Content .. 354 355 356 357 ..

Mazda CX-9 Grand Touring. Manual - part 356

1. Remove the engine cover in the order indicated in the figure.

2. Install in the reverse order of removal.

Fig. 12: View Of Engine Cover Side
Courtesy of MAZDA MOTORS CORP.

VALVE CLEARANCE INSPECTION/ADJUSTMENT [MZI-3.7]

VALVE CLEARANCE INSPECTION

1. Disconnect the negative battery cable.

2. Remove the engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [MZI-3.7].)

3. Remove the ventilation hose.

4. Remove the resonance chamber. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZI-

3.7] .)

5. Remove the dynamic chamber and throttle body as a single unit. (See INTAKE-AIR SYSTEM

REMOVAL/INSTALLATION [MZI-3.7] .)

6. Disconnect the wiring harness.

7. Remove the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION [MZI-3.7] .)

8. Remove the dipstick.

9. Remove the cylinder head cover. (See TIMING CHAIN REMOVAL/INSTALLATION [MZI-3.7].)

NOTE:



Firmly pull the engine cover near the locations shown to disengage
the retainers.

2008 Mazda CX-9 Grand Touring

2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:01:57 AM

Page 11

10. Remove the front wheel and tire (RH). (See GENERAL PROCEDURES (SUSPENSION) .)

11. Remove the splash shield (RH).

12. Measure the valve clearance.

1. Rotate the crankshaft clockwise and verify that the timing mark of the intake side camshaft

sprocket is in the position shown in the figure. In this position, the No.1 cylinder is at the TDC of
the compression stroke.

2. Measure the valve clearance of location A shown in the figure.



If it is not within the specification, replace the tappet and adjust the valve clearance to the
median value of the standard.

Fig. 13: Identifying Valve Clearance Gap
Courtesy of MAZDA MOTORS CORP.

Standard valve clearance [Engine cold]

IN: 0.150-0.250 mm {0.00591-0.00984 in}

EX: 0.300-0.400 mm {0.0119-0.0157 in}

NOTE:



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

2008 Mazda CX-9 Grand Touring

2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:01:57 AM

Page 12

3. Mark the crank pulley and engine front cover as shown in the figure.

4. Rotate the crankshaft clockwise 360 ° so that the No.5 cylinder is at TDC of the compression

stroke.

5. Measure the valve clearance of location B shown in the figure.



If it is not within the specification, replace the tappet and adjust the valve clearance to the
median value of the standard.

Fig. 15: Locating Crank Pulley Mark
Courtesy of MAZDA MOTORS CORP.

Standard valve clearance [Engine cold]

IN: 0.150-0.250 mm {0.00591-0.00984 in}

Fig. 14: Identifying Engine Front Side
Courtesy of MAZDA MOTORS CORP.

2008 Mazda CX-9 Grand Touring

2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:01:57 AM

Page 13

EX: 0.300-0.400 mm {0.0119-0.0157 in}

13. Install in the reverse order of removal.

VALVE CLEARANCE ADJUSTMENT

1. Follow the cylinder head gasket replacement procedure and remove the camshafts and camshaft sprocket

as a single unit. (See CYLINDER HEAD GASKET REPLACEMENT [MZI-3.7].)

2. Remove the tappet.

3. Install an appropriate tappet based on the results of the valve clearance inspection.

Selected tappet = Removed tappet thickness + Measured valve clearance - Standard valve clearance

Standard valve clearance [Engine cold]

IN: 0.150-0.250 mm {0.00591-0.00984 in}

EX: 0.300-0.400 mm {0.0119-0.0157 in}

4. Install in the reverse order of removal.

VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [MZI-3.7]

NOTE:



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

WARNING:



Fuel vapor is hazardous. It can very easily ignite, causing serious
injury and damage. Always keep sparks and flames away from fuel.



Fuel line spills and leakage are dangerous. Fuel can ignite and cause
serious injures or death and damage. Fuel can also irritate skin and
eyes. To prevent this, always complete the "Fuel Line Safety
Procedure". (See BEFORE SERVICE PRECAUTION [MZI-3.7] .)



Continuous exposure to USED engine oil has caused skin cancer in
laboratory mice. Protect your skin by washing with soap and water
immediately after working with engine oil.

CAUTION:



The variable valve timing actuator cannot be disassembled because
it is a precision unit.

NOTE:



The following procedure "VARIABLE VALVE TIMING ACTUATOR
REMOVAL/INSTALLATION" is performed after the engine and transaxle
component is removed from the vehicle. (See ENGINE
REMOVAL/INSTALLATION [MZI-3.7].)

2008 Mazda CX-9 Grand Touring

2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:01:57 AM

Page 14

Content .. 354 355 356 357 ..