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Home >> Toyota >> 1998 >> Avalon XLS >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Engine Mechanical (3.0L V6) >> Adjustments >> Valve Clearance Adjustment

Valve Clearance Adjustment

NOTE: Adjust valve clearance with engine cold.
WARNING: To prevent air bag deployment, disconnect negative battery cable at least 90 seconds before working on vehicle.
  1. Disconnect negative battery cable. Drain cooling system. On Sienna, remove outer cowl top panel assembly, including wiper arms and ventilator louver. See Fig 1. Remove right fender apron seal.
    Fig 1: Removing Outer Cowl Top Panel Assembly (Sienna)
    G98D01398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. On all models, disconnect control cables from throttle body (if necessary). Disconnect upper radiator hose at coolant outlet housing. Remove air cleaner cap and airflow meter with air intake hose. Remove nuts and intake manifold cover located above intake manifold.
  3. Disconnect necessary electrical connections and vacuum hoses from vacuum switching valve assembly located above intake manifold. Remove nuts and vacuum switching valve assembly.
    NOTE: Vacuum switching valve assembly may be referred to as emission control valve set.
  4. Disconnect necessary electrical connections, coolant hoses and vacuum hoses for removal of air intake chamber located above valve cover. Remove No. 1 engine hanger, air intake chamber support, and EGR pipe as necessary.
  5. Remove bolts/nuts, air intake chamber and gasket. Disconnect electrical connectors for removal of wiring assemblies located above valve covers. Remove bolts and wiring assemblies.
  6. Remove bolts and ignition coil assemblies. Mark ignition coil installation location for reassembly reference. Remove spark plugs. Remove bolts, valve covers and gaskets. Rotate crankshaft clockwise (viewed from front of engine) so cylinder No. 1 is at TDC on compression stroke. Cylinder No. 1 is front cylinder on right side when viewed from rear of engine. See Fig 2.
  7. Ensure timing mark on crankshaft pulley aligns with "0" mark on timing belt cover. Ensure intake and exhaust valve lifters on cylinder No. 1 are loose. If conditions are not as described, rotate crankshaft clockwise one complete revolution.
  8. Using feeler gauge, measure and record valve clearance between valve lifter and camshaft on intake valves of cylinders No. 1 and 6 and exhaust valves on cylinders No. 2 and 3. Perform STEP 1. See Fig 2.
    Fig 2: Identifying Valve & Cylinder Arrangement
    G94I46316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. Rotate crankshaft clockwise an additional 2/3 turn (240 degrees). Measure and record valve clearance between valve lifter and camshaft on intake valves of cylinders No. 2 and 3 and exhaust valves on cylinders No. 4 and 5. Perform STEP 2. See Fig 2.
  10. Rotate crankshaft clockwise an additional 2/3 turn (240 degrees). Measure and record valve clearance between valve lifter and camshaft on intake valves of cylinders No. 4 and 5 and exhaust valves on cylinders No. 1 and 6. Perform STEP 3. See Fig 2. Ensure valve clearance is within specification. See VALVE CLEARANCE SPECIFICATIONS .
    VALVE CLEARANCE SPECIFICATIONS (1)

    Application In. (mm)
    Exhaust Valve .010-.014 (.25-.35)
    Intake Valve .006-.010 (.15-.25)
    (1) Adjust valve clearance with engine cold.
  11. If valve clearance requires adjustment, rotate camshaft so lobe on valve to be adjusted is facing upward, away from valve lifter. Position notch on valve lifter perpendicular to the camshaft. Ensure notch is not aligned with the camshaft.
  12. Valve Clearance Adjuster (SST 09248-55040) is used to remove adjusting shim. Using SST "A" of valve clearance adjuster, push downward on valve lifter. See Fig 3. Place SST "B" between camshaft and valve lifter with the side marked with a "7" or "9" in the right location, depending on cylinder application. Side marked with "7" should be used on front valves on No. 1 and 2 cylinders only. Remove SST "A".
  13. Using small screwdriver and magnet, remove adjusting shim. Measure and record thickness of removed adjusting shim. Using measured clearance and adjusting shim thickness, select proper replacement adjusting shim. See Fig 4 and Fig 5 .
  14. Install replacement adjusting shim with imprinted number on adjusting shim facing the valve lifter. Recheck valve clearance. Before installing valve cover and gasket, apply sealant at front and rear areas of cylinder head. See Fig 6.
  15. Using NEW gasket, install valve cover. Install and tighten valve cover bolts to specification in several steps. See TORQUE SPECIFICATIONS . To install remaining components, reverse removal procedure. Use NEW gaskets. Tighten all fasteners to specification. Fill cooling system and adjust control cables (if necessary).
Fig 3: Adjusting Valve Clearance
G94J46317Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: Exhaust Valve Adjusting Shim Selection Chart
G96I09518Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 5: Intake Valve Adjusting Shim Selection Chart
G96G09517Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 6: Identifying Cylinder Head Sealant Application Areas
G94I46324Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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