Loosen the valve on the regulator and apply the specified air pressure. Specified Air Pressure: 250 kPa (2.5 kgf/cm2, 36 psi) With the specified air pressure applied, push up the timing plate (A); the synchronising piston will pop out and engage the intake primary rocker arm (B) and intake secondary rocker arm (C). NOTE: The synchronising piston (D) can be seen in the gap between the secondary and primary rocker arms. When the timing plate is engaged in the groove A (E) on the timing piston (F), the piston will be locked in the pushed out piston.

Stop applying air pressure and push up the timing plate (A); the synchronising piston (B) will return to its original position with a click. Visually check the disengagement of the synchronising piston. Replace the intake rocker arms as an assembly if there is any abnormality. NOTE: When the timing plate is pushed up, it releases the timing piston (C), letting the return spring (D) move the synchronising piston to its original positions. Remove the valve inspection set from the inspection hole A, then tighten the sealing bolt. Remove the sealing bolt (A) from the inspection hole B (B) and connect the valve inspection set.