Aerio L4-2.3L (2006)
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Seating contact width:
Create contact pattern on each valve in the usual manner, i.e., by giving uniform coat of marking compound to valve seat and by rotatingly tapping
seat with valve head. Valve lapper (tool used in valve lapping) must be used.
Pattern produced on seating face of valve must be a continuous ring without any break, and the width of pattern must be within specified range.
Standard seating width revealed by contact pattern on valve face
Intake and Exhaust: 1.1 - 1.3 mm (0.0433 - 0.0512 inch)
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Valve seat repair:
A valve seat not producing a uniform contact with its valve or showing width of seating contact that is out of specified range must be repaired by
regrinding or by cutting and regrinding and finished by lapping.
a. EXHAUST VALVE SEAT: Use valve seat cutters (1) to make two cuts as illustrated in figure. Two cutters must be used: the first for making
15° angle, and the second for making 45° angle. The second cut must be made to produce desired seat width.
Seat width for exhaust valve seat: 1.1 - 1.3 mm (0.0433 - 0.0512 inch)
b. INTAKE VALVE SEAT: Use valve seat cutters (1) to make three cuts as illustrated in figure. Three cutters must be used: the 1st for making
15° angle, the 2nd for making 60° angle, and 3rd for making 45° angle. The 3rd cut (45°) must be made to produce desired seat width.
Seat width for intake valve seat 1.1 - 1.3 mm (0.0433 - 0.0512 inch)