Valve Seat

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

Valve seat width W: 

Intake: 

Standard: 

1.0 mm (0.039 in) 

Exhaust: 

Standard: 

1.5 mm (0.059 in) 

Fig 1: Identifying Valve Seat Width

Courtesy of SUBARU OF AMERICA, INC.