INSPECTION - TM-5-2410-237-230257

TM 5-2410-237-23

VALVE MECHANISM MAINTENANCE - CONTINUED

0019 00

CLEANING

WARNING

Solvent cleaning compound MIL-PRF-680 Type III is an environmentally compliant and low toxic mate-

rial. However, it may be irritating to the eyes and skin. Use protective gloves and goggles. Use in well-venti-

lated areas. Keep away from open flames and other sources of ignition.

Thoroughly clean all parts in solvent cleaning compound and dry with low pressure air.

INSPECTION

NOTE

Refer to WP 0241 00 for general inspection instructions.

Inspect rocker shaft washers for distortion or other damage, and replace if necessary.

Inspect brackets for excessive wear, cracks or other damage, and replace if necessary.

Inspect rocker shaft springs for distortion, excessive wear, or other damage. Replace a damaged rocker shaft spring.

Inspect dowel pins for defects. Replace a bent or out-

of-round pin.

Inspect rocker arms for any signs of excessive wear or

other damage. Refer to Table 1 for rocker arm wear

limits and specifications. If measurements are not

within the specified limits, or if a rocker arm is dam-

aged in any way, replace rocker arm.

387-158

Table 1. Rocker Arm Wear Limits and Specifications.

Bore (Dimension "A") in Bearing for Shaft (New) . . . . . . . . . . . . . .0.7263 +/- 0.0005 in. (18.448 +/- 0.013 mm)

Diameter of Shaft (New) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7245 +/- 0.0005 in. (18.402 +/- 0.013 mm)

Maximum Permissible Clearance Between Bearing and Shaft (Worn) . . . . . . . . . . . . 0.008 in. (0.20 mm x 0.008)

Torque for Nut (1) on Valve Adjustment Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 +/- 5 lb-ft (29 +/- 7 Nm)

Clearance (Dimension "B") for Valves:

Intake Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.015 in. (0.38 mm)

Exhaust Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025 in. (0.64 mm)

0019 00-3