Valve Seat

WARNING: This page is about a different variant/trim than selected.

Inspect the intake and exhaust valve seats of cylinder head, 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:

Intake

Standard

0.8 - 1.6 mm (0.031 - 0.063 in)

Exhaust

Standard

1.1 - 1.7 mm (0.043 - 0.067 in)

Fig 1: Identifying Contacting Width Between Valve And Valve Seat

Courtesy of SUBARU OF AMERICA, INC.

Fig 2: Creating Gap Between Valve Seat Correcting Surface

Courtesy of SUBARU OF AMERICA, INC.