Camshaft Valve Clearance: Inspection

Perform the following inspection after removal, installation or replacement of camshaft or valve-related parts, or if there are unusual engine conditions due to changes in valve clearance over time (starting, idling or noise).

1. Remove rocker cover. Refer to [ROCKER COVER: REMOVAL AND INSTALLATION [QR25DE] ].
2. Remove engine undercover. Refer to [FRONT BUMPER: REMOVAL AND INSTALLATION ].
3. Remove radiator shroud (lower). Refer to [RADIATOR: EXPLODED VIEW ]
4. Measure the valve clearance as follows:
   1. Set No. 1 cylinder at TDC of its compression stroke.
      • Rotate crankshaft pulley clockwise and align TDC mark to timing indicator on front cover.
        Fig 1: Aligning TDC Mark To Timing Indicator On Front Cover

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      • Make sure that intake and exhaust cam noses of No. 1 cylinder are located as shown.
        Fig 2: Locating Intake And Exhaust Cam Noses Of No. 1 Cylinder

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      • If not, rotate crankshaft one revolution (360°) and align as shown.
   2. Use a feeler gauge, measure the clearance between valve lifter and camshaft.
      Fig 3: Measuring Clearance Between Valve Lifter And Camshaft

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      Valve clearance: 

      VALVE CLEARANCE SPECIFICATIONS
      
      

      Unit: mm (in)
      	Cold (1) (reference data)	Hot (2) (reference data)
      Intake	0.24 - 0.32 (0.009 - 0.013)	0.304 - 0.416 (0.012 - 0.016)
      Exhaust	0.26 - 0.34 (0.010 - 0.013)	0.308 - 0.432 (0.012 - 0.017)
      (1) Approximately 20 °C (68 °F) (2) Approximately 80 °C (176 °F)

      • Measure the valve clearances at locations marked "x" as shown in the table below (locations indicated with black arrow shown) with feeler gauge.
        Fig 4: Valve Clearances Measuring Locations

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      • No. 1 cylinder compression TDC
        VALVE CLEARANCES REFERENCE CHART
        
        

        Measuring position		No. 1 CYL.	No. 2 CYL.	No. 3 CYL.	No. 4 CYL.
        No. 1 cylinder at compression TDC	INT	x	x
        	EXH	x		x

   3. Rotate crankshaft one revolution (360°) and align TDC mark to timing indicator on front cover.
      Fig 5: Aligning TDC Mark To Timing Indicator On Front Cover

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      • Measure the valve clearance at locations marked "x" as shown in the table below (locations indicated with black arrow shown) with feeler gauge.
        Fig 6: Valve Clearance Measuring Position

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      • No. 4 cylinder compression TDC
        VALVE CLEARANCES REFERENCE CHART
        
        

        Measuring position		No. 1 CYL.	No. 2 CYL.	No. 3 CYL.	No. 4 CYL.
        No. 4 cylinder at compression TDC	INT			x	x
        	EXH		x		x

5. If out of standard, perform adjustment.