Valve Clearance: Adjustments

INSPECTION

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

1. REMOVE V-BANK COVER
2. REMOVE INTAKE AIR CONNECTOR PIPE
3. REMOVE IGNITION COILS





4. REMOVE LH CYLINDER HEAD COVER
a. Remove the bolt, and pull out the oil dipstick and guide for the engine.
b. Remove the bolt, and pull out the oil dipstick and guide for the transmission.
c. Disconnect the PCV valve on the PCV hose from the, cylinder head cover.
d. Disconnect the 2 hoses for the EVAP from the line tubes.
e. Disconnect the wire clamp from the wire bracket on the cylinder head cover.
f. Remove the bolt, and disconnect the hose bracket for the EVAP from the cylinder head cover.
g. Remove the bolt, and disconnect the engine wire protector from the camshaft bearing cap.
h. Remove the 9 bolts, 9 seal washers and cylinder head cover.





5. REMOVE RH CYLINDER HEAD COVER
a. Remove the bolt, and disconnect the wire clamp bracket from the camshaft bearing cap.
b. Remove the bolt, and disconnect the engine wire protector from the cylinder head.
c. Remove the 9 bolts, 9 seal washers and cylinder head cover.
6. SET NO.1 CYLINDER TO TDC/COMPRESSION





a. Turn the crankshaft pulley, and align its groove with timing mark "0" of the No.1 timing belt cover.





b. Check that the timing marks (1 dot mark) of the intake and exhaust camshaft gears on the LH bank are aligned. If not, turn the crankshaft 1 revolution (360°) and align the mark as above.
7. INSPECT VALVE CLEARANCE





a. Check only the valves indicated.
1) Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
2) Record the out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.





Valve clearance (Cold):





b. Turn the crankshaft 1 revolution (360°) and align the mark as above. (See procedure in step 9)
c. Check only the valves indicated as shown. Measure the valve clearance. (See procedure in step (a))
8. ADJUST VALVE CLEARANCE
a. Disconnect the timing belt from the camshaft timing pulleys.
b. Remove the camshafts.





c. Remove the valve lifter and adjusting shim.

NOTICE: Be careful not to drop the adjusting shim into the lifter hole when removing the valve lifter.

Intake Valve Adjustment Chart:

Exhaust Valve Adjustment Chart:

d. Determine the replacement adjusting shim size according to these Formula or Charts:





1) Using a micrometer, measure the thickness of the removed shim.
2) 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





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

HINT: Shims are available in 41 increments of 0.020 mm (0.0008 inch), from 2.00 mm (0.0787 inch) to 2.80 mm (0.1102 inch).

e. Reinstall a new adjusting shim to the spring retainer.
f. Reinstall the valve lifter.
g. Reinstall the camshafts.
h. Reconnect the timing belt to the camshaft timing pulleys.
i. Recheck the valve clearance.
9. REINSTALL CYLINDER HEAD COVERS
10. REINSTALL IGNITION COILS
11. REINSTALL INTAKE AIR CONNECTOR PIPE
12. REINSTALL V-BANK COVER