CRANKSHAFT, MAIN BEARINGS, FLYWHEEL & CRANKCASE - CONT

CRANKSHAFT, MAIN BEARINGS, FLYWHEEL & CRANKCASE - CONT - TM-5-3820-256-24-5_274

CRANKSHAFT, MAIN BEARINGS, FLYWHEEL & CRANKCASE - CONT - TM-5-3820-256-24-5_276

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 CRANKSHAFT, MAIN BEARINGS, FLYWHEEL & CRANKCASE Section 6 5. Inspect the 12 piston oil jet tubes used in Turbocharged Engines. Be sure they are open and clean as shown in Fig. 19. Figure 19. - Piston Oil Jet Tubes 1. Oil jets NOTE: DO NOT remove oil jets unless damaged. 6. If tubes are damaged replace as follows: a. Remove damaged tubes with a pilot driver (1, Fig. 20) as shown. b. Install new oil jet tubes with the same pilot driver shown in Fig. 20. c. The jet tube (when installed) must not project above the surface; but must be recessed 3 mm (1/8 inch) below the surface as shown in (2, Fig. 20). Figure 20. - Removing/Installing Piston Oil Jet Tubes 1. Pilot driver 2. Oil jet tube d. The top half of the main bearing insert (1, Fig. 21) is slotted to provide a flow of oil to the Jet tubes and camshaft bushings as shown. Figure 21. - Main Bearing Insert - Old Style Shown w/OFFSET Piston Oil Jet Tube Holes Figure 21A. - Main Bearing Insert - New Style w/Piston Oil Jet Tube Holes in Line 7. Repairs for coolant or oil leaks in crankcase casting can be performed in areas shown in Figure 21B only. Instructions are as follows: Restrictions: a. No repairs may be made within one inch of an internal rib, wall or boss casting. b. Casting cracks can not be repaired. c. Leak to be repaired must be within tap drill diameter. d. Maximum plug size allowed for repair is 1/4-18 NPTF. e. Leaks to be plugged (repaired) must be at least 3 inches apart. CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 16

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