Rocker Arm Piston Operation Check

ROCKER ARM PISTON OPERATION CHECK





1. Remove all of the ignition coils.
2. Remove the rocker cover.
3. Remove the engine oil control valve.
4. Remove the engine oil pressure switch.
5. Turn the crankshaft clockwise until the notch on the crankshaft pulley is lined up with "T" mark on the lower cover of timing belt.
6. Move the rocker arms on the No. 1 and No.4 cylinders up and down by hand to determine which cylinder has its piston at the top dead center on the compression stroke.





NOTE: The rocker arm piston operation check can be per formed on rocker arms indicated by white arrow mark when the No. 1 cylinder piston is at the top dead center on the compression stroke, and on rocker arms indicated by black arrow mark when the No. 4 cylinder piston is at the top dead center on the compression stroke.





7. While shutting up the oil passage hole at the depth of the engine oil control valve's installation hole by finger not to leak air, blow compressed air into the engine oil pressure switch's installation hole by air blowgun. At this time, confirm that the rocker arm piston can operate.

NOTE: To fully confirm the check, prevent the compression air from leaking as much as possible by bind vinyl tape to the end of air blowgun. The compression air pressure is required more than 620 kPa (90 psi).

8. Turn the crankshaft clockwise until the notch on the crankshaft pulley is lined up with the "T" mark on the lower cover of timing belt.
9. Confirm the rest of the rocker arm pistons under the procedure 7.
10. When the rocker arm piston does not operate, replace the rocker arm assembly.
11. Install the engine oil pressure switch and the engine oil control valve.
12. Install the rocker cover.
13. Install all of the ignition coils.