IBM System x3610 User Manual page 46

9. Install the air duct (see "Installing the air duct" on page 23).
If you have other optional devices to install or remove, do so now. Otherwise, go to
"Completing the installation" on page 39.
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IBM System x3610 Type 7942: User's Guide
Attention: Do not touch the thermal grease on the bottom of the heat sink or
set down the heat sink after you remove the plastic cover. Touching the thermal
grease will contaminate it.
a. Remove the plastic protective cover from the bottom of the heat sink.
b. Align the heat sink above the microprocessor with the thermal-grease side
down.
Heat-sink
Microprocessor
c. Press down firmly on the heat sink until it is seated securely.
d. Tighten the four screws that secure the heat sink to the system board.
Thermal grease
Heat-sink