TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
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TM 9-2815-220-24 ROCKER ARM ASSEMBLY AND COVER REPLACEMENT 0104 00 REMOVAL (Continued) CAUTION Do not remove the last four screws (primary fasteners) until valve spring pressure has been relieved. Valve spring pressure must be relieved at each cylinder as the rocker arm cover for that cylinder is removed. Failure to comply may damage cylinder threads that retain rocker arm cover. 8. Release valve spring (22) tension. a. Release the tension on valve rocker arms (23) and valve springs (22) by rotating engine crankshaft until rocker arm rollers (24) are on camshaft base circle (valves are closed). b. Check rocker arms (23) for free movement between adjusting screw pads (25) and valve stems (26) on both exhaust and intake valves. If movement (clearance) cannot be felt, rotate engine crankshaft until clearance is evident. c. When clearance is obtained between adjusting screw pads (25) and valve stems (26), rocker arm rollers (24) are on camshaft base circle, and valve spring tension is relieved. 24 26 25 23 22 WP 0104 00-8