Rio L4-1.6L (2004)
5. Measure inside diameter of each valve guide at points shown in figure.
6. Calculate valve stem-to-valve guide clearance. Subtract outer diameter of valve stem from inside diameter of respective valve guide.
7. If clearance exceeds specification, replace valve, and/or valve guide.
8. Measure protrusion height of each valve guide. Replace valve guide as needed.
NOTE: Intake and exhaust valve guides are different. Be sure to use correct valve guide.
VALVE SEAT
1. Inspect contact surface of each valve seat and valve face for following:
a. Roughness
b. Damage
c. Pitting
d. Cracks