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Mazda CX 7. Manual - part 100

MECHANICAL [L3 WITH TC]

01-10–3

01-10

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WM: DRIVE BELT

DRIVE BELT INSPECTION[L3 WITH TC]

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Note

• Drive belt deflection/tension inspection is not necessary because of the use of the drive belt auto

tensioner.

1. Verify that the drive belt auto tensioner indicator mark does not exceed the limit.

• If it exceeds the limit, replace the drive belt.

(See01-10-3 DRIVE BELT REMOVAL/
INSTALLATION[L3 WITH TC].)

End Of Sie

DRIVE BELT REMOVAL/INSTALLATION[L3 WITH TC]

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1. Remove the splash shield (RH).
2. Rotate the drive belt auto tensioner in the

direction shown in the figure and remove the drive
belt.

3. Install the drive belt.
4. Verify that the drive belt auto tensioner indicator

mark does not exceed the limit. (See01-10-3
DRIVE BELT INSPECTION[L3 WITH TC].)

5. Install the splash shield (RH).

End Of Sie

WM: DRIVE BELT AUTO TENSIONER

NORMAL

MALFUNCTION

INDICATOR
MARK

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MECHANICAL [L3 WITH TC]

01-10–4

DRIVE BELT AUTO TENSIONER INSPECTION[L3 WITH TC]

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1. Remove the drive belt. (See01-10-3 DRIVE BELT REMOVAL/INSTALLATION[L3 WITH TC].)
2. Verify that the drive belt auto tensioner moves

smoothly in the operational direction.

• Replace the drive belt auto tensioner if

necessary.

3. Rotate the drive belt auto tensioner pulley by

hand and verify that it rotates smoothly.

• Replace the drive belt auto tensioner if

necessary.

4. Install the drive belt. (See01-10-3 DRIVE BELT

REMOVAL/INSTALLATION[L3 WITH TC].)

End Of Sie

WM: ENGINE COMPLETE

VALVE CLEARANCE INSPECTION/ADJUSTMENT[L3 WITH TC]

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Valve Clearance Inspection

1. Disconnect the negative battery cable.
2. Remove the splash shield (RH).
3. Remove the charge air cooler. (See01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH TC].)
4. Remove the high pressure fuel pump. (See01-14-16 HIGH PRESSURE FUEL PUMP REMOVAL/

INSTALLATION[L3 WITH TC].)

5. Remove the ignition coils. (See01-18-2 IGNITION COIL REMOVAL/INSTALLATION[L3 WITH TC].)
6. Disconnect the wiring harness.
7. Remove the ventilation hose.
8. Remove the cylinder head cover. (See01-10-10 TIMING CHAIN REMOVAL/INSTALLATION[L3 WITH TC].)
9. Measure the valve clearance.

(1) Rotate the crankshaft clockwise so that the No.1 cylinder is at TDC of the compression stroke.
(2) Measure the valve clearance of location A

shown in the figure.

Standard valve clearance [Engine cold]

IN: 0.22— 0.28 mm {0.0087— 0.011 in}
EX: 0.27— 0.33 mm {0.011— 0.012 in}

(3) If it is not within the specification, replace the

tappet and adjust the valve clearance to the
median value of the standard.

Note

• Make sure to note down the measured

values for choosing the suitable replacement
tappets.

(4) Rotate the crankshaft clockwise 360

° so that the No.4 cylinder is at TDC of the compression stroke.

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

Standard valve clearance [Engine cold]

IN: 0.22— 0.28 mm {0.0087— 0.011 in}
EX: 0.27— 0.33 mm {0.011— 0.012 in}

(6) If not within the specification, replace the tappet and adjust the valve clearance to the median value of the

standard.

10. Install the cylinder head cover. (See01-10-10 TIMING CHAIN REMOVAL/INSTALLATION[L3 WITH TC].)
11. Install the ventilation hose.
12. Connect the wiring harness.
13. Install the ignition coils. (See01-18-2 IGNITION COIL REMOVAL/INSTALLATION[L3 WITH TC].)
14. Install the high pressure fuel pump. (See01-14-16 HIGH PRESSURE FUEL PUMP REMOVAL/

INSTALLATION[L3 WITH TC].)

15. Install the charge air cooler. (See01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH TC].)
16. Install the splash shield (RH).
17. Connect the negative battery cable.

DRIVE BELT
AUTO TENSIONER

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No.1

No.2

No.3

No.4

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MECHANICAL [L3 WITH TC]

01-10–5

01-10

Valve Clearance Adjustment

INSTALLATION[L3 WITH TC].)

10. Remove the engine front cover lower blind plug.
11. Remove the engine front cover upper blind plug.

12. Remove the cylinder block lower blind plug, and

install the SST.

13. Rotate the crankshaft in the direction of the

engine rotation so that the No.1 piston is at TDC
of the compression stroke. (Until the crank weight
contacts SST and stops.)

14. Release the tension on the timing chain shown in

the figure.

UPPER
BLIND
PLUG

LOWER BLIND
PLUG

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303-507

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BOLT(M6 x 1.0)

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MECHANICAL [L3 WITH TC]

01-10–6

(1) Using a suitable screwdriver or equivalent tool, unlock the chain tensioner ratchet.
(2) Rotate the exhaust camshaft clockwise using a suitable wrench on the cast hexagon and loosen the

tension on the timing chain.

(3) Using a suitable bolt (M6 X 1.0 length

25mm— 35mm {0.99— 1.3 in}) at the engine
front cover upper blind plug, secure the
tensioner arm at the position where the
tension is released.

15. Fix the exhaust camshaft using a wrench on the

cast hexagon, and loosen the camshaft sprocket
installation bolt.

16. Remove the installation bolt and remove the

exhaust camshaft sprocket.

17. Remove the oil control valve (OCV). (See01-10-

29 OIL CONTROL VALVE (OCV) REMOVAL/
INSTALLATION[L3 WITH TC].)

18. Loosen the camshaft cap bolts in two or three

passes in the order shown in the figure and
remove the camshaft cap.

Note

• The camshaft caps are to be kept ordered

for correct reassembly in their original
positions. Do not mix the caps.

19. Remove the camshafts for the intake and exhaust

sides.

20. Remove the tappet.
21. 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: 0.22— 0.28 mm {0.0087— 0.011 in}
EX: 0.27— 0.33 mm {0.011— 0.012 in}

22. Install the camshaft with No.1 cylinder cam aligned at TDC of the compression stroke.

RIB

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EXHAUST
CAMSHAFT
SPROCKET

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No.1

No.2

No.3

No.4

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Content .. 98 99 100 101 ..