Impreza WRX STI F4-2.5L DOHC Turbo (2007)
Valve Clearance: Adjustments
Valve Clearance
ADJUSTMENT
NOTE: Perform adjustment of valve clearance while the engine is cold.
1) Measure all the valve clearances.
NOTE: Record each valve clearance after measurement.
2) Remove the camshaft.
3) Remove the valve lifter.
4) Measure the thickness of valve lifter using micrometer.
5) Select a shim of suitable thickness from the following table using the measured valve clearance and valve lifter thickness.