Originally Posted by cadillackid
whenever I take exhaust manifold bolts loose i tend to use heat or impact if you can either use an impact gun or tap on the wrench wit ha couple pound hammer..
Heat is a little risky if you have aluminum heads.. if your heads are iron the likelihood of bolt breakage is a bit less.. at least from my experience.. patience is a must if using heat...
ive not use heat and impact.. ive always felt that the heated metal would be weak enough that impact might break it.. others who have removed pesky exhaust bolts can chime in.. its a bit of an art... ive had pretty good success at not busting them over the years..
Need some gloves for this. And you have to be prepped and ready.
It's easier to drill hot steel than cold steel.
Exhaust manifold bolts?
EZ out kit.
Drill the hole in the broken bolt while the engine is warming up (before,after,during doesn't really matter) as long as the proper size drill bit is used for the bolt and easy out.
Now think of expansion and contraction?
Metal expands when hot and contracts when cool.
You have a hole drilled in your broken stud and you have the EZ out stud remover.
Now you take a can of? Lot of options? But the most available outside of the mechanicking world is the stuff they sell as keyboard cleaner and there is a better ones made specifically for this but auto parts stores in my area don't sell them.
The idea is and does work.
The engine and everything connected to it is hot and you inject cold into the bolt you need to extract it will contract.
But like I said. You need to be ready because the heat is going to overcome your cooling pretty quick but you can pull the extractor out and cool the bolt again as needed.
There was another thread last night that I was typing this for and ran out of computer battery and am to tech. Challenged to get it back to there but this one brought up broken manifold studs? So this is where it landed?
Hope it helps someone?