Valve Clearance: Testing and Inspection
Valve ClearanceINSPECTION
1) Remove the engine from the vehicle.
2) When inspecting #1 and #3 cylinders
(1) Remove the timing belt cover RH.
(2) Disconnect the connector (A) from the exhaust camshaft position sensor RH and the connector (B) form the exhaust oil flow control solenoid valve RH.
(3) Remove the clip which holds the engine harness to the rocker cover.
(4) Remove the ignition coil.
(5) Disconnect PCV hose (A) and vacuum hose (B) from the rocker cover RH.
NOTE:
Pinch the clamp of the PCV hose (A) by fitting the cut out in the ST with the protrusion on the clamp as shown in the figure, and unlock the clamp.
ST 18353AA000 CLAMP PLIERS
(6) Remove the rocker cover RH.
3) When inspecting #2 and #4 cylinders
(1) Remove the timing belt cover RH.
(2) Disconnect the connector (A) from the exhaust camshaft position sensor LH and the connector (B) form the exhaust oil flow control solenoid valve LH.
(3) Disconnect the oil level switch connector.
(4) Remove the clip (A) and bolt (B) securing the engine harness or oil level switch harness to the rocker cover LH.
(5) Remove the ignition coil.
(6) Disconnect PCV hose (A) and vacuum hose (B) from the rocker cover LH.
NOTE:
Pinch the clamp of the PCV hose (A) by fitting the cut out in the ST with the protrusion on the clamp as shown in the figure, and unlock the clamp.
ST 18353AA000 CLAMP PLIERS
(7) Remove the rocker cover LH.
4) Turn the crank pulley clockwise until the round mark on the camshaft sprocket is 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
5) 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.
Valve clearance (inspection value):
Intake
0.20+0.04 -0.06 mm (0.0079+0.0016 -0.0024 in)
Exhaust
0.35±0.05 mm (0.0138±0.0020 in)
6) If necessary, adjust the valve clearance.
7) 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
Tightening torque:
6.4 Nm (0.7 kgf-m, 4.7 ft-lb)
