Valve Clearance: Adjustments

ADJUSTMENT





1. ADJUST VALVE CLEARANCE
(a) Turn the camshaft so that the cam lobe faces upward.
(b) Turn the valve lifter with a screwdriver so that the notches are perpendicular to the camshaft.





(c) 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 becoming stuck, insert it gently from the intake side at a slight angle.





(d) Using a small screwdriver and magnetic finger, remove the adjusting shim.





(e) Using a micrometer, measure the thickness of the removed shim.
(f) Calculate the thickness of a new shim so that the valve clearance comes within the specified value.





Specified value (Cold):
Intake A = B + (C - 0.20 mm (0.0079 inch))
Exhaust A = B + (C - 0.30 mm (0.0118 inch))
(g) Select a new shim with a thickness as close as possible to the calculated values.
EXAMPLE (Intake):
Measured valve clearance = 0.45 mm (0.0177 inch)
0.45 mm (0.0177 inch) - 0.20 mm (0.0079 inch) = 0.25 mm (0.0098 inch)
(Measured - Specification = Excess clearance)
Us shim measurement = 2.80 mm (0.1102 inch)
0.25 mm (0.0098 inch) + 2.80 mm (0.1102 inch) = 3.05 mm (0.1201 inch)
(Excess clearance + Used shim = ideal new shim)
Closest new shim = 3.05 mm (0.1201 inch)
Select No. 12 shim

HINT:
^ 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).
^ Refer to adjusting shim selection chart.





Intake valve clearance (Cold): 0.15 to 0.25 mm (0.006 to 0.010 inch)
EXAMPLE:

The 2.800 mm (0.1102 inch) shim is installed, and the measured clearance is 0.450 mm (0.0177 inch). Replace the 2.800 mm (0.1102 inch) shim with a new No.12 shim.

New Shim Thickness mm (inch):

HINT: A shim's thickness is written on its face in millimeters.





Exhaust valve clearance (Cold): 0.25 to 0.35 mm (0.010 to 0.014 inch)
EXAMPLE:
The 2.800 mm (0.1102 inch) shim is installed, and the measured clearance is 0.450 mm (0.0177 inch). Replace the 2.800 mm (0.1102 inch) shim with a new No. 10 shim.

New Shim Thickness mm (inch):

HINT: A shim's thickness is written on its face in millimeters.





(h) Place a new adjusting shim on the valve lifter with the imprinted number facing down.
(i) Press down the valve lifter with SST (A), and remove SST (B).
SST 09248-55040 (09248-05410, 09248-05420)
(j) Recheck the valve clearance.