B3.9 and B5.9 Series Engines
A/C Cylinder Head (QE Models) (012-104)
Section 12 - Compressed Air System - Group 12
Coolant is toxic. Keep away from pets and children. If
not reused, dispose of in accordance with local envi-
Do not remove the pressure cap from a hot engine. Wait
until the coolant temperature is below 50°C [122°F]
before removing the pressure cap. Heated coolant spray
or steam can cause personal injury.
NOTE: If the cylinder head is removed while the air com-
pressor is on the engine, drain the engine coolant. Refer
to Procedure 008-018.
NOTE: Since the valve plate, head, and unloader body are
indexible, marking these parts is recommended to make
sure they are reassembled in the proper orientation.
The unloader body is installed with spring tension. Use
care when removing to prevent personal injury. Always
wear protective eyewear.
Hold the unloader valve body down, and remove the four
Remove the unloader valve body.
Remove the unloader valve spring.
Remove the unloader valve cap.
Remove the unloader body gasket and unloader valve cap
rectangular ring seal.