Impreza WRX F4-2.0L DOHC Turbo (2004)
Valve Clearance: Adjustments
NOTE: The content of this article/image reflects the changes called out by TSB 18-88-05.
Valve Clearance
ADJUSTMENT
CAUTION: Adjustment of valve clearance should be performed while engine is cold.
1) Measure all valve clearances.
NOTE: Record each valve clearance after it has been measured.
2) Remove the camshaft.
3) Remove the valve lifter.
4) Measure the thickness of valve lifter with a micrometer.
5) Based on the measured valve clearance and valve lifter thickness, obtain the correct amount of shims from the following table.
6) Set the correct amount of shims to the valve lifter.
