Valve Clearance: Adjustments

Adjusting Shim Selection Using Chart
Intake





Exhaust





INSPECTION AND ADJUSTMENT OF VALVE CLEARANCE

NOTE: Check and adjust the valve clearance while the engine is cold.

1. REMOVE CYLINDER HEAD COVERS WITH GASKETS
2. INSPECT VALVE CLEARANCE




(a) Set No.1 cylinder to TDC/compression.
^ Turn the crankshaft pulley and align its groove with the "0" mark 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.

(b) Measure the clearance of half of the valves.





^ Measure only those valves indicated in the figure. Record the measurements which are out of specification. They will be used later to determine the required replacement shims.

Valve clearance (Cold):
Intake 0.15 - 0.25 mm (0.006 - 0.010 in.)
Exhaust 0.20 - 0.30 mm (0.008 - 0.012 in.)

(Reference)
Valve clearance (Hot):
Intake 0.20 - 0.30 mm (0.008 - 0.012 in.)
Exhaust 0.26 - 0.36 mm (0.010 - 0.014 in.)

(c) Turn the crankshaft pulley one revolution and measure the other valves.
^ Turn the crankshaft pulley one revolution and align the timing marks as stated in (a) above.





^ Measure only the valves indicated as shown.

3. ADJUST VALVE CLEARANCE




(a) Using SSTs, press down the valve lifter with SST A and hold the valve lifter down with SST B. SST: 09248-55010

NOTE: Before pressing down the valve lifter, position the notch as shown in the figure.





(b) Remove the adjusting shim with a small screwdriver and magnetic finger.

NOTE: For easy removal of the shim, when setting SST B, set it on the lifter so there is a wide space in the removal direction.

(c) Determine the replacement shim size by using the following Formula or Charts.





^ Using a micrometer, measure the thickness of the shim which was removed.
^ Calculate the thickness of the new shim so the valve clearance comes within specified value.

T = Thickness of shim used
A = Valve clearance measured
N = Thickness of shim new
Intake side: N = T + (A - 0.20 mm (0.008 in.)
Exhaust side: N = T + (A - 0.25 mm (0.010 in.)

^ Select a 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 in.), from 2.500 mm (0.0984 in.) to 3.300 mm (0.1299 in.).

(d) 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 09248-55010

4. RECHECK VALVE CLEARANCE
5. INSTALL CYLINDER HEAD COVERS WITH GASKETS