Go Back  Offshoreonly.com > Technical > General Q & A
Pressure test exhaust manifolds? >

Pressure test exhaust manifolds?

Notices

Pressure test exhaust manifolds?

Old 05-07-2006, 04:38 PM
  #1  
Registered
Thread Starter
 
Join Date: Oct 2005
Location: Ankeny IA
Posts: 314
Likes: 0
Received 0 Likes on 0 Posts
Default Pressure test exhaust manifolds?

Will hooking up a garden hose to exhaust manifolds give enough pressure to expose leaks? I have done this, but it did not leak. I have 3 cylinders on one bank looking brand new (never fired) on my new motor. I find it really hard to believe an intake or head problem would cause three cylinders not to fire.

The motor seemed to idle fine, but under any throttle cylinders would go dead. My guess is cylinders were swimming.
jmherbert is offline  
Old 05-07-2006, 07:27 PM
  #2  
Registered
iTrader: (1)
 
Join Date: Jun 2004
Location: Omaha, Nebraska. Boat on the Mighty Mo! Longest river in the USA!
Posts: 1,944
Received 37 Likes on 23 Posts
Default Re: Pressure test exhaust manifolds?

Why "guess" is there water in the cylinders or not? If there is a lot of water it will not run period. I have tried the water on a hose and it did not work for me. My problem was when it heated up it leaked from the riser gasket into the manifold. At high RPMS it would not bother it. IT loaded up at idle.
1BIGJIM is offline  
Old 05-07-2006, 07:55 PM
  #3  
Charter Member #927
Charter Member
 
Payton's Avatar
 
Join Date: Jan 2001
Location: IN
Posts: 4,834
Received 2 Likes on 2 Posts
Default Re: Pressure test exhaust manifolds?

I would think a water hose will find the leak. You have 50-60 psi on a lot of water hoses. 15-20 with a max of 30 psi in the boat.
Payton is offline  
Old 05-07-2006, 08:05 PM
  #4  
Registered
Thread Starter
 
Join Date: Oct 2005
Location: Ankeny IA
Posts: 314
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Pressure test exhaust manifolds?

I forgot to mention, everything on the motor except the manifolds/risers is new, and intake and head gaskets looked kosher.

I think your right, its the gasket leaking when at temperature. Hard to tell that when you use a garden hose.

I've decided to get aftermarket exhaust, one without that infernal wet joint.

I just would like to find the actual cause of my problems

Last edited by jmherbert; 05-07-2006 at 11:40 PM.
jmherbert is offline  
Old 05-08-2006, 04:25 PM
  #5  
Registered
 
Ateco's Avatar
 
Join Date: Apr 2006
Location: Ingleside, IL
Posts: 232
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Pressure test exhaust manifolds?

CMI uses external jumpers and avoids the internal joint all together!! Unitop or Etops would work great for your application.

See:

www.custommarine.com

Please contact us for your CMI Exhaust needs.

www.atecoengines.com
Ateco is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
acaruso
Do It Yourself, Boating on a Budget
3
10-28-2008 12:36 PM
dennyp123
General Q & A
1
01-17-2007 06:49 AM
Audiofn
General Q & A
4
11-22-2004 10:11 PM
faceoff
General Q & A
2
01-05-2004 08:44 PM

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 On
Pingbacks are On
Refbacks are On


Quick Reply: Pressure test exhaust manifolds?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.