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Home >> Toyota >> 1996 >> Supra 3.0 D, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Performance Adjustments >> Valve Clearance

Valve Clearance

  1. Check valve clearance with engine cold. Remove necessary components to access valve covers. Remove upper timing belt cover, valve covers and gaskets.
    CAUTION: Ensure crankshaft is always rotated clockwise.
  2. Rotate crankshaft pulley clockwise so crankshaft pulley groove aligns with "0" mark on timing belt cover and cylinder No. 1 (front cylinder) is at TDC on compression stroke. Ensure timing marks on camshaft sprockets are aligned with timing marks on timing belt cover. See Fig 1. If timing marks are not aligned, rotate crankshaft pulley clockwise one full revolution (360 degrees).
  3. Using feeler gauge, measure and record valve clearance of intake valves on cylinders No. 1, 2 and 4, and exhaust valves on cylinders No. 1, 3 and 5. See Fig 5.
    Fig 1: Aligning Camshaft Sprocket Timing Marks
    G93G78242Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Identifying Cylinder Numbers & Valve Arrangement
    G93H78243Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Rotate crankshaft pulley clockwise one full revolution (360 degrees) and realign crankshaft pulley groove with "0" mark on timing belt cover. Using feeler gauge, measure and record valve clearance of intake valves on cylinders No. 3, 5 and 6, and exhaust valves on cylinders No. 2, 4 and 6. See Fig 5.
  5. Ensure valve clearance is within specification. See VALVE CLEARANCE SPECIFICATIONS  table.
    VALVE CLEARANCE SPECIFICATIONS

    Application (1) In. (mm)
    Intake .006-.010 (.15-.25)
    Exhaust .010-.014 (.25-.35)
    (1) Adjust valve clearance with engine cold.
  6. If valve clearance adjustment is required, rotate crankshaft pulley so camshaft lobe is facing upward on valve to be adjusted. Rotate valve lifter so notch area on valve lifter is at 90-degree angle to camshaft. This will place notch area perpendicular to camshaft.
  7. Valve Clearance Adjuster (SST 09248-55040) is used for adjusting valve clearance. Press valve lifter downward using SST "A" of valve clearance adjuster. See Fig 3. Install SST "B" between camshaft and valve lifter. Remove SST "A".
    Fig 3: Removing & Installing Typical Valve Clearance Adjusting Shim
    G94G44236Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. Using small screwdriver and magnet, remove adjusting shim. Using micrometer, measure thickness of removed adjusting shim. Using measured clearance and adjusting shim thickness, determine correct thickness of adjusting shim to be used. See Fig 4 and Fig 5.
  9. Install proper 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.
  10. Apply sealant at front camshaft bearing cap-to-cylinder head surfaces where valve cover gasket seals. Install valve covers using NEW gaskets. Install upper timing belt cover.
Fig 4: Intake Valve Adjusting Shim Selection Chart
G96G09517Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 5: Exhaust Valve Adjusting Shim Selection Chart
G96I09518Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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