•WARNING• Diesel fuel is flammable. Do not perform fuel system procedures near open flame. Injury to personnel may result. NOTE Timing refers to when the fuel is injected into the cylinder. In order for the engine to run efficiently, the fuel must be injected a set number of crankshaft degrees before top center (TC). Always perform injector timing when an injector has been removed and reinstalled or replaced. LOCATING TOP CENTER POSITION FOR NO. 1 PISTON 1. Remove plug (4) and O-ring (3) from timing hole (2) on flexplate housing (1). Discard O-ring (3). 2. Install timing bolt in timing hole (2) on flexplate housing (1). NOTE When turning crankshaft, use the four large screws on front of crankshaft. Do not use the eight small screws on front of crankshaft pulley. If rocker arm assemblies have been removed and installed prior to setting fuel timing, rotate crankshaft two complete revolutions to allow rocker arms to properly seat on injectors. 3. Turn crankshaft clockwise until timing bolt engages non-threaded hole in flywheel. ADJUSTMENT 1. Clean holding fixture and set block with lint-free cloth. 2. Press top ball on pivot arm of holding fixture fully and hold. 3. Position holding fixture on set block with side edge of set block against stabilizing blade, top edge of set block against indicator contact point, and inside bottom edge of set block against base of holding fixture. 4. Release top ball on pivot arm of holding fixture. 5. Set double zero on the vertical dial indicator. a. Loosen red thumb screw on rear of holding fixture and slide vertical dial indicator vertically until small needle lines up on zero. Tighten red thumb screw. b. Loosen bezel screw on vertical dial indicator and turn bezel until large needle lines up on zero. Tighten bezel screw. 6. Remove set block from holding fixture. 0322 00-2 TM 9-2320-386-24-1-2 0322 00 FUEL INJECTOR TIMING MAINTENANCE (Contd)