Valve Clearance: Adjustments

NOTE: Adjust the valve clearance when the engine is cold.

A. Except for rear valves of No. 6 cylinder.
(a) Remove the adjusting shim.





^ Turn the camshaft so that the cam lobe for the valve to be adjusted faces up.
^ Position the notch of the valve lifter toward the spark plug side.





^ Using Special Service Tool (SST) Valve Clearance Adjust Tool Set # 09248 - 55050 or (A) (Valve Lifter Press # 09248 - 05510), press down the valve lifter and place SST (B) Valve Lifter Stopper # 09248 - 06020 or equivalents between the camshaft and valve lifter. Remove SST (A).

NOTE:
^ Apply SST (B) at slight angle on the side marked with "11", 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 shallowly from the outside of the cylinder head, at a slight angle.





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





(b) 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 that 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 value.

Adjusting Shim Selection Chart (Intake):

Adjusting Shim Selection Chart (Exhaust):

NOTE: Shims are available in 17 sizes 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 Valve Clearance Adjust Tool Set # 09248 - 55050 or (A) (Valve Lifter Press # 09248 - 05510), press down the valve lifter and remove SST (B) Valve Lifter Stopper # 09248 - 06020 or equivalents.
(d) Recheck the valve clearance.

B. Rear valves of No. 6 cylinder.
(a) Remove the distributor.
(b) Remove the camshafts.
(c) Remove the adjusting shim with a small screwdriver.





(d) 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 that 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 value.

Adjusting Shim Selection Chart (Intake):

Adjusting Shim Selection Chart (Exhaust):

NOTE: Shims are available in 17 sizes in increments of 0.05 mm (0.0020 inch), from 2.50 mm (0.0984 inch) to 3.30 mm (0.1299 inch).
(e) Place a new adjusting shim on the valve lifters.
(f) Install the camshafts.
(g) Recheck the valve clearance.
(h) Install the distributor.