Go Back   Ford F150 Forum - Community of Ford Truck Fans > Pre-1997 F150 > 1987 - 1996 F150
Sign in using an external account
Register Forgot Password?
Register Garage Photos FAQ Members List Social Groups Calendar Search Today's Posts Mark Forums Read StoreVendor Directory

Welcome to F150 Forum!
Welcome to F150 Forum,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 02-08-2012, 08:15 PM   #1
Senior Member
 
Join Date: Feb 2011
Location: Dayton Ohio
Posts: 287
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default Causes for cracked exhaust manifolds

The drivers side exhaust manifold on my 88 bronco is cracked it two places so what is causing them to crack,I am thinking I might drop the y pipe and knock out the convertors if plugged convertors are one of the causes of cracking. Either I was lucky but never had a exhaust manifold crack on me,this one was cracked when I got it.
Junkyardjeff is offline   Reply With Quote
Old 02-08-2012, 08:30 PM   #2
Springer Spaniels Rule
 
dirtcrew51m's Avatar
 
Join Date: Jun 2009
Location: Milltown, NJ
Posts: 3,446
Mentioned: 0 Post(s)
Thanks: 0
Thanked 14 Times in 13 Posts
Feedback Score: 0 reviews
Default

Loose or bad hangers, the manifold is supporting the ypipe which it should not be, causing it to crack, the ypipe needs to be supported so the manifold dont take the stress of the ypipe.
__________________
"Its a Ford. Nuff said. Everything else is just a glorified tonka toy"
"ASE" Certified" Parts Professional

92 F150 302 4x4 Long bed Extended cab
2001 Taurus wagon
dirtcrew51m is offline   Reply With Quote
Old 02-08-2012, 08:57 PM   #3
Mechanicalmike08
 
Mechanicalmike08's Avatar
 
Join Date: Apr 2009
Location: St Francis Wisconsin
Posts: 418
Mentioned: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Default

not to mention the cheap material there made from and the constant strain from heating and cooling of the material, along with the strain from the y pipe
Mechanicalmike08 is offline   Reply With Quote
Old 02-08-2012, 09:00 PM   #4
Springer Spaniels Rule
 
dirtcrew51m's Avatar
 
Join Date: Jun 2009
Location: Milltown, NJ
Posts: 3,446
Mentioned: 0 Post(s)
Thanks: 0
Thanked 14 Times in 13 Posts
Feedback Score: 0 reviews
Default

Thats why its important to support the ypipe.
__________________
"Its a Ford. Nuff said. Everything else is just a glorified tonka toy"
"ASE" Certified" Parts Professional

92 F150 302 4x4 Long bed Extended cab
2001 Taurus wagon
dirtcrew51m is offline   Reply With Quote
Old 02-08-2012, 09:08 PM   #5
Senior Member
 
Join Date: Feb 2011
Location: Dayton Ohio
Posts: 287
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default

It had no exhaust after the convertor and who knows for how long,I am about ready to put a muffler and tailpipe on it and did not want to hear a leak at the manifolds. Its cracked right here the pipe bolts on so the no support explains it,the reason I never had problems years ago is no weight from the convertors and I better check the pass side.

Last edited by Junkyardjeff; 02-08-2012 at 09:09 PM. Reason: added more words
Junkyardjeff is offline   Reply With Quote
Old 02-08-2012, 09:13 PM   #6
Springer Spaniels Rule
 
dirtcrew51m's Avatar
 
Join Date: Jun 2009
Location: Milltown, NJ
Posts: 3,446
Mentioned: 0 Post(s)
Thanks: 0
Thanked 14 Times in 13 Posts
Feedback Score: 0 reviews
Default

ebay has cheap manifolds, just make sure the ypipe is supported or the stress is taken off the manifold.
__________________
"Its a Ford. Nuff said. Everything else is just a glorified tonka toy"
"ASE" Certified" Parts Professional

92 F150 302 4x4 Long bed Extended cab
2001 Taurus wagon
dirtcrew51m is offline   Reply With Quote
Old 02-08-2012, 10:10 PM   #7
Senior Member
 
Join Date: Feb 2011
Location: Dayton Ohio
Posts: 287
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default

I had a good manifold in stock,it looks like its a 1980 casting number and is the same as the one I have that came from a mid 80s truck.
Junkyardjeff is offline   Reply With Quote
Old 02-08-2012, 10:10 PM
 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


 

The Mustang Source

All times are GMT -4. The time now is 02:15 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.5.2
Copyright 2006 - 20011 F150forum.com
This site is in no way affiliated with the Ford Motor Company.


Garage Plus vBulletin Plugins by Drive Thru Online, Inc.