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 CYLINDER HEAD COVERS
3. 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) of the camshaft drive and driven gears are in straight line on the cylinder heads surface as shown in the illustration.
If not, turn the crankshaft 1 revolution (360°) and align the marks.
4. INSPECT VALVE CLEARANCE





a) Check only the valves indicated in the illustration.
1) Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
2) Record 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 2/3 of a revolution (240°), and check only the valves indicated in the illustration. Measure the valve clearance. (See step (a))





c) Turn the crankshaft a further 2/3 of a revolution (240°), and check only the valves indicated in the illustration. Measure the valve clearance. (See step (a))
5. ADJUST VALVE CLEARANCE
a) Remove the adjusting shim.





1) Turn the camshaft so that the cam lobe for the valve to be adjusted faces up.
2) Turn the valve lifter with a screwdriver so that the notches are perpendicular to the camshaft.





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

HINT:
- 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.





4) Using a small screwdriver and magnetic finger, remove the adjusting shim.
b) Determine the replacement adjusting shim size by following the Formula or Charts:





1) Using a micrometer, measure the thickness of the removed shim.
2) 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 - 0.18 mm (0.007 inch))
Exhaust: N = T + (A - 0.32 mm (0.013 inch))








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

HINT: 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).





c) Install a new adjusting shim.
1) Place a new adjusting shim on the valve lifter, with imprinted numbers facing down.
2) Using SST (A), press down the valve lifter and remove SST (B).
SST 09248-55040 (09248-05410, 09248-05420)
d) Recheck the valve clearance.
6. REINSTALL CYLINDER HEAD COVERS
7. REINSTALL INTAKE AIR CONNECTOR