12. Install a heat sink on the microprocessor:
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. If the thermal grease is contaminated, call
IBM service and support to request a replacement thermal grease kit. For
information about installing the replacement thermal grease, see “Thermal
grease” on page 83.
a. Remove the plastic protective cover from the bottom of the heat sink.
b. Align the screw holes on the heat sink with the holes on the system board;
then, place the heat sink on the microprocessor with the thermal-grease
side down.
c. Press firmly on the captive screws and tighten them with a screwdriver.
The follow illustration shows the sequence in tightening the screws, which
is also shown on top of the heat sink. Begin with the screw labeled as "1",
then "2", "3" and finally "4". If possible, each screw should be rotated two
full rotations at a time. Repeat until the screws are tight. Do not overtighten
the screws by using excessive force. If you are using a torque wrench,
tighten the screws to 8.5 Newton-meters (Nm) to 13 Nm (6.3 foot-pounds
to 9.6 foot-pounds).
Chapter 2. Installing optional devices 81
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