Outer Diameter of Valve Lifter

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

Measure the outer diameter of the valve lifter.
Valve lifter outer diameter :33.965 - 33.980 mm (1.3372 - 1.3378 in)
If out of the specified range, replace the valve lifter.

Fig 1: Checking Outer Diameter of Valve Lifter
Courtesy of NISSAN MOTOR CO., U.S.A.