Valve Clearance: Testing and Inspection

Valve Clearance

INSPECTION

CAUTION:
If engine oil is spilt onto the exhaust pipe, wipe it off with cloth to avoid emission of smoke or causing a fire.

NOTE:
Inspection and adjustment of valve clearance should be performed while engine is cold.

1) Set the vehicle on a lift.
2) Disconnect the ground cable from battery.





3) Remove the air intake duct.
4) Remove the bolt which secures timing belt cover RH.
5) Lift up the vehicle.
6) Remove the under cover.
7) Loosen the remaining bolts which secure timing belt cover RH, then remove the timing belt cover.
8) Lower the vehicle.
9) When inspecting #1 and #3 cylinders

1) Remove the air cleaner case.
2) Remove the ignition coil.
3) Place a suitable container under the vehicle.
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 bolts, then remove the rocker cover RH.

10) When inspecting #2 and #4 cylinders

1) Remove the battery.
2) Remove the secondary air pump.
3) Remove the ignition coil.
4) Place a suitable container under the vehicle.
5) 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





6) Remove the bolts, then remove the rocker cover LH.

11) 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





12) 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)





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

NOTE:
- Use a new rocker cover gasket.
- 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