I had the big luck to get two original sealed IBM MCM modules. I decided to demount one and I want
 to show you how I did this. I don't know exactly, but I think this TCM is a part of a IBM ES/9000 series
mainframe model 9274. It is very hard to get any information from IBM about these parts.

I was afraid to demount this great part because I have never done this before. I only knew that
many cores are under the heat sink. So I was very afraid to damage one of the silicon die cores.

 

TCM in original IBM box	IBM 98F2296, MFD 9621	I took a suitable board to start my project
removed the carrier	wow, so many pins. I hope to leave them straight!!	many screws to remove, I will remove them diagonally.
4 of them I screwed on the bottom to save the pins.	works great and no pins were bent.	all screws removed, the moment to remove the heat sink is here.
the TCM is stuck to the heat sink. I did not expect this!	after one hour I peeled the TCM off without damaging the ceramic	extremely sticky heat conducting paste!
I decided to take brake cleaner to remove the paste by washing.	works really great, and I did not have to contact the die cores.	ready.
The absolute highlight for my collection!! This is a monster-CPU and I really love it :-)

IBM TCM with handle and in protective carrier	IBM 21L2714, MFD 9935	wow, so many pins. I hope to leave them straight!!
removed the carrier	lets start	4 of them I screwed on the bottom to save the pins.
removing carefully all screws. note: always diagonal!	all screws removed, the moment to remove the heat sink is here.	the TCM is stuck to the heat sink. This time I did expect this!
around the MCM a metal belt with glue.	with a carpet knife I cut off the glue around the MCM	extremely sticky heat conducting paste!
I did also take brake cleaner to remove the paste by washing.	works really great, and I did not have to contact the die cores.	ready.
what a white beauty :-)