CHECK .WARNING. Diesel fuel is flammable. Do not perform fuel system procedures near open flame. Injury to personnel may result. CAUTION Engine must be at ambient temperature prior to valve clearance check and adjustment. NOTE Valve clearance check is measured between the rocker arm and valve. All clearance measurements and adjustments are made with applicable valves fully closed. 1. Remove plug (4) and O-ring (3) from timing hole (2) on flexplate housing (1). 2. Install timing bolt in timing hole (2) on flexplate housing (1). NOTE When turning the crankshaft, finger-tighten adjusting screws to properly seat push rods in ball of adjusting screws. When turning the crankshaft, use the four large screws on the front of the crankshaft. Do not use the eight small screws on the front of the crankshaft pulley. No. 1 piston is on compression stroke if intake and exhaust valves are closed and rocker arms can be moved by hand. No. 1 piston is on exhaust stroke if intake and exhaust valves are open and rocker arms cannot be moved by hand. 3. Turn crankshaft clockwise until timing bolt engages non-threaded hole in flywheel. NOTE Refer to table 1, Crankshaft Positions for Valve Clearance Setting, to make adjustments to valves at the correct stroke. 4. Using feeler gauge, check intake and exhaust valve clearance between rocker arm (6) and valve (5). a. Intake valve clearance should be 0.012-0.018 in. (0.30-0.46 mm). If clearance is not within limits, adjust valve(s) (adjustment task). b. Exhaust valve clearance should be 0.022-0.028 in. (0.56-0.71 mm). If clearance is not within limits, adjust valve(s) (adjustment task). 0311 00-2 TM 9-2320-386-24-1-2 0311 00 INTAKE AND EXHAUST VALVE CLEARANCE CHECK AND ADJUSTMENT (Contd)