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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Engine Controls - On-Vehicle Adjustments) >> Engine Mechanical >> Valve Clearance >> GS430, LS430, Lx470 & SC430

GS430, LS430, Lx470 & SC430

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Lexus SC 430, 2002 Lexus RX 300, 2002 Lexus LX 470, 2002 Lexus LS 430, and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove intake manifold cover located on top of engine. Drain cooling system if any coolant hoses must be disconnected for access to valve covers. Remove air cleaner assembly (if necessary) and all necessary air intake hoses for access to valve covers.
  2. On LX470, remove bolts/nuts and upper timing belt cover from front of each cylinder head at each camshaft. On all models, disconnect electrical connector at each ignition coil. Remove bolts and ignition coils from valve covers. Disconnect necessary hoses, hose brackets and engine wiring brackets for access to valve covers. Remove bolts, seal washers, valve covers and gaskets.
  3. Rotate crankshaft pulley 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 front cylinder on left side of engine when viewed from flywheel end of engine. See Fig 1-Fig 2 .
    Fig 1: Identifying Valve Clearance Inspection Sequence (LX470, GS430 & LS430)
    G98G11201Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Identifying Valve Clearance Inspection Sequence (SC430)
    G00131785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. On GS430, LS430 and SC430, ensure timing marks on back of camshaft sprockets are aligned. See Fig 3. On LX470, ensure timing marks on camshaft sprockets are aligned with timing marks on timing belt rear plate. See Fig 4. On all models, 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.
    Fig 3: Aligning Timing Marks (GS430, LS430 & SC430)
    G99H50408Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Aligning Timing Marks (LX470)
    G98H11202Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. On GS430, LS430 and LX470, use feeler gauge and measure valve clearance between valve lifter and camshaft on intake valves on cylinders No. 1, 2, 5, 7 and 8, and exhaust valves on cylinders No. 1, 4 and 8. Perform STEP 1. See Fig 1. Record valve clearance. Rotate crankshaft pulley clockwise one full revolution (360 degrees). Using feeler gauge, measure valve clearance between valve lifter and camshaft on intake valves on cylinders No. 3, 4 and 6, and exhaust valves on cylinders No. 2, 3, 5, 6 and 7. Perform STEP 2. See Fig 1. Record valve clearance.
  6. On SC430, use feeler gauge and measure valve clearance between valve lifter and camshaft on intake valves on cylinders No. 1, 2, 5 and 7, and exhaust valves on cylinders No. 1, 3, 4 and 8. Perform STEP 1. See Fig 2. Record valve clearance. Rotate crankshaft pulley clockwise one full revolution (360 degrees). Using feeler gauge, measure valve clearance between valve lifter and camshaft on intake valves on cylinders No. 3, 4, 6 and 8, and exhaust valves on cylinders No. 2, 5, 6 and 7. Perform STEP 2. See Fig 2. Record valve clearance.
  7. On all models, ensure valve clearance is within specification. See VALVE CLEARANCE SPECIFICATIONS (GS430, LS430, LX470 & SC430)  table.
    VALVE CLEARANCE SPECIFICATIONS (GS430, LS430, LX470 & SC430)

    Application (1) In. (mm)
    Intake .006-.010 (.15-.25)
    Exhaust .010-.014 (.25-.35)
    (1) Adjust valve clearance with engine cold.
  8. If valve clearance adjustment is required, adjusting shim between valve lifter and valve stem must be changed. To remove valve lifter, remove timing belt and camshafts. See CAMSHAFT under REMOVAL & INSTALLATION in appropriate ENGINES article.
  9. Remove valve lifter and adjusting shim from valve. Using micrometer, measure thickness of adjusting shim removed. Using measured clearance and adjusting shim thickness, determine correct thickness of adjusting shim to be used. See Fig 5-Fig 6 . Install adjusting shim, valve lifter, camshafts and timing belt. Recheck valve clearance.
  10. If spark plug tube gasket in valve cover requires replacement, bend gasket retaining tabs upward. Pry spark plug tube gasket from valve cover. Use care not to scratch valve cover sealing surface.
  11. Using hammer and proper sized bushing driver, tap spark plug tube gasket into valve cover until spark plug tube gasket is even with valve cover surface. Bend retaining tabs downward. Coat spark plug tube gasket sealing area with grease.
  12. Before installing valve covers and gaskets, apply sealant at specified areas on cylinder head. See Fig 7. Install gasket, valve cover, seal washers and valve cover bolts. Install and tighten valve cover bolts to specification in several steps. See TORQUE SPECIFICATIONS .
  13. To install remaining components, reverse removal procedure. Tighten bolts/nuts to specification. See TORQUE SPECIFICATIONS . Refill cooling system if drained.
Fig 5: Intake Valve Adjusting Shim Selection Chart (GS430, LS430, LX470 & SC430)
G98J11204Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 6: Exhaust Valve Adjusting Shim Selection Chart (GS430, LS430, LX470 & SC430)
G98I11203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 7: Identifying Valve Cover Sealant Application Areas (LX470 Shown; GS430, LS430 & SC430 Are Similar)
G98A11205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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