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Home >> Mazda >> 1997 >> 626 ES, Standard >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 2.5L V6 >> Overhaul >> Cylinder Head >> Valve Guides

Valve Guides

  1. Ensure valve guide inside diameter and installed height are within specification. Measure inside diameter at top, center and bottom in 2 positions. See CYLINDER HEAD  under ENGINE SPECIFICATIONS. Replace valve guide if inside diameter exceeds specification or valve guide installed height is not within specification.
    NOTE: Measure valve guide installed height from top of valve guide to cylinder head surface.
  2. To replace valve guide, using hammer and Valve Guide Remover (49-B012-005), drive valve guide toward camshaft side of cylinder head. To install, assemble Valve Guide Installer components (49-L012-004), (49-L012-003) and (49-L012-002).
  3. Adjust valve guide installer so depth is set at specified distance for proper valve guide application. See Fig 1. Adjust depth to .579-.602" (14.70-15.30 mm) for intake valve guide, or .480-.504" (12.20-12.80 mm) for exhaust valve guides.
    Fig 1: Adjusting Valve Guide Installer
    G93G02455Courtesy of MAZDA MOTORS CORP.
  4. Using hammer and valve guide installer, drive valve guide in from camshaft side of cylinder head until valve guide installer contacts cylinder head.
  5. Ensure valve guide installed height is within specification. See CYLINDER HEAD  under ENGINE SPECIFICATIONS. If valve guide installed height is not within specification, readjust depth on valve guide installer and adjust valve guide installed height.
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