Valve Seat Contact

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

After confirming that the dimensions of valve guides and valves are within specifications, perform this procedure.

Courtesy of NISSAN NORTH AMERICA, INC.

Apply prussian blue onto contacting surface of valve seat to check the condition of the valve contact on the surface.

Check if the contact area band is continuous all around the circumference.

If not, grind to adjust valve fitting and check again. If the contacting surface still has NG conditions even after the re-check, replace valve seat.