Valve Clearance: Testing and Inspection

Valve Clearance

INSPECTION
1) Disconnect the ground cable from battery.





2) Remove the engine unit from vehicle.
3) Remove the timing belt cover RH.
4) When inspecting #1 and #3 cylinders
1) Disconnect the connectors from the exhaust camshaft position sensor RH and exhaust oil flow control solenoid valve RH.
2) Remove the clip (A) which hold the engine harness to the rocker cover RH.





3) Remove the ignition coil.
4) Disconnect the PCV hose from the rocker cover RH.

NOTE:
For the PCV hose affixed with the clamp, fit the depression in the ST with the protrusion of the clamp as shown in the figure below, unlock the clamp and disconnect.

ST 18353AA000 CLAMP PLIERS





5) Remove the rocker cover RH.
5) When inspecting #2 and #4 cylinders
1) Remove the secondary air pump.
2) Disconnect the connectors from the exhaust camshaft position sensor LH and exhaust oil flow control solenoid valve LH.
3) Remove the ignition coil.
4) Disconnect the PCV hose from the rocker cover LH.

NOTE:
For the PCV hose affixed with the clamp, fit the depression in the ST with the protrusion of the clamp as shown in the figure below, unlock the clamp and disconnect.

ST 18353AA000 CLAMP PLIERS





5) Remove the rocker cover LH.
6) Turn the crank pulley clockwise until the round mark and arrow mark on the cam sprocket are set to position shown in the figure.

NOTE:
Turn the crank pulley using a socket wrench.
^ Measurement of clearance of #1 cylinder intake valve and #3 cylinder exhaust valve





^ Measurement of clearance of #2 cylinder exhaust valve and #3 cylinder intake valve





^ Measurement of clearance of #2 cylinder intake valve and #4 cylinder exhaust valve





^ Measurement of clearance of #1 cylinder exhaust valve and #4 cylinder intake valve





7) Measure the clearance of intake valve and exhaust valve using thickness gauge (A).

NOTE:
^ Insert a thickness gauge in a direction as horizontal as possible with respect to the valve lifter.
^ Lift up the vehicle, and then measure the exhaust valve clearances.
^ If the measured value is not within the inspection value, take notes of the value in order to adjust the valve clearance later on.





8) If necessary, adjust the valve clearance.
9) After inspection, install the related parts in the reverse order of removal.

NOTE:
^ Refer to "Camshaft" when installing the rocker cover.
^ Use a new clamp for the PCV hose clamp, fit the cut out in the ST with the protrusion on the clamp as shown in the figure, and lock the clamp.

ST 18353AA000 CLAMP PLIERS