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Home >> Toyota >> 1998 >> Avalon XLS >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Engine Mechanical (3.0L V6) >> Overhaul >> Cylinder Head >> Valve Guides

Valve Guides

  1. Ensure valve guide inside diameter is within specification. See CYLINDER HEAD  under ENGINE SPECIFICATIONS. Replace valve guide if inside diameter exceeds specification.
  2. To replace valve guide, heat cylinder head to 176-212°F (80-100°C). Using hammer and Valve Guide Remover/Installer (SST 09201-01055), drive valve guide from camshaft side of cylinder head.
  3. Measure cylinder head valve guide bore inside diameter. If bore inside diameter is .4053-.4060" (10.295-10.313 mm), use standard valve guide. If bore inside diameter is .4073-.4080" (10.345-10.363 mm), use oversize valve guide.
  4. If bore inside diameter exceeds .4060" (10.313 mm), machine valve guide bore to .4073-.4080" (10.345-10.363 mm) for oversize valve guide. If bore I.D. exceeds .4080" (10.363 mm), replace cylinder head.
    CAUTION: Exhaust valve guide is 1.594" (40.50 mm) long, and intake valve guide is 1.358" (34.50 mm) long. Ensure proper length valve guide is installed.
  5. To install valve guide, heat cylinder head to 176-212°F (80-100°C). Using hammer and valve guide remover/installer, drive valve guide in from camshaft side of cylinder head until valve guide installed height is within specification. See CYLINDER HEAD  under ENGINE SPECIFICATIONS. Valve guide installed height is measured from top of valve guide to cylinder head surface, right next to the valve guide.
  6. Using .216" (5.50 mm) reamer, ream valve guide to obtain specified valve stem-to-guide oil clearance. See CYLINDER HEAD  under ENGINE SPECIFICATIONS.
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