24. SERVICE PROCEDURE 24.7.3 CHECK & ADJUST INJECTOR AND VALVE CLEARANCE 1. All valve and injector adjustment must be made when the engine is cold, any stabilized coolant temperature at 60°C [140°F] or below. 2. Remove the air piping from the intake maniflold. Remove the hose from the crankcase breather. Remove the 16 capscrews and the rocker lever cover. Remove the 16 isolators from the cover. 3. The valve set marks are located on the accessory drive pulley. The marks align with a pointer on the gear cover. Warning: Do not pull or pry on the fan to manually rotate the engine. To do so can damage the fan blades.
Damged fan blades can cause premature fan failures which can result in serious personal injury or property damage. Use the accessory drive shaft to rotate the crankshaft. 4. The crankshaft is clockwise when viewed from the front of the en- gine. The cylinders are numbered from the front gear housing end of the engine. The engine firing order is 1-5-3-6-2-4. 5. Each cylinder has three rocker levers: The long rocker lever (E) is the exhaust lever. The center rocker lever is the injector lever. The short rocker lever (I) is the intake lever. Refer to the accompanying chart for valve rocker lever locations. PC450-ENG 3-67