Valve Guide
WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
Measure clearance between the valve guide and valve stem. If the clearance exceeds the limit, replace the valve guide or valve, or both.
Standard value: Inlet 0.020 - 0.047 mm (0.0008 - 0.0019 inch) Exhaust 0.030 - 0.057 mm (0.0012 - 0.0022 inch)
Limit: Inlet 0.10 mm (0.0039 inch) Exhaust 0.15 mm (0.0059 inch)