24. SERVICE PROCEDURE 6. The valves and injectors on the same cylinders are not adjusted at the same index mark on the accessory drive pulley on STC engines . One pair of valves and one injector are adjusted at each pulley index mark before rotating the accessory drive to the next index mark. Two crankshaft revolutions are required to adjust all the valves and injectors. 7. The adjustment can begin on any valve set mark. In the following example, the adjustment will begin on the “A” valve set mark with cylinder number five valves closed and cylinder number three injec- tor ready for adjustment.
Rotate the accessory drive clockwise until the “A” valve set mark on the accessory drive pulley is aligned with the pointer on the gear cover. Injector Adjustment 1. When the “A” mark is aligned with the pointer, the intake and exhaust valves for cylinder number five must be closed. If these conditions ar not correct, cylinder number four injector and cylinder number two valves must be ready to set. Both valves are closed when both rocker levers are loose and can be moved from side to side. 2. Loosen the injector adjusting screw locknut on cylinder number three. Tighten the adjusting screw until all the clearance is removed from the injector train.
Tighten the adjusting screw one additional turn to correctly seat the link. 3. Loosen the injector adjusting screw until the STC tappet touches the top-cap of the injector. Be sure to loosen the adjusting screw enough, so there is no preload on the injector. This will be accomplished when the rocker lever is loose enough to move. PC450-ENG 3-68