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cracked exhaust manifold

  #1  
Old 12-26-2012, 10:54 PM
garmar60
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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
 
  #2  
Old 12-28-2012, 12:48 AM
IndyDragon
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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.
 
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