Return to the home page...

Go Back   Moyer Marine Atomic 4 Community - Home of the Afourians > Discussion Topics > Exhaust System

Reply
 
Thread Tools Display Modes
  #1   IP: 99.240.241.213
Old 09-14-2016, 08:54 AM
marginal's Avatar
marginal marginal is offline
Senior Member
 
Join Date: Sep 2013
Posts: 26
Thanks: 0
Thanked 2 Times in 1 Post
Assembling a black iron hot section

Hi everyone,
I'm assembling the parts to replace the hot section on my C&C30 A4, and have a couple of questions:

1. On the black iron nipples and elbows, do I put some type of sealant compound on the threads, or just dry fit them?

2. How do I make sure everything is facing the right way when it is tight? In other words, once tight enough, can I get another half to full turn on the threads to align things?

3. How tight is tight enough on 1.25" black iron?

So far things are going well, but surprisingly, the part I'm having the hardest time sourcing is the 1-5/8" pipe to go from the Moyer water mixer fitting to the water lift. If anyone has a tip for where to get that near Ottawa I'm all ears!

Thanks very much
Simon
__________________
Simon
1981 C&C 30 MK1 "Starlight" #657
Reply With Quote
  #2   IP: 137.200.32.54
Old 09-14-2016, 10:22 AM
joe_db's Avatar
joe_db joe_db is online now
Afourian MVP
 
Join Date: May 2009
Posts: 4,474
Thanks: 49
Thanked 1,026 Times in 721 Posts
I just tighten mine as much as I can, no sealant. Any NPT pipe assembly has the issue of too loose at the desired position plus not able to get one more full turn. I use pipe wrenches and crank the crap out if it sometimes, YMMV. McMaster has all kinds of pipe if you can't find it locally. I made my own water injection fitting and did it all with 1.25"
Reply With Quote
  #3   IP: 161.213.49.150
Old 09-14-2016, 11:06 AM
JOHN COOKSON JOHN COOKSON is offline
Afourian MVP, Professor Emeritus
 
Join Date: Nov 2008
Posts: 3,500
Thanks: 54
Thanked 855 Times in 629 Posts
Quote:
Originally Posted by marginal View Post
Hi everyone,
1. On the black iron nipples and elbows, do I put some type of sealant compound on the threads, or just dry fit them?
2. How do I make sure everything is facing the right way when it is tight? In other words, once tight enough, can I get another half to full turn on the threads to align things?
3. How tight is tight enough on 1.25" black iron?
So far things are going well, but surprisingly, the part I'm having the hardest time sourcing is the 1-5/8" pipe to go from the Moyer water mixer fitting to the water lift. If anyone has a tip for where to get that near Ottawa I'm all ears!
Simon
1.No sealant is necessary. Just tighten 'em down. Tight.
2. Getting all the pieces lined up is a bit of a trick if you never have replaced a hot section on a C&C 30 before. When I replaced the hot section on my Catalina 27 I lined the pieces up as good as I could, secured the new hot section in place to check, then removed it and made adjustments as necessary. I have a union just after the flange which made it easy to place and remove the new hot section and do the adjustments. I don't have access to get the wrenches near the engine on my boat so I needed to make the adjustments in the cockpit. It was labor intensive.
If you have access on your boat to get the wrenches around the engine area just start building the new hot from the manifold back.
3. See #1

TRUE GRIT

Last edited by JOHN COOKSON; 09-14-2016 at 05:34 PM.
Reply With Quote
  #4   IP: 137.200.32.54
Old 09-14-2016, 11:16 AM
joe_db's Avatar
joe_db joe_db is online now
Afourian MVP
 
Join Date: May 2009
Posts: 4,474
Thanks: 49
Thanked 1,026 Times in 721 Posts
If you just can't get it tight you can always weld all the junctions. I did this once, but last time saved the $$$ and just cranked it.
Reply With Quote
  #5   IP: 76.179.157.47
Old 09-14-2016, 01:09 PM
BunnyPlanet169's Avatar
BunnyPlanet169 BunnyPlanet169 is offline
Afourian MVP, Professor Emeritus
 
Join Date: May 2010
Location: York, ME
Posts: 952
Thanks: 25
Thanked 94 Times in 67 Posts
If you're going to McMasterCarr (or a good plumbing supply store), pay the up charge and go with schedule 80. The thicker wall will last longer, especially at the threads.
__________________
Jeff


