Mazda 3 Service Manual: Valve Clearance Inspection [Mzr 2.0, Mzr 2.5]

1. Remove the battery cover..

2. Disconnect the negative battery cable..

3. Remove the plug hole plate..

4. Disconnect the wiring harness.

5. Remove the ignition coils..

6. Remove the spark plugs..

7. Remove the ventilation hose.

8. Remove the oil level gauge.

9. Remove the cylinder head cover..

10. Remove the aerodynamic under cover No.2 and splash shield as a single unit..

11. Measure the valve clearance.

NOTE:

• Make sure to note down the measured values for choosing the suitable replacement tappets.

a. Turn the crankshaft clockwise so that the No.1 piston is at top dead center (TDC) of the compression stroke.

b. Measure the valve clearance at A in the figure.

Valve clearance for inspection [Engine cold]

• IN: 0.22—0.30 mm {0.009—0.011 in}

• EX: 0.27—0.37 mm {0.011—0.014 in}

c. If the valve clearance is out of the standard value, adjust it..

d. Turn the crankshaft 360°

clockwise so that the No.4 piston is at TDC of the compression stroke.

e. Measure the valve clearance at B in the figure.

Valve clearance for inspection [Engine cold]

• IN: 0.22—0.30 mm {0.009—0.011 in}

• EX: 0.27—0.37 mm {0.011—0.014 in}

f. If the valve clearance is out of the standard value, adjust it..

12. Install in the reverse order of removal.