B3.9 and B5.9 Series Engines
A/C Cylinder Head (QE Models) (012-104)
Section 12 - Compressed Air System - Group 12
Remove the remaining two pins and replace with two head
capscrews and washers, if initially installed.
Tighten all five capscrews in the proper sequence.
Install the new rectangular v-seal into the unloader body.
NOTE: The seal must be installed with the grooved side up.
Liberally lubricate the unloader valve bore above and be-
low the rectangular ring seal with high-temperature grease
(Accrolube lubrication TeflonTM grease or equivalent).
Install a new o-ring seal on the unloader valve body.