Turn the adjusting screw down until the rocker lever just touches the feeler gauge. See Table 2-9 for valve clearance valves.ģ. Insert the proper feeler gauge between the rocker lever and crosshead contact surfaces. Loosen both locknuts on the intake and exhaust valve adjusting screws.Ģ. See Table 2-3 for the correct valves to adjust.Įxample: When 1-6 “VS” is used, the injector on cylinder number 3 is adjusted and the valves on cylinder number 5 are adjusted.ġ. The “VS” markets used when adjusting the injectors is also used when adjusting the valves however, the valves to be adjusted are not on the same cylinder as the injector. Valve spring retainer to crosshead clearance.

Tighten must be a minimum of 0.025 inch clearance.įig.2-19. Check the clearance between the crosshead and valve spring retainer 1 and 2.

Note: When ST-669 Torque Wrench Adapter is used, tighten the locknut to 22 to 26 ft-lb torque.Ĥ. Tighten the adjusting screw locknut to 25 to 30 ft-lb torque. Hold the adjusting screw in this position and tighten the locknut.ģ. Turn the adjusting screw back in until it touches the valve stem. Hold the crosshead down against its mating valve stem. Turn the adjusting screw out at least one turn.Ģ.

Loosen the locknut on the crosshead adjusting screw. Note: Crosshead adjustment should always be made before attempting to adjust the valves.ġ. Pay attention to reading and you will learn more. This post is mainly written to introduce how to adjust crosshead, injector and valves of Cummins NT diesel engines correctly.

Cummins 350 big cam valve adjustment