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Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 570 (Engine Mechanical [Service Information MZI-3.7]) >> Valve Clearance Inspection/Adjustment [MZI-3.7] >> Valve Clearance Inspection

Valve Clearance Inspection

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable.
  2. Remove the engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [MZI-3.7] .)
  3. Remove the ventilation hose.
  4. Remove the dynamic chamber and throttle body as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZI-3.7] .)
  5. Disconnect the wiring harness.
  6. Remove the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION [MZI-3.7] .)
  7. Remove the dipstick.
  8. Remove the cylinder head cover. (See TIMING CHAIN REMOVAL/INSTALLATION [MZI-3.7] .)
  9. Remove the splash shield (RH).
  10. Measure the valve clearance.
    1. Rotate the crankshaft clockwise and verify that the timing mark of the intake side camshaft sprocket is in the position shown in the figure. In this position, the No. 1 cylinder is at the TDC of the compression stroke.
      2. Fig 1: Identifying Timing Mark
      G04969350Courtesy of MAZDA MOTORS CORP.
    2. Measure the valve clearance of location A shown in the figure.
      Fig 2: Identifying Location A & B
      G04969351Courtesy of MAZDA MOTORS CORP.
      • If it is not within the specification, replace the tappet and adjust the valve clearance to the median value of the standard.

        Standard valve clearance [Engine cold] 

        IN: 0.150-0.250 mm {0.00591-0.00984 in} 

        EX: 0.300-0.400 mm {0.0119-0.0157 in} 

        NOTE:
        • Make sure to note down the measured values for choosing the suitable replacement tappets.
    3. Mark the crank pulley and engine front cover as shown in the figure.
      4. Fig 3: Locating Crank Pulley Mark
      G04969352Courtesy of MAZDA MOTORS CORP.
    4. Rotate the crankshaft clockwise 360° so that the No. 5 cylinder is at TDC of the compression stroke.
    5. Measure the valve clearance of location B shown in the figure.
      • If it is not within the specification, replace the tappet and adjust the valve clearance to the median value of the standard.

        Standard valve clearance [Engine cold] 

        IN: 0.150-0.250 mm {0.00591-0.00984 in} 

        EX: 0.300-0.400 mm {0.0119-0.0157 in} 

        NOTE:
        • Make sure to note down the measured values for choosing the suitable replacement tappets.
  11. Install in the reverse order of removal.
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