manifolds

R

rusted

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I have the manifolds off my engine for a rebuild. Trying to get the two apart but the bolts are tight. I don't want to break them. What is the best way to get them out without destroying everything? Thanks for the help
 
I have tried soaking and heat. Generally, the bolts will shear off. It is a straightforward job to drill and tap the holes. Gar Williams
 
Go through the exhaust center port and heat the two bumps red hot, then try to remove the bolts. As Gar said, they often shear.
 
Hey, good news!! I went through the exhaust port, heated the bumps in there red hot and then tightened and loosened the bolts and they started to loosen. Working back and forth they finally came out. No problem. Thanks very much for the advise Tom. I knew you guys would come through for me!!
 
For the sake of others who might find this post later on while searching on the subject, in the event they do break off, it is not the end of the world. Usually there will be a small stub sticking up from the broken bolt. I find that placing a tightly fitting flat-washer over the top of that stud and thoroughly welding the washer to the stud (remains of the broken bolt) creates a foundation for a nut to be welded onto the top of the flat-washer. This gives a way to place a wrench onto the nut to twist out the remaining portion of the broken bolt. Maybe it also helps that the broken bolt has received a couple of heat cycles caused by the welding, and just a slight touch of heat through the inside of the manifold will generally let the broken bolt release.
 
If the nut and washer welding doesn't work (very rare) then if you wind up drilling and tapping the hole, be sure to not drill all the way through the bolt pockets.

Also be sure to use the copper high temp anti-seize on the new bolts.
 
I have repaired the bumps where they were drilled thru. Drilled and tapped for a coarse bolt, cut that plug flush, and drilled and tapped for the original size bolt. No irritating exhaust leak. Bob
 
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