Valve Guide Clearance

Perform this inspection before removing the valve guide.

1. Make sure that the valve stem diameter is within the specification.
2. Push the valve out by approximately 15 mm (0.59 in) toward the combustion chamber side to measure the valve's run-out volume (in the direction of dial gauge) with dial gauge.
3. Half of the run-out volume accounts for the valve guide clearance.

   Intake valve guide clearance : 0.020 - 0.053 mm (0.0008 - 0.0021 in) or less 

   Exhaust valve guide clearance : 0.030 - 0.063 mm (0.0012 - 0.0025 in) or less 

   Fig 1: Checking Cylinder Head Distortion

   Courtesy of NISSAN MOTOR CO., U.S.A.