Section VII. CYLINDER HEAD AND VALVE OPERATING MECHANISM

Figure 13-37. Timing Gear, Exploded View

Figure 13-38. Rocker Arm Shaft and Rocker Arm Assembly, Exploded View

TM-5-6115-593-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 600 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 0.41 mm); check clearance with feeler gauge. (7) Install guide studs in engine block. (8) Install new gasket (28, figure 13-36). (9) Secure gear cover with capscrews (27), lockwashers (21) and screws (20). Section VII. CYLINDER HEAD AND VALVE OPERATING MECHANISM 13-24. GENERAL. The following paragraphs contain maintenance instructions for components comprising the cylinder head. 13-25. ROCKER ARM SHAFT AND ROCKER ARM ASSEMBLY. To service the rocker arm shaft and rocker arm assembly, refer to figure 13-38 and proceed as specified in the following paragraphs: a. Removal. Proceed as follows: (1) Refer to the Operator/Crew and Organizational Maintenance manual for inspection and cylinder head cover removal instructions. (2) Remove pipe plug (12). (3) Remove pipe plug (13) from end of rocker lever housing (8), and set screw in bottom of housing that secures shaft. (4) Use a flat or drift punch to force out shaft (14) and cup plug (11). (5) Locate shaft in V-block and remove shaft plug (15). (6) Remove rocker levers from housing. Tag rocker levers for correct position as re- moved to ensure proper reassembly. (7) Remove adjusting screw lock nuts (17) and (25) and adjusting screws (18) and (26). b. Repair of Rocker Arm Shaft Assembly. (1) If shaft outside diameter is not between 1.123 inches to 1.124 inches (28.52 mm to 28.55 mm) replace shaft. (2) Rocker arm shaft bore inside diameter should be 1.243 to 1.125 inches (28.577 to 28.558 mm). If lever shaft does not meet these dimensions, replace shaft. c. Reassembly. (1) Install adjusting screws (20) and (24) and locknuts (19) and (23) in rocker levers. (2) Coat rocker lever shaft with clean lubricating oil. Start shaft (14) into housing (8). Install levers on shaft as shaft is pushed through housing. (3) Coat cup plug (11) contact surfaces with Locktite sealer. Install new cup plug (11) in rocker lever housing (8). (4) Install pipe plug (13) and shaft plug (15) in end of rocker lever housing. Use sealing tape or Locktite to prevent oil leakage. (5) Check all levers for freedom of movement on shaft. (6) Install pipe plug (12). (7) Tighten shaft lockscrews (18) and (26) and adjust so screws contact valve stem, then advance 20 degrees and lock with nuts (17) and (25). NOTE On worn crosshead and guide, it may be necessary to advance 30 degrees to straighten crosshead to guide. (8) Hold adjusting screw in 13-74

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