Return to the home page...

Go Back   Moyer Marine Atomic 4 Community - Home of the Afourians > Introductions

Reply
 
Thread Tools Display Modes
  #1   IP: 71.7.132.214
Old 06-08-2021, 09:30 AM
VINCENTBR VINCENTBR is offline
Member
 
Join Date: Jun 2021
Posts: 4
Thanks: 2
Thanked 0 Times in 0 Posts
New Canadian Member

Hello Everyone!

I recently purchased a 1974 Alberg 30 in great condition. The Atomic 4 in the boat is the original engine and runs great. But have an issue lately where a hole has developed in the exaust manifold close to where the flange end. I removed it from the boat and patched the hole with JB weld. It worked for about two weeks and is now leaking exaust again. Does any one here know if maybe the manifold can be repaired by brazing or welding? The rest of the manifold looks to be in very good condition at least on the exterior. I would like to save the manifold if i can.

Any ideas and or advice will be greatly appreciated.

Thanks
Reply With Quote
  #2   IP: 40.140.239.18
Old 06-08-2021, 04:16 PM
Al Schober's Avatar
Al Schober Al Schober is offline
Afourian MVP
 
Join Date: Jul 2009
Location: Uncasville, CT
Posts: 2,002
Thanks: 16
Thanked 578 Times in 405 Posts
Most (suspect all) A4 engines are installed with the flywheel end high. The usual coolant piping also supplies water to the manifold - in at the high end, out at the low end. This is unfortunate as any air in the system gets trapped at the high end. Answer is to reverse the flow in the manifold - in at the low end, out at the high end.
Oh yeah, some of us also have the exhaust outlet at the high end!
Reply With Quote
The Following User Says Thank You to Al Schober For This Useful Post:
TimBSmith (06-08-2021)
  #3   IP: 71.7.132.214
Old 06-08-2021, 05:41 PM
VINCENTBR VINCENTBR is offline
Member
 
Join Date: Jun 2021
Posts: 4
Thanks: 2
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Al Schober View Post
Most (suspect all) A4 engines are installed with the flywheel end high. The usual coolant piping also supplies water to the manifold - in at the high end, out at the low end. This is unfortunate as any air in the system gets trapped at the high end. Answer is to reverse the flow in the manifold - in at the low end, out at the high end.
Oh yeah, some of us also have the exhaust outlet at the high end!
That makes sense to me , this forum is a great place!
Reply With Quote
  #4   IP: 152.160.191.221
Old 06-08-2021, 07:02 PM
marthur's Avatar
marthur marthur is offline
Afourian MVP
 
Join Date: Dec 2004
Location: Grand Rapids, Michigan
Posts: 831
Thanks: 25
Thanked 33 Times in 28 Posts
I see that you are looking for a manifold in another post. That is definitely the route I would take--I think the cast iron manifold would be difficult to repair. Don't be afraid to drop the money on a new casting from Moyer Marine, it would last many trouble free years.
__________________
Mike
Reply With Quote
  #5   IP: 47.142.129.155
Old 06-09-2021, 12:32 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
Do an advanced search (from the forum home page) by the term Thatch modification and read up on it. Mouse over the underlined term to see what the THATCH MODIFICATION is.

ex TRUE GRIT
Reply With Quote
  #6   IP: 100.36.65.17
Old 06-09-2021, 09:52 AM
edwardc's Avatar
edwardc edwardc is offline
Afourian MVP
 
Join Date: Aug 2009
Location: Laurel, MD
Posts: 2,509
Thanks: 153
Thanked 595 Times in 388 Posts
The manifold has some pretty thin interior walls on the cooling jacket. If it has rusted through on the outside, chances are that the interior parts are in bad shape too. A leak there can have much bigger consequences, such as introducing water/coolant into the cylinders and the oil.

Because of the high temperature swings, JB Weld is unlikely to hold up long, as it has a different thermal expansion coefficient than the manifold.

And, as was mentioned, cast iron is very difficult to weld properly without cracking as the weld cools.

All of this means that you really do need to replace the manifold with a new one. Do it right and cry once. The alternative is getting stranded somewhere, with the engine in worse shape than it is now.
__________________
@(^.^)@ Ed
1977 Pearson P-323 "Dolce Vita"
with rebuilt Atomic-4

Reply With Quote
The Following User Says Thank You to edwardc For This Useful Post:
Dave Neptune (06-09-2021)
  #7   IP: 142.169.78.155
Old 06-09-2021, 12:25 PM
VINCENTBR VINCENTBR is offline
Member
 
Join Date: Jun 2021
Posts: 4
Thanks: 2
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by edwardc View Post
The manifold has some pretty thin interior walls on the cooling jacket. If it has rusted through on the outside, chances are that the interior parts are in bad shape too. A leak there can have much bigger consequences, such as introducing water/coolant into the cylinders and the oil.

Because of the high temperature swings, JB Weld is unlikely to hold up long, as it has a different thermal expansion coefficient than the manifold.

And, as was mentioned, cast iron is very difficult to weld properly without cracking as the weld cools.

All of this means that you really do need to replace the manifold with a new one. Do it right and cry once. The alternative is getting stranded somewhere, with the engine in worse shape than it is now.
Hello
Yes, I have come to that conclusion after reading many posts here.

Thanks to all of you for the advice.
Reply With Quote
Reply

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
Canadian Construction Standards tac ABYC and USCG Standards 0 10-28-2017 09:08 AM
new member Shelby Introductions 10 07-20-2015 07:03 PM
Member to Member Emails Discontinued Administrator Announcements 2 04-07-2013 12:45 PM
Our 5,000th Member Administrator Announcements 14 03-25-2013 12:32 PM
New member bowser bill Introductions 1 12-28-2007 08:42 PM


All times are GMT -4. The time now is 09:09 AM.


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