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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.


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