TYAN FT48T-B7105 Service Engineer's Manual page 41

3. Always start with CPU0 first. Remove the CPU Socket protection cap. Locate
the CPU socket's guide pin.
NOTE:
A new heatsink comes with pre-applied thermal grease.
Once the heatsink has been removed from the processor, you need to clean the
processor and heatsink using an alcohol solvent. Then apply new thermal grease
before reinstalling the heatsink.
4. Carefully flip the heatsink. Align the heatsink with the CPU socket by the guide
pin and make sure the guide pin is located in the correct direction. Then place the
heatsink onto the top of the CPU socket.
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