Valve Guide Clearance

WARNING: This page is about a different car, the 2004 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

Measure valve deflection as shown in figure. (Valve and valve guide wear the most in this direction.)
1. Valve deflection limit (dial gauge reading)
  1. Intake & Exhaust : 0.2 mm (0.008 in)
Fig 1: Measuring Valve Deflection
Courtesy of NISSAN MOTOR CO., U.S.A.
If it exceeds the limit, check valve to valve guide clearance.

Fig 2: Measuring Valve Stem Diameter And Valve Guide Inner Diameter
Courtesy of NISSAN MOTOR CO., U.S.A.
1. Measure valve stem diameter and valve guide inner diameter.
2. Calculate valve to valve guide clearance. Valve stem to valve guide clearance = valve guide inner diameter - valve stem diameter.
3. Check that clearance is within specification.
  
  Fig 3: Valve Guide Clearance Specification Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
  - If it exceeds the limit, replace valve and renames clearance.
  - If limit is still exceeded after replacing valve, replace valve guide.