TM 5-2420-230-24-2
A/C Cylinder Head (SS 191 Model) (012-101)
B3.9 and B5.9 Series Engines
Page 12-26
Section 12 - Compressed Air System - Group 12
CAUTION
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)
Valve Discs
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
mm
in
0.597
MIN
0.0235
0.673
MAX
0.0265
Replace the intake valve seat if not within limits or if cracked
or damaged.
Exhaust Valve Seat
Inspect the seat for damage and wear.
L-1230