TM 5-4210-220-34 2-19. ENGINE - Continued 2-19.5 Injectors. This task covers a. Adjustment b. Removal c. Inspection d. Installation e. Test f. Repair TOOLS EQUIPMENT CONDITION Shop Equipment, Automotive Main Engine Shutdown (see TM 5-4210-220-12) Maintenance And Repair, APU Shutdown (TM 5-4210-220-12) NSN 4910-00-754-0705 Batteries Disconnected (TM 5-4210-220-12) J22582 Engine Barring Tool Both Engine Compartment Covers Removed J1242 Injector Timing Gage (TM 5-4210-220-12) J22525 Injector Tube Service Tool Set Rocker Cover(s) Removed (see para.  2-19.3) J8932-01 Fuel Pipe Socket J22396 Injector Holding Fixture MATERIALS/PARTS J23010 Injector Tester 10, Appendix B Dry Cleaning Solvent J22640 Injector Auxiliary Tester 5149510 Rocker Cover Gasket J26400 Injector Test Oil J22410 Injector Calibrator J9462-02 Injector Needle Valve Lift Gage WARNING JP-4 is a highly volatile fuel.  Extraordinary care must be taken when servicing components that use this fuel.  The truck shall be grounded to an approved grounding point if it contains JP-4. ADJUSTMENT (1) Adjust exhaust valve clearance as detailed in para.  2-19.7. (2) Place the governor speed control lever in the idle speed position.  If a stop lever is provided, secure it in the stop position. (3) Rotate the crankshaft, with the starting motor or with engine barring tool J22582, until the exhaust valves are fully depressed on the particular cylinder to be timed. NOTE If a wrench is used on the crankshaft bolt at the front of the engine, do not turn the crankshaft in a left- hand direction or rotation or the bolt may loosen. (4) Place the small end of the injector timing gage J1242 in the hole provided in the top of the Injector body with the flat of the gage toward the injector follower. (5) Loosen the injector rocker arm push rod lock nut. 2-180