Cylinder Head And Valves: Inspection: Valve

WARNING: This page is about a different car, the 2003 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.

Fig 1: Identifying Valve Seat Contact And Valve Margin
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
If the margin is below the limit, replace the valve.
1. Standard value:
  1. < Intake > 1.0 mm (0.03 inch)
  2. < Exhaust > 1.2 mm (0.04 inch)
2. Minimum limit:
  1. < Intake > 0.5 mm (0.02 inch)
  2. < Exhaust > 0.7 mm (0.03 inch)
Measure the valve's total length. If the measurement is less than the limit, replace the valve.
1. Standard value:
  1. < Intake > 112.30 mm (4.421 inches)
  2. < Exhaust > 114.11 mm (4.493 inches)
2. Minimum limit:
  1. < Intake > 111.80 mm (4.402 inches)
  2. < Exhaust > 113.61 mm (4.473 inches)
    
    Fig 2: Identifying Valve Total Length
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.