VALVE ADJUSTMENT

TM 5-2420-224-20-2 VALVE ADJUSTMENT This task covers: Adjustment Tools and Special Equipment: Equipment Condition: TooI Kit, SC 5180-90-CL-N26 Reference Condition Description Page 4-3 Valve Cover Removed 1. Rotate crankshaft to right until rocker arms of No. 6 cylinder overlap. No. 1 cylinder will now be at Top Dead Center (TDC). C A U T I O N Do not make valve adjustments u n t i l e n g i n e h a s c o o l e d t o below 122° F (50° C) to prevent damage to equipment. 2. Using feeler gage, check valve clearance. Clearance for intake valves 2, 3, and 7 is 0.008 in. (0.20 mm). Clearance for exhaust valves 1, 5, and 9 is 0.012 in. (0.30 mm). 3. If adjustment is required, loosen nut (1) and insert feeler gage between rocker arm (2) and pad (3). Turn adjusting screw (4) until rocker arm just touches feeler gage. Tighten nut (1) and recheck clearance. 4. Rotate crankshaft to right until rocker arms of No. 1 cylinder overlap. No. 6 cylinder will now be at TDC. 5. Repeat steps 2 and 3 for intake valves 6, 10, and 11 and exhaust valves 4, 8, and 12. NOTE Follow-on Maintenance: Install valve cover (page 4-3). 4-5