2008 - MX-5 - Engine

VALVE CLEARANCE INSPECTION [LF]

1. Remove the battery cover.

2. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF].)

3. Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION [LF].)

4. Disconnect the ventilation hose. (See QUICK RELEASE CONNECTOR (EMISSION SYSTEM) REMOVAL/INSTALLATION [LF].)

5. Remove the front suspension tower bar (joint). (See FRONT SUSPENSION TOWER BAR REMOVAL/INSTALLATION.)

6. Remove the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [LF].)

7. Disconnect the OCV connector.

8. Disconnect the P/S pressure switch connector.

9. Remove the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION [LF].)

10. Remove the cylinder head cover. (See TIMING CHAIN REMOVAL/INSTALLATION [LF].)

11. Measure the valve clearance.

a. Turn the crankshaft clockwise so that the No.1 piston is at TDC of the compression stroke.

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

• If the valve clearance is out of the specification, adjust it. (See VALVE CLEARANCE ADJUSTMENT [LF].)

  NOTE:

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

Valve clearance [Engine cold]

• IN: 0.22—0.28 mm {0.0087—0.0110 in}

• EX: 0.27—0.33 mm {0.0107—0.0129 in}

c. Turn the crankshaft 360° clockwise so that the No.4 piston is at TDC of the compression stroke.

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

• If the valve clearance is out of the specification, adjust it. (See VALVE CLEARANCE ADJUSTMENT [LF].)

  NOTE:

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

Valve clearance [Engine cold]

• IN: 0.22—0.28 mm {0.0087—0.0110 in}

• EX: 0.27—0.33 mm {0.0107—0.0129 in}

12. Install the cylinder head cover. (See TIMING CHAIN REMOVAL/INSTALLATION [LF].)

13. Install the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION [LF].)

14. Connect the P/S pressure switch connector.

15. Connect the OCV connector.

16. Install the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [LF].)

17. Install the front suspension tower bar (joint). (See FRONT SUSPENSION TOWER BAR REMOVAL/INSTALLATION.)

18. Connect the ventilation hose. (See QUICK RELEASE CONNECTOR (EMISSION SYSTEM) REMOVAL/INSTALLATION [LF].)

19. Install the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION [LF].)

20. Connect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF].)

21. Install the battery cover.