VALVE TRAIN - CAMSHAFT, TAPPETS & PUSH RODS - CONT

VALVE TRAIN - CAMSHAFT, TAPPETS & PUSH RODS - CONT - TM-5-3820-256-24-5_222

VALVE TRAIN - CAMSHAFT, TAPPETS & PUSH RODS - CONT - TM-5-3820-256-24-5_224

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 Design changes to improve initial lubrication to valve train components have been made by revising the rocker shafts and rocker arms on 400 Series engines. Rocker shafts were revised by drilling 3.1750 mm (.125 in.) diameter holes through the shaft while the rocker arm assembly oil hole was relocated to a vertical position. Figures 9 and 10 illustrate the displaced and new components. Engines built with and after the following serial numbers incorporate the new rocker arm and rocker arm shaft: Engine Serial Number D-312 8499 D/DT-360 13716 DT-414 103448 DT-414B 140000 D/DT-436 46359 DT-436B 100000 D/DT-466 21868 DT/DTI-466B 75000 DT/DTI-466C 400001 IMPORTANT 1. Displaced shafts must NOT be used with new rocker arms. 2. New shaft may be used with EITHER new or displaced rocker arms. Figure 9. - Rocker Arm Figure 10. - Rocker Arm ShaftCG-6459 CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 8

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