Valve Clearance: Adjustments

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









1. Disconnect the high-tension cords at the rubber boot. DO NOT pull on the cords.

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

2. Disconnect the PCV hoses, loosen the two wire harness clamp bolts (No. 2 timing belt cover) mounting bolts, remove the four nuts, grommets, cylinder head cover and gasket.





NOTE: Arrange the grommets in correct order, so that they can be reinstalled into their original positions. This minimizes any possibility of oil leakage due to reuse of grommets.






3. Set No. 1 cylinder to TDC/compression by turning the crankshaft pulley and align its groove with timing mark "0" of the No. 1 timing belt cover. Check that the valve lifters on the No. 1 cylinder are loose and valve lifters on the No. 4 are tight. If not, turn the crankshaft one revolution (360°) and align the mark as above.





4. Inspect valve clearance of 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 0.19-0.29 mm (0.007-0.011 in.)
Exhaust 0.28-0.38 mm (0.011-0.015 in.)





5. Turn the crankshaft one revolution (360°) and align the mark as above. (See procedure in step 3). Check only the valves indicated as shown. Measure the valve clearance. (See procedure in step (4))





6. Adjust valve clearance by removing the adjusting shim.
^ Turn the crankshaft so that the cam lobe for the valve to be adjusted faces up.
^ Using SST (A), press down the valve lifter and place SST (B) between the camshaft and valve lifter. Remove SST (A).
SST 09248-55020 (09248-05011, 09248-05021)





NOTE: Before pressing down the valve lifter, position its notch toward the spark plug side.

^ Remove the adjusting shim with a small screwdriver and magnetic finger.





NOTE: For easy removal of the shim, when positioning SST (B), set it on the lifter so there is space enough to be able to remove the shim.





7. Determine the replacement adjusting shim size by following the 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 specified value.

T =Thickness of used shim
A =Measured valve clearance
N =Thickness of new shim





Intake: N = T + (A-0.24 mm (0.009 in.)





Exhaust: N = T + (A-0.33 mm (0.013 in.)

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

NOTE: Shims are available in seventeen sizes in increments of 0.05 mm (0.0020 in.), from 2.50 mm (0.0984 in.) to 3.30 mm (0.1299 in.).





8. 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 09248-50020 (09248-05011, 09248-05021)
^ Recheck the valve clearance.






9. Reinstall cylinder head cover
a. Remove any old packing Formed in Place Gasket (FIPG) material.
b. Apply seal packing to the cylinder head as shown in the illustration.
Seal packing: Part No. 08826-00080 or equivalent





c. Install the gasket to the head cover and install the head cover with the four grommets and nuts. Uniformly tighten the nuts in several passes.
Torque: 23 Nm (17 ft lb)

NOTE: Install the grommets so that their markings are as shown in the illustration.

d. Tighten the two wire harness clamp ( No. 2 timing belt cover) mounting bolts and connect the PCV hoses.
10. Reconnect high-tension cords to spark plugs.