B3.9 and B5.9 Series Engines
Section 12 - Compressed Air System - Group 12
Remove the extension.
Install the intake valve spring with the tang down.
Install the intake valve.
Install the intake valve seat with the flange side up.
Install the unloader valve cap spring.
Install the unloader valve cap.
Use high-temperature grease (Accrolube lubrication Tef-
lonTM grease, or equivalent) to lubricate the outside diam-
eter of the cap.
NOTE: The rectangular ring seal must be installed with the
grooved side up.
Install the rectangular ring seal.
Install the o-ring seal.
Use clean engine oil to lubricate the o-ring seal.
Install the unloader valve body.
NOTE: Press the unloader valve body down to be sure the
tangs of the unloader valve cap are in the three slots of the
intake valve seat.
Do not overtighten. Failure to do so can cause com-
Hold the unloader body down and install the two plain
washers and captive washer capscrews.
Tighten the capscrews.