HP Z1 Entry Tower G5 Maintenance And Service Manual page 65

6. Each time the heat sink is removed, thoroughly clean the thermal grease from the bottom of the heat
sink (1) and apply fresh thermal grease to the top of the processor (2). Replacement thermal material is
included with the fan sink and system board spare part kits.
CAUTION: Fan sink retaining screws should be tightened in diagonally opposite pairs (as in an X) to evenly
seat the fan sink on the processor. This is especially important as the pins on the socket are very fragile and
any damage to them may require replacing the system board.
Fan sink 57