cracked exhaust manifold - Ford Truck Enthusiasts Forums



cracked exhaust manifold

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 12-26-2012, 10:54 PM
garmar60 garmar60 is offline
New User
Thread Starter
 
Join Date: Oct 2005
Posts: 14
garmar60 is starting off with a positive reputation.
cracked exhaust manifold

need some help from the experts, We just installed a reuild long bolck in a 06 f150. its the 5.4L. used new exhaust manifold hardware and gaskets, torqued the studs and nuts per the specs. runs good, no codes but we have a slight surge, about 25-30 rpm, most noticeable at about 1700 rpm. with the code scancer in it we see a variation in the rpm, the short term fuel trim and the o2 sensor values. we noticed a crack in the right side exhaust manifold, near the rear, on the top. would this cause the surge problem. how can this be fixed. i have a mig welded but dont think it will work on cast. can it be brazed or is there some other way to fix.
We are open to any ideas.
thansk
gary
Reply With Quote
  #2  
Old 12-28-2012, 12:48 AM
IndyDragon IndyDragon is offline
Freshman User
 
Join Date: Nov 2012
Posts: 32
IndyDragon is starting off with a positive reputation.
The only way to weld cast and get a really good bond is to stick weld it with nickel rod. You need to clean the area to be welded thoroughly first and pre heat it with a torch so that you get a good solid weld.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
'92 5.8 idle surging, hard start when cold, rpm surging when warm Flatbed 1987 - 1996 F150 & Larger F-Series Trucks 4 02-02-2015 06:07 PM
Turbo Surge Re-do psdendurance 6.0L Power Stroke Diesel 9 04-01-2009 08:20 PM
exhaust manifold on 351w to 302?? 00bucker Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) 7 03-04-2007 06:56 PM
I6 Exhaust Leak ftcav 1987 - 1996 F150 & Larger F-Series Trucks 1 03-03-2007 12:42 AM
an Idea on thes Cracked Exhaust manifolds Thudpucker Ford Inline Six, 200, 250, 4.9L / 300 3 12-09-2004 10:51 PM


Go Back   Ford Truck Enthusiasts Forums >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Forum Jump


All times are GMT -5. The time now is 06:41 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.