Valve Clearance: Testing and Inspection

INSPECTION

HINT: Inspect and adjust the valve clearance when the engine is cold.

1. REMOVE INTAKE AIR CONNECTOR
2. REMOVE PCV HOSES
3. DISCONNECT HIGH-TENSION CORDS FROM SPARK PLUGS

NOTICE: Pulling on or bending the cords may damage the conductor inside.

4. DISCONNECT ENGINE WIRE
a. Disconnect these connectors:
- w/ A/C: A/C compressor connector
- Oil pressure sensor connector
- Engine coolant temperature sender gauge connector
- Ignition Coil connector
b. Disconnect the 4 engine wire clamps and engine wire.





5. REMOVE CYLINDER HEAD COVER
Remove the 10 bolts, seal washers, cylinder head cover and gasket.
6. SET NO.1 CYLINDER TO TDC/COMPRESSION





a. Turn the crankshaft pulley clockwise and align its groove with the "0" mark on the timing chain cover.





b. Check that the timing marks (1 and 2 dots) of the camshaft drive and driven gears are in straight line on the cylinder head surface as shown in the illustration. If not, turn the crankshaft 1 revolution (360°) and align the marks as above.
7. INSPECT VALVE CLEARANCE





a. Check only the valves indicated.
- Using a thickness gauge, measure the clearance between the valve lifter and camshaft.
- Record the out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.
Valve clearance (Cold):
Intake: 0.15 - 0.25 mm (0.006 - 0.010 inch)
Exhaust: 0.25 - 0.35 mm (0.010 - 0.014 inch)
b. Turn the crankshaft pulley 1 revolution (360°) and align its groove with timing mark "O" of the timing chain cover.





c. Check only the valves indicated as shown. Measure the valve clearance. (See procedure in step (a))
8. ADJUST VALVE CLEARANCE
a. Remove the adjusting shim.





- Turn the crankshaft to position the cam lobe of the camshaft on the adjusting valve upward.
- Position the notch of the valve lifter toward the spark plug side.





- Using Special Service Tool (SST) (A), press down the valve lifter and place (SST) (B) between the camshaft and valve lifter flange. Remove SST (A).
SST 09248-55040 (09248-05410, 09248-05420)

HINT:
^ Apply SST (B) at slight angle on the side marked with "9", at the position shown in the illustration.





- Remove the adjusting shim with a small screwdriver and magnetic finger.
b. Determine the replacement adjusting shim size by these Formula or Charts:





- Using a micrometer, measure the thickness of the removed shim.
- Calculate the thickness of a new shim so that the valve clearance comes within the specified value.
T...Thickness of removed shim
A...Measured valve clearance
N...Thickness of new shim
Intake: N = T + (A - 0.20 mm (0.008 inch))
Exhaust: N = T + (A - 0.30 mm (0.012 inch))








- Select a new shim with a thickness as close as possible to the calculated value.

HINT: Shims are available in 17 sized in increments of 0.05 mm (0.0020 inch), from 2.50 mm (0.0984 inch) to 3.30 mm (0.1299 inch).

c. Install a new adjusting shim.
- Place a new adjusting shim on the valve lifter.





- Using SST (A), press down the valve lifter and remove SST (B).
SST 09248-55040 (09248-05410, 09248-05420)
d. Recheck the valve clearance.
9. REINSTALL CYLINDER HEAD COVER
10. RECONNECT ENGINE WIRE
11. REINSTALL HIGH-TENSION CORDS TO SPARK PLUGS
12. REINSTALL PCV HOSES
13. REINSTALL INTAKE AIR CONNECTOR