TM 5-2420-230-24-2
A/C Cylinder Head (SS 191 Model) (012-101)
B3.9 and B5.9 Series Engines
Page 12-24
Section 12 - Compressed Air System - Group 12
Remove and discard the o-ring (3) from the unloader pin
(4).
9/16 Inch
Remove the four cylinder head capscrews (6).
Remove the cylinder head (7).
Remove and discard the cylinder head gasket (8).
Service Tip: Scribe a mark to show proper head orienta-
tion before removing the head.
Air Compressor Seat Socket or 3/4-Inch Allen Wrench,
Part No. 3823528
Install the head with the bottom side up in a soft-jawed vise.
Remove the exhaust valve seat (9).
Remove the following parts:
Exhaust valve disc (10)
Spring (11)
Copper washer (2).
Discard the copper washer.
NOTE: The exhaust valve stop is pressed in place and
must not be removed.
L-1228