TM 5-3895-379-23
VALVE LASH (CLEARANCE) ADJUSTMENT
THIS WORK PACKAGE COVERS
Adjustment
INITIAL SETUP
References
Tools and Special Tools
TM 5-3895-379-23P, Figure 9
Tool kit, general mechanic's (Item 36, WP 0220 00)
Shop equipment, general purpose (Item 30, WP
Equipment Condition
Engine off (TM 5-3895-379-10)
Materials/Parts
Drums chocked (TM 5-3895-379-10)
Valve mechanism cover removed (WP 0016 00)
Rag, wiping (Item 31, WP 0219 00)
ADJUSTMENT
1.
Valve lash is measured between top of valve stem and rocker arm lever. With engine hot or cold, correct clearances
are 0.008 in (0.20 mm) for inlet valves and 0.018 in (0.45 mm) for exhaust valves.
NOTE
No. 1 cylinder is at front of engine. To set valve lash for respective cylinders, perform the following steps:
2.
No. 1 Cylinder: Rotate crankshaft in direction of engine rotation until inlet valve of No. 4 cylinder has just opened and
No. 4 exhaust valve has not completely closed. Check clearances of inlet and exhaust valve for No. 1 cylinder and adjust
as necessary.
3.
No. 3 Cylinder: Rotate crankshaft in direction of engine rotation until inlet valve of No. 2 cylinder has just opened and
No. 2 exhaust valve has not completely closed. Check clearances of inlet and exhaust valve for No. 3 cylinder and adjust
as necessary.
4.
No. 4 Cylinder: Rotate crankshaft in direction of engine rotation until inlet valve of No. 1 cylinder has just opened and
No. 1 exhaust valve has not completely closed. Check clearances of inlet and exhaust valve for No. 4 cylinder and adjust
as necessary.
5.
No. 2 Cylinder: Rotate crankshaft in direction of engine rotation until inlet valve of No. 3 cylinder has just opened and
No. 3 exhaust valve has not completely closed. Check clearances of inlet and exhaust valve for No. 2 cylinder and adjust
as necessary.
6.
Install valve mechanism cover (WP 0016).
7.
Start engine and check for proper operation (TM 5-3895-379-10).
END OF WORK PACKAGE
