Lenovo ThinkSystem SD650 V3 User Manual page 182

Figure 180. Processor unlocked position
Step 6. Check the gap pads on the water loop, if any of them are damaged or missing, replace them with
the new ones.
Figure 181. Water loop gap pads
Make sure to follow Gap pad/putty pad replacement
Step 7. Carefully rotate the top side of the water loop, position the water loop on the two guide pins near
the rear of the node; then, gently put the water loop down and ensure it is firmly seated on the
system board.
ThinkSystem SD650 V3 Neptune DWC Tray User Guide
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guidelines.