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Heat on Cast Iron

B

Bob Landers

Member
I"ve just obtained a 1966 IH Cub Lo Boy that has serious rust problems. It"s obvious I"m going to have to use lots of heat to get rusted bolts out. I"m a little concerned about applying heat to cast iron.
I would appreciate it if someone would shed some light on this for me.
Thanks
 
Heating to 600 F shouldn't pose much problems such as risk of cracking. Higher than that, you should avoid heating the cast part locally and make sure it cools down slowly.
Reading in the web site (and the various links provided here and there)below will help you understanding what happens or can happen to cast upon heating.
HTH, Hendrik
Info on heating/cooling of cast
 
When using heat to loosen rusted bolts in a casting one usually heats the bolt, not the casting. Get the bolt head red hot quickly and then let it cool completely. This drives the water out of the rust reducing its volume. The expansion and shrinkage also causes a bit of motion of the bolt in the hole, helping to break it loose.

It isn"t practical to loosen bolts by heating the metal around them so that the hole swells more than the bolt does because the thermal contact between bolt and casting is so great and the thermal mass of the bolt so small that the bolt will never be significantly colder than the casting.
 
What are you heating up?

I don't have a big torch, but if I'm working in a moderate sized cast iron assembly, I set it on my gas grill, close the lid, turn on medium or high heat for an hour, turn off after a hour, then walk away from it till morning (lid closed).

Provided there's nothing affected by heat (springs, hardened steel, zinc, soldered parts, etc), this easy to disassemble after cool.

Pete
 
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