806D head studs

[MontanaRancher]

I am having a difficult time removing the exhaust manifold studs from the head so I can take it to the machine shop for new valves seats. Is it ok the heat the head to get the studs out or is that a bad idea? I do not want to break them off either. Any other suggestions? I have been using PB Blaster for 2 days and so far it has not helped.

 

[Dieseltech]

Why take them out? My head repair shop doesn't need them out.

 

[300guy]

You might try a product called Freeze Off by CCR. I first used it on a Genius plow clutch that was completely froze up and after letting it soak for a little while, each piece one at a time came apart without any heat or anything. I am a firm believer in this product and have used it a bunch over the past years to free studs, bolts in bushings, etc.

 

[rustred]

just leave them alone, unless u have extra money in you jeans. if they cant do the valve job with studs in the head something is wrong them. did they tell u to remove them?

 

[caterpillar guy]

Poor shop to need them out for valve work. Unless it has one already broke or they are corroded/rusted so bad they would not hold for another round on the manifold.

 

[BarnyardEngineering]

If you're going to heat anything, heat the stud, let it cool back down to no longer glowing, then try to remove.

If one is broke off, weld a nut to the stub, let it cool, and turn it out.

The premise of this is the bolt expands and "stretches" the cast around it slightly, breaking the rust bond...

 

[dhermesc]

As other have said heat the stud and remove. If you snap one off - have the machine shop take it out - usually very cheap without wasting your time or accidently ruining a hole. I am assuming you are putting new studs in - use a fair amount of anti seize when you do.

 

[MontanaRancher]

In all honesty I made an assumption based on my experience from ten years ago. This is not the same machine shop so I will ask before I go any further. THANKS FOR ALL OF THE REPLYS.

 

[SadFarmall]

In cases where I have needed to remove tight manifold studs from cylinder heads or head studs from a block I have used a roller type stud remover and freeze spray. You can freeze the stud to about -40 degrees and then just unscrew it. No risk of damaging the head or block with heat this way. Picture of stud remover attached.
SadFarmall