VALVE CLEARANCE ADJUSTMENT

PROCEDURE


  1. REMOVE INLET NO. 1 AIR CLEANER

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  2. REMOVE AIR CLEANER CAP SUB-ASSEMBLY

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  3. REMOVE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

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  4. REMOVE NO. 1 IGNITION COIL

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  5. SEPARATE DUTY VACUUM SWITCHING VALVE

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  6. SEPARATE ENGINE WIRE

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  7. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY

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  8. REMOVE CYLINDER HEAD COVER GASKET

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  9. SET NO. 1 CYLINDER TO TDC/EXHAUST

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  10. INSPECT VALVE CLEARANCE

    A01VGD1E01
    Text in Illustration
    *a Intake Side
    *b Exhaust Side

    1. Check only the valves indicated.


      1. Using a feeler gauge, measure the clearance between the valve lifter and camshaft.

        Valve clearance (Cold)
        Intake side
        0.145 to 0.235 mm (0.00571 to 0.00925 in.)
        Exhaust side
        0.275 to 0.365 mm (0.01083 to 0.01437 in.)
        Inspectable Valve w/ No. 1 Cylinder at TDC/Exhaust
        Measurement Position No. 1 Cylinder No. 2 Cylinder No. 3 Cylinder
        Intake Side - ○ -
        Exhaust Side - - ○

        Note

        Insert the feeler gauge from the spark plug side (center).

      2. Record any out-of-specification valve clearance measurements. They will be used later to determine the required replacement valve lifters.

    2. Turn the crankshaft 1 revolution (360°).

    3. A01VM7EE01
      Text in Illustration
      *a Intake Side
      *b Exhaust Side

      Check only the valves indicated.


      1. Using a feeler gauge, measure the clearance between the valve lifter and camshaft.

        Valve clearance (Cold)
        Intake side
        0.145 to 0.235 mm (0.00571 to 0.00925 in.)
        Exhaust side
        0.275 to 0.365 mm (0.01083 to 0.01437 in.)
        Inspectable Valve w/ No. 1 Cylinder at TDC
        Measurement Position No. 1 Cylinder No. 2 Cylinder No. 3 Cylinder
        Intake Side ○ - ○
        Exhaust Side ○ ○ -

        Note

        Insert the feeler gauge from the spark plug side (center).

      2. Record any out-of-specification valve clearance measurements. They will be used later to determine the required replacement valve lifters.

  11. ADJUST VALVE CLEARANCE


    1. Remove the camshaft and No. 2 camshaft Click here.

    2. Remove the valve lifters Click here.

    3. A01VJ7J

      Using a micrometer, measure the thickness of the removed valve lifters.

    4. Calculate the thickness of a new valve lifter so that the valve clearance comes within the specified value.

      A Thickness of new lifter
      B Thickness of used lifter
      C Measured valve clearance
      Valve clearance
      Intake A = B + (C - 0.18 mm (0.0071 in.))
      Exhaust A = B + (C - 0.31 mm (0.0122 in.))

      Tech Tips


      • Select a new valve lifter with a thickness as close to the calculated values as possible.

      • Valve lifters are available in 29 sizes in increments of 0.020 mm (0.0008 in.), from 5.12 to 5.68 mm (0.2016 to 0.2236 in.).

      • Refer to the following Valve Lifter Selection Charts.

      A01VFURE01
      Text in Illustration
      *a Valve Lifter Selection Chart (Intake) *b Measured Valve Clearance mm (in.)
      *c Installed Valve Lifter Thickness mm (in.) - -
      A01VIXAE01
      Text in Illustration
      *a Valve Lifter Selection Chart (Exhaust) *b Measured Valve Clearance mm (in.)
      *c Installed Valve Lifter Thickness mm (in.) - -

      Tech Tips

      New Valve lifter Thickness mm (in.)
      Lifter No. Thickness Lifter No. Thickness Lifter No. Thickness
      12 5.12 (0.2016) 32 5.32 (0.2094) 52 5.52 (0.2173)
      14 5.14 (0.2024) 34 5.34 (0.2102) 54 5.54 (0.2181)
      16 5.16 (0.2031) 36 5.36 (0.2110) 56 5.56 (0.2189)
      18 5.18 (0.2039) 38 5.38 (0.2118) 58 5.58 (0.2197)
      20 5.20 (0.2047) 40 5.40 (0.2126) 60 5.60 (0.2205)
      22 5.22 (0.2055) 42 5.42 (0.2134) 62 5.62 (0.2213)
      24 5.24 (0.2063) 44 5.44 (0.2142) 64 5.64 (0.2220)
      26 5.26 (0.2071) 46 5.46 (0.2150) 66 5.66 (0.2228)
      28 5.28 (0.2079) 48 5.48 (0.2157) 68 5.68 (0.2236)
      30 5.30 (0.2087) 50 5.50 (0.2165) - -

    5. Install the valve lifters Click here.

    6. Install the camshaft and No. 2 camshaft Click here.

  12. INSTALL CYLINDER HEAD COVER GASKET

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  13. INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY

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  14. CONNECT ENGINE WIRE

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  15. CONNECT DUTY VACUUM SWITCHING VALVE

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  16. INSTALL NO. 1 IGNITION COIL

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  17. INSTALL AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

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  18. INSTALL AIR CLEANER CAP SUB-ASSEMBLY

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  19. INSTALL INLET NO. 1 AIR CLEANER

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  20. INSPECT FOR OIL LEAK

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