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Valve seat inserts installation
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Engine timing check (using a feeler gauge)
TM5-4210-229-14&P 6-6.  CYLINDER HEAD AND VALVES MAINTENANCE (Continued). u.  Lubricate bolt threads, bolt head seating areas and washers with clean lubricating oil (Appen- dix D, Item 36). v.  Torque bolts in three stages: Stage 1: Following sequence "A" torque bolts to 110 ft-lb (150 N.m). Stage 2: Following sequence "A" torque bolts to 155 ft-lb (210 N.m). Stage 3: Following sequence "B" torque bolts in rows, 165 ft-lb (225 N.m). CAUTION Do not back bolt off, pull up to torque level indicated.  Check the two end rocker arms for freedom of motion after torquing first stage. Do not adjust valves with the engine running.  Severe damage can result from inserting feeler gauge between valve and valve lever due to close clearance of valve piston. w.  Valve lash adjustment. NOTE Valve lash may be adjusted as a separate operation without cylinder head and valve lever removal, disassembly, cleaning, inspec- tion or repair. All valves are adjusted by cranking the engine only twice. Perform valve lash adjustment with the engine warm which means any temperature above freezing. (1) Turn the crankshaft until the number one piston is on the compression stroke and the timing pointer on the front cover is in line with the top dead center mark (pin) on vib- ration damper or flywheel. NOTE Be sure that the number one piston is on the compression stroke by turning both push rods by hand to determine that both valves are closed.  Valves are closed when push rods are loose and can be turned easily. (2) Six valves are adjusted when the number 1 piston is at top dead center (compression) and the remaining six are adjusted when the number 6 piston is at top dead center (com- pression).  Odd numbered valves are intake valves; and even numbered valves are ex- haust valves. (3) Valve tappet clearance (lash) is 0.025 inch (0.64 mm) for intake valves and exhaust valves. CAUTION When tightening head bolts, place a 0.005 inch (0.127 mm) feeler gauge between the outside brackets and the rocker levers to prevent binding. 6-13

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