VALVE TRAIN - CAMSHAFT, TAPPETS & PUSH RODS - CONT

VALVE TRAIN - CAMSHAFT, TAPPETS & PUSH RODS

VALVE TRAIN - CAMSHAFT, TAPPETS & PUSH RODS - CONT - TM-5-3820-256-24-5_218

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 VALVE TRAIN - CAMSHAFT, TAPPETS & PUSH RODS Section 4 GENERAL With the crankcase front cover removed the gear train becomes visible. The camshaft gear (1, Fig. 2) has twice as many teeth as the crankshaft gear (2), as shown. Figure 2. - Gear Train 1. Camshaft Gear 2. Crankshaft Gear 3. Idler Gear Therefore, the camshaft rotates at one-half of the crankshaft speed due to the requirement to open and close the valves to each cylinder once for every two revolutions of the crankshaft. The camshaft bearings are pressure-lubricated and have holes drilled in them. When the bushings (2, Fig. 3) are installed, the oil holes must align with the ones drilled in the crankcase (1). The oil hole in the rear bearing permits lubricating oil to travel to the valve lever mechanism. Figure 3. - Camshaft Lubrication 1. Drilled Oil Hole in the Crankcase 2. Bushings CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 2

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