TM  10-3930-638-24&P 3-5. ENGINE MAINTENANCE (cont) a. Engine Tune-up (cont). (2)  Valve  Tappet  Clearance  Adjustment  (cont). STEP LOCATION ITEM ACTION REMARKS TAPPET ADJUSTMENT — COLD SETTING (cont) 1 f.  Oil  pressure Check Start engine and check OIL PRESSURE (cont) gage for normal indication. Visually check rocker arms to insure that they are receiving oil, then stop engine g. Valve tappet clearance- Adjust Proceed to step 2 below hot  setting TAPPET ADJUSTMENT — HOT SETTING 2 a. Rocker arm cover Install Para  3-5i b. Engine Warm-up Start engine and operate (under load if possible) approximately one hour; then stop  engine c. Rocker arm cover Remove Para 3-5i NOTE Engine must beat normal operating temperature for each of the following steps. If necessary, restart and run engine to maintain normal operating temperature. d. Cylinder head nuts Retorque Loosen bolt shown in position 1 approxi- and bolts mately 1/4 turn, then tighten to 110-115 pounds foot torque. Using same procedure, retorque each cylinder head nut and bolt in sequence shown NOTE Use extension wrench to torque nuts in positions 4 and 5. e.  Reeker  arm  bracket Retorque Para  3-5j bolts f. Reeker arm adjusting Adjust Repeat step 1 with engine at normal screws operating  temperature g. Rocker arm cover Install Para 3-5i 3-31