S/V Bunny Planet
1971 Bristol 29 #169
Reply With Quote
  #6   IP: 205.178.86.40
Old 09-14-2016, 02:55 PM
Antibes's Avatar
Antibes Antibes is offline
Senior Member
 
Join Date: Jun 2011
Location: Chicago, IL
Posts: 120
Thanks: 8
Thanked 26 Times in 22 Posts
The black pipe threads basically corrode themselves shut very quickly, why sealant is unnecessary.
Reply With Quote
The Following 2 Users Say Thank You to Antibes For This Useful Post:
Dave Neptune (09-14-2016), sastanley (09-14-2016)
  #7   IP: 24.53.90.221
Old 09-14-2016, 04:10 PM
Peter's Avatar
Peter Peter is offline
Afourian MVP
 
Join Date: Jul 2016
Location: Nova Scotia, Canada
Posts: 297
Thanks: 162
Thanked 140 Times in 101 Posts
i recently re-did my hot section and there were really only one or two spots where getting the angles correct were critical. For the others I tightened the hell out of them.

One of the tricky ones was the section going from the engine to a 90 degree elbow and then out of the engine compartment. The PO had done this with two nipples and a coupler from the exhaust flange to the elbow instead of a single nipple. This put four threads in the section instead of two. I repeated this because I felt it would give me more play to get that final turn. Seemed to work out nicely.

Wrap - tried a cheap "titanium" - smoked, stank like hell, and was getting "crispy" - I think it was some curing process. Go for the good stuff. MMI has it and it is also readily available at performance car shops and bike shops.

Threads - from Don Moyer - " I replaced the hot section on each of our three sail boats over the past years and all I ever used was Never-Seize simply as a lubricant to be sure the tapered pipe threaded fittings were tight, and I never had any leakage. Having said that, I do hear of a heat resistant dope that some folks have been using, but I can't recall the brand or where they got it."

Needless to say, I used Never-Seize on my threads

Peter
Reply With Quote
  #8   IP: 165.225.36.60
Old 09-14-2016, 04:32 PM
marginal's Avatar
marginal marginal is offline
Senior Member
 
Join Date: Sep 2013
Posts: 26
Thanks: 0
Thanked 2 Times in 1 Post
Thanks for the help everyone!
Simon
__________________
Simon
1981 C&C 30 MK1 "Starlight" #657
Reply With Quote
  #9   IP: 174.138.193.154
Old 09-17-2016, 01:02 PM
Bruce Macdonald Bruce Macdonald is offline
Member
 
Join Date: Nov 2006
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Simon
Fellow NSC member, just replaced all the black pipe exhaust system, all piping was purchased from Boone Plumbing.
Reply With Quote
  #10   IP: 99.240.241.213
Old 09-17-2016, 06:03 PM
marginal's Avatar
marginal marginal is offline
Senior Member
 
Join Date: Sep 2013
Posts: 26
Thanks: 0
Thanked 2 Times in 1 Post
Thanks Bruce. I got all the pipe at Boone as well, the mixer and flange from Moyer, and the 1-5/8 exhaust hose ordered in by The Chandlery.

It all went together today fairly easily and I'm back in action

Simon
__________________
Simon
1981 C&C 30 MK1 "Starlight" #657
Reply With Quote
  #11   IP: 71.178.80.41
Old 09-17-2016, 08:09 PM
sastanley's Avatar
sastanley sastanley is online now
Afourian MVP
 
Join Date: Sep 2008
Location: Solomons, MD
Posts: 7,016
Thanks: 1,134
Thanked 600 Times in 442 Posts
Simon, thanks for the update!
__________________
-Shawn
"Holiday" - '89 Alura 35 #109
"Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!)
http://www.moyermarine.com/forums/signaturepics/sigpic3231_6.gif
Reply With Quote
Reply

Tags
black iron, exhaust, sealant

Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Black iron source for exhaust sailhog Exhaust System 28 02-19-2016 02:36 PM
black iron pipe Hymodyne General Interest 18 04-24-2013 10:40 PM
welding black iron pipe Hymodyne General Interest 13 03-25-2013 12:34 AM
Black iron or Stainless or brass for exhaust?? romantic comedy Exhaust System 13 02-13-2012 04:34 PM
Where did you get 1-1/4" black iron pipe and fittings? ILikeRust Exhaust System 11 10-03-2011 08:26 AM


All times are GMT -4. The time now is 07:10 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.


Universal® is a registered trademark of Westerbeke Corporation

Copyright © 2004-2024 Moyer Marine Inc.

All Rights Reserved