LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 1998 >> Avalon XLS >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Performance Adjustments - V6 & V8 >> Valve Clearance >> V6 Valve Clearance >> Tacoma, T100 & 4Runner

Tacoma, T100 & 4Runner

  1. Air intake chamber and intake air connector must be removed for access to valve covers. See Fig 1.
  2. Disconnect negative battery cable. Drain cooling system. Remove air cleaner hose along with upper cap on air cleaner and mass airflow meter. Disconnect necessary electrical connectors, control cables, vacuum hoses and coolant hoses for removal of air intake chamber with throttle body.
  3. On models with EGR, remove nuts, EGR pipe and gaskets. On all models, remove bolts and air intake chamber support brace from air intake chamber. Remove bolts/nuts, air intake chamber and gasket.
  4. Disconnect necessary electrical connectors, ground straps, hoses and wiring brackets for removal of intake air connector. Remove bolts/nuts, intake air connector and gasket.
  5. Disconnect necessary electrical connectors and wiring clamps for removal of engine wiring harness assembly for access to the valve covers. Remove bolts and ignition coils with spark plug wires from valve covers. Remove bolts, seal washers, valve covers and gaskets.
  6. Rotate crankshaft clockwise (viewed from front of engine) so cylinder No. 1 is at TDC on compression stroke. Cylinder No. 1 is the front cylinder on right side of engine when viewed from flywheel end of engine. See Fig 2.
  7. Ensure timing mark on crankshaft pulley aligns with "0" mark on lower timing belt cover. Ensure the one dot timing marks on camshaft gears are aligned. See Fig 3. If timing marks are not aligned, rotate crankshaft clockwise one full revolution (360 degrees).
  8. Using feeler gauge, measure 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. Record valve clearance.
    Fig 1: Exploded View Of Typical Air Intake Chamber & Components (Tacoma, T100 & 4Runner)
    G97B08025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Identifying Cylinder Numbers & Valve Arrangement (Tacoma, T100 & 4Runner)
    G96I18612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 3: Aligning Timing Marks On Camshaft Gears (Tacoma, T100 & 4Runner)
    G97A08020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. Rotate crankshaft clockwise an additional 2/3 turn (240 degrees). Measure 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. Record valve clearance.
  10. Rotate crankshaft clockwise an additional 2/3 turn (240 degrees). Measure 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. Record valve clearance.
  11. Ensure valve clearance is within specification. See VALVE CLEARANCE SPECIFICATIONS (TACOMA , T100 & 4RUNNER) table.
    VALVE CLEARANCE SPECIFICATIONS (TACOMA, T100 & 4RUNNER)

    Application (1) In. (mm)
    Intake Valve .006-.009 (.15-.23)
    Exhaust Valve .011-.014 (.29-.35)
    (1) Adjust valve clearance with engine cold.
  12. 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.
  13. 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 4.
  14. Place SST "B" between camshaft and valve lifter with the side marked with a "7" or "9" in the proper location, depending on valve and cylinder application. See Fig 4. Remove SST "A".
  15. 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 5 and Fig 6.
  16. Install replacement adjusting shim with imprinted number on adjusting shim facing downward, toward the valve lifter. Recheck valve clearance. Before installing valve covers and gaskets, apply sealant at front and rear areas on cylinder head. See Fig 7.
  17. 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.
  18. 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.
  19. 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 using NEW gaskets. Tighten bolts/nuts to specification. See TORQUE SPECIFICATIONS . Fill cooling system.
Fig 4: Removing & Installing Valve Clearance Adjusting Shim (Tacoma, T100 & 4Runner)
G97A08336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 5: Intake Valve Adjusting Shim Selection Chart (Tacoma, T100 & 4Runner)
G96A09519Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 6: Exhaust Valve Adjusting Shim Selection Chart (Tacoma, T100 & 4Runner)
G96C09520Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 7: Identifying Valve Cover Sealant Application Areas (Tacoma, T100 & 4Runner)
G96A18614Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals