Removal of heat sink?

[Glory_Cloud]

I need to take this big heat sink off of an IBM S/390 processor.
The heat gun I have doesn't seem to get the heat sink hot enough
to release it from the CPU like the others I have removed in the past.
Any ideas??

[hugo929]

i have also thia one with the heatsink. no idea how to removw it

[Vegeta]

John is an 80-th level heatsink-remover

[Guest]

I first used a dremel to remove the fins as they where radiating off the heat from my torch. Then I torched the remaining part of heatsink until it came off.

[CPUShack]

torch works fine, heat the heatsink a good amount, use the black connector to pry it off, it'll pop right off with no fuss

[aberco]

oh that's another nice MCM, how does it look like??!

[Glory_Cloud]

I won't know until I get the heat sink off.

[doccybrown]

Pull the unit, use a bench vise and
set the heatsink under stress -> force bending it!
When it bends one side of the heatsink will spread apart
from the MCM and you now can usually remove it
completely by hand with some force!
Wear eye glasses and gloves!
Hold the MCM with one hand in case it will be completely separated by
bending the heatsink so it will not fall to the ground and
split in several pieces
Hope for a picture of the MCM after successful work!

[Glory_Cloud]

Hmmm. I am a visual learner and that looks like a good idea!!

[frag_]

I used method similar to doccy's many times for glued heatsinks on 486/P1, always successfully!

[Guest]

Doccy also has some mad paintbrush skills...lol

[gekaufman]

Any tricks for getting the remaining epoxy off of a metal or ceramic top CPU?

[CPUShack]

depends on the type, soft pink stuff comes off with a blade + steel wool, the hard stuff brake cleaner will soften, then scrape off

[gekaufman]

Thanks!

[Glory_Cloud]

Getting closer to the reveal!!