4.10.23 Valve Clearance Adjustment.
This task covers:
Valve Clearance Adjustment
General Mechanics Tool Kit (appendix B,
Section III, Item 1)
Washers (TM 10-4320-226-24P)
Gaskets (TM 10-4320-226-24P)
Sealant Adhesive (appendix E, Section II,
Equipment shut down, refer to
paragraph 220.127.116.11 or 18.104.22.168.
V-belt guard removed,
General Safety Instructions
To prevent rolling or sliding, do not
work on equipment that is not
Do not work on equipment without
following standard shop safety
To prevent rolling or sliding, do not work on equipment that is not
Ensure both wheels are secure.
Failure to obey this
warning may result in serious personal injury.
Remove bolts (figure 4-33, 1), washers (2), covers (3), and gaskets (4).
Turn crankshaft (5) in direction of rotation until valves of number 1
cylinder (6) overlap (pushrods move freely).
Adjust cylinder number 2 intake valve (7) and cylinder number 3 exhaust
valve (8) as follows:
(1) Loosen slotted adjusting screw locknut (9).
(2) Adjust rocker arm/valve stem clearance to 0.006 in (015mm) by turning
slotted adjusting screw.
(3) While holding slotted adjusting screw, tighten locknut (9).
(4) Recheck clearance and readjust if necessary.
Rotate crankshaft one complete revolution (360°).
Adjust remaining valves as in step c.
Apply adhesive sealant to new gaskets (4) and place into position on
Install covers (3), washers (2), and bolts (1).