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Valve lash adjustment
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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VIBRATION DAMPER MAINTENANCE
TM5-4210-229-14&P 6-6.  CYLINDER HEAD AND VALVES MAINTENACE (Continued). x.  Engine timing check (using a feeler gauge). (1) Adjust the number 1 intake valve with the number 1 piston set at top dead center com- pression stroke to 0.029 inch (0.74 mm). (2) Turn the engine forward to approximately bottom dead center. (3) Place a 0.004 inch (0.10 mm) feeler gauge between the valve lever and valve stem of the number 1 intake valve and slowly rotate the engine forward until the feeler gauge becomes tight.  This is now the point at which the number 1 intake valve starts to open before top dead center.  The degree readings should be 24°  ±  3°. NOTE One tooth out of time on gear train equals approximately 11 degrees movement of vibration damper. If the timing on the number 1 valve is within specifications, the other valves, barring ex- treme camshaft lobe wear or poor adjustment, will also be in time. (4) Readjust the number 1 intake valve to its proper lash as described in step w. (5) If timing is found to be incorrect, removal of the engine's front cover is required to in- spect punch mark and gear tooth position. y.  Engine timing check (using a dial indicator). (1) Adjust the number 1 intake valve with the number 1 piston set at top dead center com- pression stroke to 0.029 inch (0.74 mm). (2) Position the dial indicator fixture magnetic base on the valve cover fence rail with the indicator shaft on the number 1 intake valve rotator. (3) Set dial indicator at zero. (4) Rotate the engine approximately one full revolution either direction to a position of 360° from starting point. (5) Read the dial indicator.  The following readings indicate proper gear train timing: 0.155 to 0.220 inch (3.9 to 5.5 mm). (6) If dial indicator readings are outside the specified range, the engine's front cover must be removed and punch mark and gear tooth position adjusted. z.  Install valve cover (paragraph 4-90). aa.  Install injection nozzles (paragraph 4-77). bb.  Install engine (paragraph 5-1 1). 6-14

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