Valve Seat

Inspect the intake and exhaust valve seats, and then correct the contact surfaces with valve seat cutter if they are defective or when valve guides are replaced.

1. Valve seat width: W 

Intake 

1. Standard 1.0 mm (0.039 in) 
2. Limit 1.7 mm (0.067 in) 

Exhaust 

1. Standard 1.5 mm (0.059 in) 
2. Limit 2.2 mm (0.087 in) 

Fig 1: Identifying Valve Seat Width

Courtesy of SUBARU OF AMERICA, INC.