Dell EMC PowerEdge XR11 Installation And Service Manual page 66

Figure 57. Installing the processor and heat sink (PHM)
3. Set the anti-tilt wires to the locked position (outward position), and then using the Torx T30 tool, tighten the captive nuts (8
in-lbf) on the heat sink in the order below:
a. Tighten the first nut completely.
b. Tighten the nut diagonally opposite to the nut you tighten first.
c. Repeat the procedure for the remaining two nuts.
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