IBM System x3650 M4 BD Type 5466 Installation And Service Manual page 88

Figure 56. Heat-sink installation
Figure 57. Screws sequence
Results
If you have other devices to install or remove, do so now. Otherwise, go to
"Completing the installation" on page 79.
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System x3650 M4 BD Type 5466: Installation and Service Guide
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.
c. Place the heat sink on the microprocessor with the thermal-grease side
down.
d. 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).
Note: Please use Phillips screw driver No.0 to fasten screws.