Valve Seat

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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.

Contacting width W between valve and valve seat:

Standard

Intake

0.6 - 1.4 mm (0.024 - 0.055 in)

Exhaust

1.2 - 1.8 mm (0.047 - 0.071 in)

Fig 1: Identifying Width Between Valve And Valve Seat

Courtesy of SUBARU OF AMERICA, INC.

Fig 2: Inspecting Intake And Exhaust Valve Seats For Defects

Courtesy of SUBARU OF AMERICA, INC.