Valve Clearance: Adjustments

VALVE CLEARANCE ADJUSTMENT PROCEDURE

NOTE: For removal and installation refer to Testing and Inspection.

1. Remove the adjusting shim.
- Turn the camshaft so that the cam lobe for the valve to be adjusted faces up.





- Turn the valve lifter with a screwdriver so that the notches are perpendicular to the camshaft.





- Using Special Service Tool (SST) Valve Lifter Press # 09248-05410 (A), press down the valve lifter and place SST Valve Lifter Stopper # 09248-05420 (B) between the camshaft and valve lifter or use Valve Clearance Adjust Tool Set # 09248-55040 or equivalents. Remove SST (A).

NOTE:
- Apply SST (B) at a slight angle on the side marked with "9" or "7," at the position shown in the illustration.
- When SST (B) is inserted too deeply, it will get pinched by the shim. To prevent it from being stuck, insert it gently from the intake side, at a slight angle.





- Using a small screwdriver and magnetic finger, remove the adjusting shim.

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





- Using a micrometer, measure the thickness of the removed shim.
- Calculate the thickness of a new shim so the valve clearance comes within the specified value.
T: Thickness of used 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 values.

NOTE: Shims are available in 17 sizes in increments of 0.050 mm (0.0020 inch), from 2.500 mm (0.0984 inch) to 3.300 mm (0.1299 inch).

3. Install a new adjusting shim.
- Place a new adjusting shim on the valve lifter, with imprinted numbers facing down.





- Press down the valve lifter with SST (A), and remove SST (B).
4. Recheck the valve clearance.