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

CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5_209

CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5_211

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 ENGINE GEAR TRAIN TIMING Valve train failures from broken or bent push rods, valves, rocker arms and worn valve keepers and/or rotators in many instances have been found to be caused by improper timing of the gear train. Depending on valve lash setting, if the camshaft gear is improperly timed by one (1) tooth early, the engine pistons will strike the intake valve heads or if the timing is set one (1) tooth late, the exhaust valve may contact pistons. IN ALL CASES OF THE ABOVE, GEAR TRAIN TIMING CAN BE VERIFIED WITHOUT REMOVAL OF ENGINE FRONT COVER AND/OR TEAR DOWN. IMPORTANT: The revised intake ramp height of the new 400 Series Camshaft requires the engine gear train timing specification be increased from .60 mm (0.024 in.) to .74 mm (0.029 in). Two methods are available when checking engine gear train timing without removal of front cover and/or engine tear down. CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 30

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