albert Einstein

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 08-18-2013
JimsCAL's Avatar
Senior Member
 
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,581
Thanks: 2
Thanked 51 Times in 46 Posts
Rep Power: 8
JimsCAL is on a distinguished road
Re: Replacing exhaust elbow and plumbing on Universal M12

Black iron will give you a longer life, but the galvanized is OK. Since you have it, go ahead and use it. When I redid the exhaust on the Universal 5411 (M15) on my previous boat, I found all the black iron I needed at Home Depot.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 11-13-2014
Junior Member
 
Join Date: Nov 2014
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
pfsnyder3 is on a distinguished road
Re: Replacing exhaust elbow and plumbing on Universal M12

This thread of posts has been really helpful to me. Thanks!
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 11-13-2014
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 3,230
Thanks: 20
Thanked 121 Times in 111 Posts
Rep Power: 15
RichH will become famous soon enough
Re: Replacing exhaust elbow and plumbing on Universal M12

Quote:
Originally Posted by Joel73 View Post

New galvanized piping... will this be ok?
Not as good as 'black iron' but should be OK.

I make the recommendations:
1. to 'brace' that heat riser to the engine with a triangular structure (from the top of the riser to the engine) to prevent/lessen the heat riser from vibrating at an independent vibrational frequency than the engine.
2. seal the threads with automotive 'muffler cement' -- partly fit the threads dry, and with the muffler cement applied to the last 'few' in-contact threads, then run the assembly 'home' to seal.
3. Apply heat lagging to the external surfaces to help contain heat in the piping - a woven fiberglass 'tape' with NO binders.

;-)
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 11-13-2014
Junior Member
 
Join Date: Nov 2014
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
pfsnyder3 is on a distinguished road
Re: Replacing exhaust elbow and plumbing on Universal M12

Could you post a photo of the triangular brace that you've used?
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 11-13-2014
Senior Member
 
Join Date: Oct 2011
Location: Naniamo B.C.
Posts: 2,276
Thanks: 2
Thanked 43 Times in 43 Posts
Rep Power: 4
Capt Len is on a distinguished road
Re: Replacing exhaust elbow and plumbing on Universal M12

If you use the galvi parts,just have really good air ventilation till the zinc burns off. Then lag with glass tape. I seal that with insingglass (a silica hydrate) but that is optional and really old school .Making up two units and keeping one as spare is good as I often weld flanges and don't need to set up twice.Welding apparently is fraught with danger and I agree the last thing you need is a pinhole weld and carbon monoxide .Thats why the thread plugging compound and real good gaskets are important.
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

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

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Exhaust Elbow PAULCR1 Atomic 4 5 09-03-2013 09:41 AM
Exhaust Elbow Lostmt Watkins 2 03-23-2013 08:19 PM
Exhaust elbow help needed SantaAna12 Diesel 14 08-06-2011 09:33 PM
2GM20F Exhaust Elbow thisisus Diesel 8 07-19-2009 06:34 PM
Universal 5411 exhaust elbow cooltec Gear & Maintenance 2 06-25-2007 06:20 PM


All times are GMT -4. The time now is 01:10 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, 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.