Willis WMI12MH16S Service Manual page 122

Steps
2 Twist off the tapping screws fixing the motor support,
pull it upwards and then remove the motor support.
9.Remove isolation sheet
Twist off the screws connecting isolation sheet and
end plate of condenser and chassis, and then remove
the isolation sheet.
10.Remove 4-way valve
Unsolder the pipe line between compressor,
condenser, gas and liquid valve, and then remove the
4-way valve. (note: release all refrigerant before
unsoldering).
Procedure
motor support
isolation sheet
4-way valve