B3.9 and B5.9 Series Engines
Air Compressor Unloader and Valve Assembly (012-013)
Section 12 - Compressed Air System - Group 12
Use clean lubricating engine oil or Accrolube lubrication
TeflonTM grease, or equivalent, to lubricate the seal.
Liberally lubricate the unloader valve body bore and
unloader cap with high temperature grease (Accrolube lu-
brication TeflonTM grease, or equivalent).
Install the unloader cap.
Install the unloader spring.
Lubricate the unloader screw threads and underhead with
clean lubricating engine oil before installation.
NOTE: The two unloader body screws must not be used
to attach any brackets.
Assemble the unloader components, and attach the
unloader assembly to the valve plate with the four capscrews
NOTE: The longer capscrews are used to mount the mani-
fold to the air compressor.
Operate the engine, and check the air compressor for air