With the specified air pressure applied, rotate the crankshaft clockwise, and visually check that all the primary rocker arms (A) and secondary rocker arms (B) move together.
If the primary rocker arm and secondary rocker arm move freely and independently of each other, remove the primary and secondary rocker arms as an assembly, and check that the pistons in the primary and secondary rocker arms move smoothly. If any rocker arm needs replacing, replace the primary and secondary rocker arms as an assembly, and test.