Impreza L Sport Wagon F4-2.2L SOHC (1999)
2. VALVE SEAT
Inspect intake and exhaust valve seats, and correct the contact surfaces with valve seat cutter if they are defective or when valve guides are
replaced.
Valve seat width: W
Intake
Standard: 1.0 mm (0.039 inch)
Limit: 1.7 mm (0.067 inch)
Exhaust
Standard: 1.4 mm (0.055 inch)
Limit: 2.1 mm (0.083 inch)
3. VALVE GUIDE
1. Check the clearance between valve guide and stem. The clearance can be checked by measuring the outside diameter of valve stem and the
inside diameter of valve guide with outside and inside micrometers respectively.
Clearance between the valve guide and valve stem:
Standard
Intake: 0.035 - 0.062 mm (0.0014 - 0.0024 inch)
Exhaust: 0.040 - 0 .067 mm (0.0016 - 0.0026 inch)
Limit: 0.15 mm (0.0059 inch)
Valve guide inner diameter: 6.012 mm (0.2362 - 0.2367 inch)
Valve stem outer diameters:
Intake: 5.950 - 5.965 mm (0.2343 - 0.2348 inch)
Exhaust: 5.945 - 5.960 mm (0.2341 - 0.2346 inch)
2. If the clearance between valve guide and stem exceeds the specification, replace guide as follows:
1. Place cylinder head on ST1 with the combustion chamber upward so that valve guides enter the holes in ST1.
