Question on a new exhaust manifold

ed in cny

Member
Just a quick question. I have to replace the manifold on my 42 B and want to do this right. You know once and done. Anyways other than just mounting it on with the gasket is there anything else I should do to do this install proper? If not then I'll carefully mount it on and snug up the bolts (I have broken the ears off before on the outside ends of another B manifold).
 
Use new brass nuts so if you even need to take it apart again it will be easier to do then if you use steel nuts
 
Think I'll have issue getting the 76 year old nuts off? Should I be looking to replace the studs as well? Hadn't though of that nor the though they may be an issue.
 
Pour some ATF on them an do so for a few days if you need going to be doing it today. The ATF will help. And yes you do stand a 50/50 chance you will need new studs. BTDT and they strip or break all to often
 
Biggest messed up thing is the removal not the install. Do yourself a favor and do NOT twist the studs off with the nuts. If it makes you feel good spray your favorite pen oil on them. I skip that step and go right to the torch and heat the nuts red and get on them with a 6 point socket before they cool. Even if the threads or stud are junk it is LOTS easier to remove the stud when it isnt twisted off even with the head. Most of the time the threads will be OK to use but the stud will be rusted thin where it passes through the manifold or behind it.
 
I cut the nuts off without even trying to turn them. I have never twisted a stud off gripping it tight to the head to turn them out. I came about this way from the school of hard knocks. :)^D
 

I agree....I have 3 or 4 types of stud pullers but I find that a set of REAL Vice-Grips works best for me in this situation.
 
I'll add a +1 to that. I took it one step further, before I put the vice grips on, I threaded what was left of the stud and put two 3/8s nuts on it and jammed them. Then I was able to put the vice grips right up tight to the head on top, and a open end on the bottom and get a nice even pull without any tweaking and still have two hands of torque. Since this tractor ran so well, I didn't want to pull that head and do and end mill on it, so I was being careful. I don't show a photo when I put the vice grips on, but they were almost touching the head.

I have had to go through this a couple of times lately, the other head was also from a G-149, and it was so rusted that there were no nuts to break loose, just globs of rusted metal vaguely shaped like nuts. They had to be cut off first, then they got the same treatment.

After threading:

mvphoto18812.jpg


After it broke loose, always a hallelujah moment indeed with broken bolts:

mvphoto18813.jpg
 
Thank's guys for the help. I'm without a torch so heating it may be an issue if it comes to it. I'll have to see just how the old manifold nuts and studs have fared over the years. It would be nice to have this all work smoothly. But by what it sounds like I ought to get a set of studs in just in case before I tackle this job. The tractor isn't with me so I can't get a look now but I'll sure be looking things over when I do get a chance. Thanks again to everyone with their support.
 

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