A/C Cylinder Head (SS 191 Model) (012-101)
B3.9 and B5.9 Series Engines
Section 12 - Compressed Air System - Group 12
Do not use a scraper to remove carbon and scale. This
can damage sealing surfaces.
Use a stiff, nonmetallic bristle brush to scrub the parts.
Inspect for Reuse (012-101-007)
Inspect and replace if cracked, pitted, or grooved in excess
of 0.13 mm [0.005 in].
Inlet Valve Seat
Measure the distance from the valve seating surface to the
surface that contacts the valve cage.
Intake Valve Seat
Replace the intake valve seat if not within limits or if cracked
Inspect the seat for damage and wear.