Valve Guide Replacement

When valve guide is removed, replace with oversized [0.2 mm (0.008 in)] valve guide.

1. To remove valve guide, heat cylinder head to 110° to 130°C (230° to 266°F) by soaking in heated oil.
   Fig 1: Heating Cylinder Head

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Drive out the valve guide with a press [under a 20 kN (2.2 US ton) pressure] or hammer and suitable tool.
   Fig 2: Driving Out Valve Guide

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Ream cylinder head valve guide hole.
   1. Valve guide hole diameter : 10.175 - 10.196 mm (for service parts), intake (0.4006 - 0.4014 in) and exhaust 
   Fig 3: Reaming Cylinder Head Valve Guide Hole

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Heat cylinder head to 110° to 130°C (230° to 266°F) by soaking in heated oil and press new valve guide from camshaft side into the cylinder head to the dimensions as shown.
   1. Projection "L" : 12.6 - 12.8 mm (0.496 - 0.504 in) 
   Fig 4: Identifying Projection "L"

   Courtesy of NISSAN MOTOR CO., U.S.A.
5. Using a valve guide reamer, apply a reamer finish to the valve guide.
   1. Intake and exhaust finished size: 6.000 - 6.018 mm (0.2362 - 0.2369 in) 
   Fig 5: Reaming Valve Guide

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