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1.Complete the “BEFORE SERVICE PRECAUTION”. (See BEFORE SERVICE PRECAUTION [MZR-CD 2.2].)

2.Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZR-CD 2.2].)

3.Remove the engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [MZR-CD 2.2].)

4.Disconnect the ventilation hose from the cylinder head cover.

5.Disconnect the following parts and set the fuel injector wiring harness out of the way.

• Fuel injector connector

• Boost sensor connector

• Fuel pressure sensor connector

• EGR cooler bypass valve control solenoid valve connector

• Front harness-short cord connector

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6.Remove the fuel injectors. (See FUEL INJECTOR REMOVAL/INSTALLATION [MZR-CD 2.2].)

7.Remove the insulator and cylinder head cover. (See TIMING CHAIN REMOVAL/INSTALLATION [MZR-CD 2.2].)

8.Remove the front splash shield (RH).

9.Remove the crankshaft pulley cover.

10.Measure the valve clearance using the following procedure.

Caution

• Apply engine oil to the cam after measuring the valve clearance.

(1)Rotate the crankshaft clockwise and align the knock pin to the position shown in the figure. In this position, the No.1 cylinder is at the TDC of the compression stroke.

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(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 [MZR-CD 2.2].)

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Standard valve clearance [Engine cold]

IN : 0.07—0.17 mm {0.003—0.006 in}

EX : 0.12—0.22 mm {0.0048—0.0086 in}

(3)Turn the crankshaft 360° clockwise so that the No.4 cylinder 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 [MZR-CD 2.2].)

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Standard valve clearance [Engine cold]

IN : 0.07—0.17 mm {0.003—0.006 in}

EX : 0.12—0.22 mm {0.0048—0.0086 in}

11.Install in the reverse order of removal.

12.Complete the “AFTER SERVICE PRECAUTION”. (See AFTER SERVICE PRECAUTION [MZR-CD 2.2].)