TM  10-3930-643-34 ENGINE,  FUEL,  EXHAUST  AND 4-6. Rocker  Arm  Assembly ADJUSTMENT COOLING   TROUBLESHOOTING and Valve Cover. (Sheet Do not adjust valves with engine running. Severe damage can result from  inserting  feeler  gage  between valve and rocker arm because of limited  clearance. NOTE All valves are adjusted by crank- ing the engine twice. Perform valve  lash  adjustment with the engine  at  any  temperature above freezing. 27. Turn crankshaft on bottom, front of engine  until  exhaust  valve  closes  on No. 1 cylinder. Continue turning until TDC mark (pin) on vibration damper is in line with timing pointer on front cover. No. 1 piston will be on compression stroke. VALVE  LASH  ADJUSTMENT  CHART ENGINE INTAKE EXHAUST ENGINE Serial  No. In. In. DT 466B 110913 and below 0.020 0.025 DT-466B 110914 and above 0.025 0.025 AND  MAINTENANCE.  (cont) 8 of 9) Go to sheet 9 4-58