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Home >> Toyota >> 1998 >> Avalon XLS >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Performance Adjustments - V6 & V8 >> Valve Clearance >> V6 Valve Clearance >> Avalon, Camry & Sienna

Avalon, Camry & Sienna

  1. On Sienna, remove caps, windshield wiper arm nuts and windshield wiper arms. Remove top seal from cowl top panel. See Fig 1. Remove cowl top panel cap.
  2. Remove clip and disconnect hose for each washer nozzle. Remove driver's side and passenger's side ventilation louvers. See Fig 1. Remove bolts from cowl top panel. Disconnect electrical connect or for windshield wiper motor. Remove cowl top panel.
    Fig 1: Locating Cowl Top Panel & Components (Sienna)
    G98D01398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. On all models, remove passenger's side front fender apron for access to crankshaft pulley. Drain cooling system. Remove intake manifold cover. See Fig 2.
  4. Air intake chamber must be removed for removal of valve covers. Note spark plug wire routing. Disconnect spark plug wires at spark plugs. Remove air cleaner cap assembly and air filter.
  5. Disconnect necessary electrical connections, control cables, coolant hoses, ground cables and vacuum hoses for removal of air intake chamber. See Fig 2. Remove data link connector from end of air intake chamber (if equipped).
    Fig 2: Exploded View Of Typical Air Intake Chamber & Components (Avalon, Camry & Sienna)
    G98B01397Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. Remove nuts and disconnect power steering pressure tube from No. 1 engine hanger. Remove bolts, No. 1 engine hanger and air intake chamber support brace bolt. See Fig 2. Remove nuts, EGR pipe and gaskets (if equipped).
  7. Remove bolts/nuts, air intake chamber and gasket. Disconnect electrical connector at ignition coils. Mark ignition coil location for installation reference. Remove bolts and ignition coils. Disconnect upper radiator hose from coolant outlet at front of engine, between the cylinder heads.
  8. Disconnect electrical connectors for removal of wiring assemblies located above valve covers. Remove bolts and wiring assemblies. Remove bolts, valve covers and gaskets.
  9. Rotate crankshaft pulley clockwise (viewed from front of engine) so crankshaft pulley groove aligns with "0" mark on timing belt cover and cylinder No. 1 is at TDC on compression stroke. Cylinder No. 1 is front cylinder on right side of engine when viewed from flywheel end of engine. See Fig 3.
  10. Ensure cylinder No. 1 intake and exhaust valve lifters are loose. If valve lifters are not as described, rotate crankshaft clockwise one full revolution (360 degrees) and realign crankshaft pulley groove with "0" mark on timing belt cover.
  11. Using feeler gauge, measure valve clearance between valve lifter and camshaft on intake valves on cylinders No. 1 and 6, and exhaust valves on cylinders No. 2 and 3. Perform STEP 1. See Fig 3. Record valve clearance.
  12. Rotate the crankshaft pulley clockwise an additional 240 degrees (2/3 revolution). Measure valve clearance of intake valves on cylinders No. 2 and 3, and exhaust valves on cylinders No. 4 and 5. Perform STEP 2. See Fig 3. Record valve clearance.
  13. Rotate the crankshaft pulley clockwise an additional 240 degrees (2/3 revolution). Measure valve clearance of intake valves on cylinders No. 4 and 5, and exhaust valves on cylinders No. 1 and 6. Perform STEP 3. See Fig 3. Record valve clearance.
    Fig 3: Valve & Cylinder Arrangement (Avalon, Camry & Sienna) Id
    G94I46316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. Ensure valve clearance is within specification. See VALVE CLEARANCE SPECIFICATIONS (AVALON , CAMRY & SIENNA) table.
    VALVE CLEARANCE SPECIFICATIONS (AVALON, CAMRY & SIENNA)

    Application (1) In. (mm)
    Intake .006-.010 (.15-.25)
    Exhaust .010-.014 (.25-.35)
    (1) Adjust valve clearance with engine cold.
  15. If valve clearance adjustment is required, rotate crankshaft pulley so camshaft lobe on valve to be adjusted is facing upward, away from valve lifter. Rotate valve lifter so notch area on valve lifter is at 90-degree angle to camshaft. This will place notch area perpendicular to camshaft.
  16. Valve Clearance Adjuster (SST 09248-55040) is used to remove adjusting shim. Using SST "A" of valve clearance adjuster, press valve lifter downward. See Fig 4. Install SST "B" between camshaft and valve lifter with side marked with "7" or "9" in the proper location, depending on cylinder application. See Fig 4. Side marked with "7" should be used on front valves on No. 1 and 2 cylinders only. Remove SST "A".
  17. Using small screwdriver and magnet, remove adjusting shim. Using micrometer, measure and record thickness of removed adjusting shim. Using measured clearance and adjusting shim thickness, determine correct thickness of adjusting shim to be used. See Fig 6 and Fig 7.
  18. Install replacement adjusting shim with imprinted numbers on adjusting shim facing downward, toward valve lifter. Using SST "A", press downward on valve lifter and remove SST "B". Recheck valve clearance. Before installing valve covers and gaskets, apply sealant at specified areas on cylinder head. See Fig 5.
  19. If spark plug tube gasket in valve cover requires replacement, bend gasket retaining tab upward. Push spark plug tube gasket from valve cover. Use care not to scratch valve cover sealing surface.
  20. Using 32-mm socket and hammer, tap spark plug tube gasket into valve cover until spark plug tube gasket is even with valve cover surface. Bend retaining tab downward. Coat spark plug tube gasket sealing area with grease.
  21. Using NEW gasket, install valve cover. Install and tighten valve cover bolts to specification. See TORQUE SPECIFICATIONS . To install remaining components, reverse removal procedure using NEW gaskets. Tighten bolts/nuts to specification. See TORQUE SPECIFICATIONS . Fill cooling system.
Fig 4: Removing & Installing Valve Clearance Adjusting Shim (Avalon, Camry & Sienna)
G94J46317Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 5: Identifying Cylinder Head Sealant Application Areas (Avalon, Camry & Sienna)
G94I46324Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 6: Intake Valve Adjusting Shim Selection Chart (Avalon, Camry & Sienna)
G96G09517Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 7: Exhaust Valve Adjusting Shim Selection Chart (Avalon, Camry & Sienna)
G96I09518Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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