IBM Flex System x440 Compute Node Installation And Service Manual page 563

using a torque wrench, tighten the screws to 0.9 Newton-meters (Nm) to
1.13 Nm (8 inch-pounds to 10 inch-pounds).
What to do next
After you install a microprocessor and heat sink, complete the following steps:
1. Install the cover (see "Installing the compute node cover" on page 500).
2. Install the compute node in a IBM Flex System chassis (see "Installing a
compute node in a chassis" on page 490 for instructions).
Thermal grease
Use this information to determine the guidelines for using thermal grease on a
heat sink and microprocessor.
About this task
Note: This procedure should be performed only by trained service technicians.
The thermal grease must be replaced whenever the heat sink has been removed
from the top of the microprocessor and is going to be reused or when debris is
found in the grease.
To replace damaged or contaminated thermal grease on the microprocessor and
heat sink, complete the following steps:
Procedure
1. Place the heat-sink assembly on a clean work surface.
2. Remove the cleaning pad from its package and unfold it completely.
3. Use the cleaning pad to wipe the thermal grease from the bottom of the heat
sink.
Note: Make sure that all of the thermal grease is removed.
4. Use a clean area of the cleaning pad to wipe the thermal grease from the
microprocessor; then, dispose of the cleaning pad after all of the thermal grease
is removed.
Microprocessor
5. Use the thermal-grease syringe to place nine uniformly spaced dots of 0.02 mL
each on the top of the microprocessor.
0.02 mL of thermal
grease
Chapter 7. Installing, removing, and replacing compute node components
551