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

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

VALVE TRAIN - CAMSHAFT, TAPPETS & PUSH RODS

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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184

SERVICE MANUAL CYLINDER HEAD & VALVES Section 3 PROCEDURE Tighten cylinder head bolts following the assembly steps listed: 1. Lubricate bolt threads, bolt head seating areas and washers (where applicable) with clean engine oil. 2. Tighten bolts in three (3) stages: Stage 1 Following sequence "A" tighten bolts to 150 N-m (110 Ibf-ft). Stage 2 Following sequence "A" tighten bolts to 210 N-m (155 Ibf-ft). Stage 3 Following sequence "B" tighten bolts, in rows, to 225 N•m (165 Ibf-ft). NOTE: DO NOT back bolt off, "pull up" to torque level indicated. IMPORTANT: This procedure accommodates both old and new style cylinder head bolts. NOTE: Check the two end rocker arms for freedom of motion after torquing first stage. 8. Adjust valve lash following procedure described in this Section. 9. Adjust valve timing following procedure described in this Section. 10. Install valve cover as follows: a. Replace old packing rings with new under valve cover bolt washers to avoid oil leaks. b. Replace old valve cover gasket with a new gasket to assure an oil tight seal. c. Tighten the bolts to 3 N•m (26 Ibf-in.). 11. Install and connect leak lines to injection nozzle holders. 12. Using a new gasket, install and secure thermostat and thermostat housing to cylinder head. Secure hoses. 13. Using new gaskets install intake and exhaust manifolds as described in Section 2. 14. Reconnect fuel lines to injection nozzles and pump. Torque fittings to 47 N•m (35 Ibf-ft). 15. Fill cooling system to proper level (see Operator's Manual). 16. Operate engine under load for at least one hour, to bring it up to normal operating temperature (see ENGINE RUN IN SCHEDULE in Section 5). 17. After removal of cylinder head and replacement of a new cylinder head gasket, cylinder head bolts must be re-torqued and valve adjustments re-checked following the first hour of operation. (Refer to Fig. 41 for torquing sequence). IMPORTANT: "New Style" cylinder head bolts with flange heads must NOT be intermixed with "Old Style" bolts and hardened washers. "New Style" bolts DO NOT use washers. CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 35

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