IBM CS821 Service Manual page 72

Figure 63. Removing the processor air baffle
4. Loosen the load arm screw (A) of the system processor heat sink (B) that you are removing with a
#3 Phillips screw driver. The load arm pivots up in the direction that is shown in Figure 64.
Figure 64. Loosening heat sink load arm screw
5. Grip the heat sink and remove it by lifting straight up as shown in Figure 65 on page 57.
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Power Systems: Servicing the IBM Power System S821LC (8001-12C) or the IBM CS821 (8005-12N)