Valve Clearance Inspection

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable.
Remove the tire (RH).
Remove the splash shield (RH).
Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
Remove the spark plugs.
Remove the Oil Control Valve (OCV) connector.
Remove the ventilation hose.
Remove the cylinder head cover.
Verify that the engine is in cold condition.
Measure the valve clearance.
1. Turn the crankshaft clockwise so that the No.1 piston is at TDC of the compression stroke.
2. Measure the valve clearance at A in the figure.
  - If the valve clearance is out of the standard value, adjust it. (See VALVE CLEARANCE ADJUSTMENT .)
    
    Fig 1: Identifying Valves A & B
    Courtesy of MAZDA MOTORS CORP.
  NOTE:
  - Make sure to note down the measured values for choosing the suitable replacement tappets.
  Standard [Engine cold]
  1. IN: 0.22-0.28 mm {0.0087-0.0110 in}
  2. EX: 0.27-0.33 mm {0.0107-0.0129 in}
3. Rotate the crankshaft 360° clockwise so that the No.4 piston is at TDC of the compression stroke.
4. Measure the valve clearance at B in the figure.
  - If the valve clearance is out of the standard value, adjust it. (See VALVE CLEARANCE ADJUSTMENT .)
  NOTE:
  - Make sure to note down the measured values for choosing the suitable replacement tappets.
  Standard [Engine cold]
  1. IN: 0.22-0.28 mm {0.0087-0.0110 in}
  2. EX: 0.27-0.33 mm {0.0107-0.0129 in}
Install the cylinder head cover. (See CYLINDER HEAD COVER INSTALLATION NOTE .)
Install the ventilation hose.
Install the Oil Control Valve (OCV) connector.
Install the high-tension lead. See HIGH-TENSION LEAD REMOVAL/INSTALLATION .
Install the spark plugs.
Install the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
Install the splash shield (RH).
Install the tire (RH).