Valve Clearance: Adjustments

NOTE: This engine uses hydraulic lash adjusters. Periodic valve clearance adjustment is not necessary. When the hydraulic lash adjusters have been replaced or reinstalled, perform the following adjustment procedure.

Adjustment
1) Perform adjustment in cold condition [coolant temperature: 20 to 40°C (68 to 104° F)].
2) Retighten cylinder head nuts and bolts previously if necessary.
3) Adjust hydraulic valve lifter with the following procedures:
a. Perform adjustment in two (2) sequences.

Sequence (I)
Position #1 cylinder at TDC (compression), and adjust the valve lifters for intake and exhaust valves on #1 cylinder, for exhaust valve on #3 cylinder and for intake valve on #4 cylinder.

Sequence (II)
Position #2 cylinder at TDC (compression), and adjust intake and exhaust valves on #2 cylinder, intake valve on #3 cylinder and exhaust valve on #4 cylinder.





b. Raise up the bend of lock washer, loosen the lock nut, and then turn the valve rocker screw clock- wise by approx. four (4) turns using Valve Clearance Adjuster 498767000.





c. Leave it with the valves opened for approx. 15 minutes.





d. Unscrew the valve rocker screw gradually. Then, the rocker arm stops moving due to the closing of valve. This condition is called "Zero Point".





e. Moreover, unscrew the valve rocker screw counterclockwise by 1.5 turns.
f. Tighten the lock nut, and bend the lock washer.