Cylinder Head And Valves: Inspection: Valve

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.

Check the valve seat contact. Valve seat contact should be uniform at the center of the valve face. If incorrect, reface using a valve refacer.
If the margin is below the limit, replace the valve.
Standard value:

Intake 1.0 mm (0.03 inch)

Exhaust 1.2 mm (0.04 inch)

Minimum limit:

Intake 0.5 mm (0.02 inch)

Exhaust 0.7 mm (0.03 inch)

Fig 1: Checking Flatness Of Lower Surface Of Cylinder Head
Measure the valve's total length. If the measurement is less than the limit, replace the valve.
Standard value:

Intake 111.84 mm (4.403 inches)

Exhaust 114.04 mm (4.490 inches)

Minimum limit:

Intake 111.34 mm (4.384 inches)

Exhaust 113.54 mm (4.470 inches)

Fig 2: Identifying Valve Total Length