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A continuación le envio el procedimiento tomado del manual, lamentablemente el manual solo viene en ingles y espero sea de su utilidad, recuerde valorar el servicio mediante las estrellas.
Here is procedure for setting valves
Inlet0.38 mm (0.015 inch)
Exhaust0.76 mm (0.030 inch)
Adjust the valve lash while the engine is stopped. Use the following procedure in order to adjust the valves:
Note: If the engine is equipped with an engine compression brake, loosen the adjusting screw for the lash on the slave piston for the compression brake prior to adjusting the engine valve lash. Refer to the Testing and Adjusting, "Slave Piston Lash - Adjust" topic in order to adjust the slave piston lash.
Note: See Testing and Adjusting, "Finding Top Center Position for the No. 1 Piston" for further details.
Before any adjustments are made, lightly tap each rocker arm at the top of the adjustment screw. Use a soft mallet to ensure that the lifter roller seats against the camshaft's base circle.