CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5

CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5_212

CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5_214

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL CYLINDER HEAD & VALVES Section 3 CHECKING ENGINE GEAR TRAIN TIMING METHOD TWO USING A DIAL INDICATOR 1. Adjust the No. 1 intake valve with the No. 1 piston set at TDC (Top Dead Center) compression stroke as specified in Engine Gear Train Timing Specification Chart located under Method One. 2. Position the dial indicator fixture magnetic base on the valve cover fence rail with the indicator shaft on the No. 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: 300 Series Engines 4.5 mm to 6.0 mm (.180 in. to .240 in.) 400 Series Engines 3.9 to 5.5 mm (.155 to .220 in.) 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 as specified in Figure 39. IMPORTANT: Engine Gear Train Timing and Valve Lash Adjustment Procedure must be performed as described in this section. Following these procedures will assure proper valve and piston relationship and prevent pistons from striking valves. CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 33

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