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Home >> Chevrolet >> 1988 >> Spectrum Base, 2D Hatchback, Standard >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 1.5L 4-CYL - VIN [7] & 1.5L 4-CYL Turbo - VIN [9] >> Removal & Installation >> Valve Seats Service

Valve Seats Service

  1. Check valve depression into cylinder head. Valve depression should be less than .0197" (.500 mm) for intake valves and zero for exhaust valves. Replace seat or cylinder head as necessary. Measure valve seat contact width. Regrind or replace seat if contact surface width is not within specification or contact surface is damaged or rough.
  2. To replace seat, arc weld rod to valve seat at several points. Allow rod to cool for a few minutes. This will cause valve seat to shrink. Remove valve seat from head. Clean seat area in cylinder head.
  3. Heat cylinder head with steam. Cool valve seat insert with dry ice. Press valve seat into cylinder head. After installing seat, machine to specification. Lap seat and valve.
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