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Home >> Isuzu >> 1994 >> Trooper S, Standard >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 3.2L V6 - VINS [V,W] >> Overhaul >> Cylinder Head >> Valve Seat

Valve Seat

  1. To measure valve seat margin, install a NEW valve in cylinder head. Measure from spring seat to tip of valve. Replace valve seats not within specification. See CYLINDER HEAD  table under ENGINE SPECIFICATIONS.
  2. Measure valve seat width. See Fig 1. Cut or replace valve seats to reach required width specification. See CYLINDER HEAD  table under ENGINE SPECIFICATIONS.
    Fig 1: Measuring Valve Seat Width
    G93A01599Courtesy of ISUZU MOTOR CO.
  3. Replace valve seat if damaged. To remove valve seat, arc weld a welding rod to valve seat in several areas to shrink valve seat. Allow valve seat to cool. Gently tap on welding rod to remove valve seat. Ensure valve seat area in cylinder head is clean.
  4. To install valve seat, heat valve seat area of cylinder head with steam. Cool valve seat with dry ice. Install valve seat in cylinder head. Valve seat-to-cylinder head interference fit should be .004-.006" (.11-.15 mm). Grind valve seat to specified seat width. See CYLINDER HEAD  table under ENGINE SPECIFICATIONS.
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