Valve Seat

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

Valve seat width: W 

Intake (A) 

Standard 0.8 - 1.4 mm (0.0315 - 0.055 in) 

Limit 1.8 mm (0.071 in) 

Exhaust (B) 

Standard 1.2 - 1.8 mm (0.047 - 0.071 in) 

Limit 2.2 mm (0.087 in) 

Fig 1: Identifying Seat Guide Dimension

Courtesy of SUBARU OF AMERICA, INC.

Fig 2: Inspecting Intake And Exhaust Valve Seats

Courtesy of SUBARU OF AMERICA, INC.