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Tacoma, Tundra & 4Runner

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  1. Air intake chamber and intake air connector must be removed for access to valve covers. See Fig 1.
  2. Drain cooling system. Remove air cleaner hose along with upper cap on air cleaner and mass airflow meter. Remove air cleaner case assembly (if necessary). Disconnect necessary electrical connectors, control cables, vacuum hoses and coolant hoses for removal of air intake chamber with throttle body.
  3. 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 retaining 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 crankshaft pulley timing mark (groove) aligns with "0" mark on lower timing belt cover and 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 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) and realign crankshaft pulley timing mark (groove) with "0" mark on lower timing belt cover.
  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 in illustration. See Fig 2. Record valve clearance.
    Fig 1: Exploded View Of Typical Air Intake Chamber & Components (Tacoma, Tundra V6 & 4Runner)
    G97B08025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Identifying Cylinder Numbers & Valve Arrangement (Tacoma, Tundra V6 & 4Runner)
    G96I18612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 3: Aligning Timing Marks On Camshaft Gears (Tacoma, Tundra V6 & 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 in illustration. 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 in illustration. See Fig 2. Record valve clearance.
  11. Ensure valve clearance is within specification. See VALVE CLEARANCE SPECIFICATIONS (TACOMA, TUNDRA V6 & 4RUNNER)  table.
    VALVE CLEARANCE SPECIFICATIONS (TACOMA, TUNDRA V6 & 4RUNNER)

    Application (1) In. (mm)
    Intake Valve .006-.009 (.15-.23)
    Exhaust Valve .011-.014 (.29-.35)
    (1) Adjust valve clearance with engine cold. Verify valve clearance listed with valve clearance listed on underhood label (if available). If valve clearance on underhood label differs from valve clearance listed, use specification on underhood label.
  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.
    Fig 4: Removing & Installing Valve Clearance Adjusting Shim (Tacoma, Tundra V6 & 4Runner)
    G99F08032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. Install 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. It may be necessary to install SST "B" at a slight angle from intake side of engine to prevent it from getting stuck on adjusting shim. Remove SST "A".
  15. 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 for proper valve by using the follow equation, or using adjusting shim selection charts. For intake valves, "N" (new adjusting shim thickness) = "T" (used adjusting shim thickness) + "A" (measured clearance) minus .007" (.18 mm). For exhaust valves, "N" (new adjusting shim thickness) = "T" (used adjusting shim thickness) + "A" (measured clearance) minus .013" (.32 mm). Adjusting shims are available in 17 sizes ranging from .0984" (2.500 mm) to .1299" (3.300 mm) in increments of .0020" (.050 mm). For adjusting shim selection charts, see Fig 6 and Fig 7 .
  16. Install replacement adjusting shim with imprinted number on adjusting shim facing downward, toward valve lifter. Using SST "A", press downward on valve lifter and remove SST "B". Recheck valve clearance.
  17. Before installing valve covers and gaskets, apply sealant at specified areas on cylinder head. See Fig 5. Install gasket and 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 5: Identifying Valve Cover Sealant Application Areas (Tacoma, Tundra V6 & 4Runner)
    G96A18614Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Intake Valve Adjusting Shim Selection Chart (Tacoma, Tundra V6 & 4Runner)
    G96A09519Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 7: Exhaust Valve Adjusting Shim Selection Chart (Tacoma, Tundra V6 & 4Runner)
    G96C09520Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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