TM-9-2320-260-34-1

TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; VOLUME 1 OF 2

JULY 1994
TM-9-2320-260-34-1

  TM-9-2320-260-34-1 - Page 98 of 657

TM 9-2320-260-34-1
3-16. VALVE CROSSHEAD MAINTENANCE
THIS TASK COVERS:
a. Removal
c.
Installation and Adjustment
b. Inspection
INITIAL SETUP
APPLICABLE MODELS
All
MATERIALS/PARTS
Lubricating oil (Appendix C, Item 21)
TOOLS
REFERENCES (TM)
General mechanic’s tool kit
(Appendix B, Item 1)
TM 9-2320-260-10
TM 9-2320 -260-34P-1
Dial indicator (Appendix B, Item 11)
Inside micrometer (Appendix B, Item 9)
EQUIPMENT CONDITION
Outside micrometer (Appendix B, Item 8)
Parking brake set (TM 9-2320-260-10).
Torque wrench, 3/8-in. dr.
Rocker lever housing and push tubes removed
(Appendix B, Item 4)
(para. 3-15).
NOTE
All valve crossheads are maintained the same way. This procedure
covers one valve crosshead.
1.
Loosen adjusting nut (3) and turn adjusting screw (2) one turn counterclockwise.
2. Remove crosshead (1) from cylinder head guide (5).
1.
Inspect crosshead (1) for cracks, breaks, and scoring. Replace crosshead (1) if cracked, broken, or
scored.
2. Inspect adjusting screw (2) for damaged, distorted, and stripped threads. Replace adjusting screw (2)
if threads are damaged, distorted, or stripped.
3.
Inspect bore of crosshead (1) for wear. Replace crosshead (1) if bore exceeds 0.440 in. (11.18 mm) or
out-of-round.
4.
Inspect cylinder head guide (5) for cracks, breaks, and wear. Replace cylinder head wide (5) if
cracked, broken, or if diameter is worn smaller than 0.432 in. (10.97 mm).
1.
Coat crosshead (1) and cylinder head guide (5) with light film of lubricating oil.
2.
Install crosshead (1) on cylinder head guide (5) with adjusting screw (2) pointing toward exhaust
manifold side of engine.
3.
Hold crosshead (1) down so it contacts valve stem (6) on side opposite adjusting screw (2).
4.
Turn adjusting screw (2) until it contacts valve stem (4).
NOTE
Ensure adjusting screw is just lightly seated.
5. Place dial indicator over center of crosshead (1).
3-46


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