Mazda 6. Manual - part 102

B–1

B

B

ENGINE

LOCATION INDEX ................................................. B-2

MECHANICAL LOCATION INDEX ...................... B-2

DRIVE BELT ........................................................... B-3

DRIVE BELT INSPECTION ................................. B-3
DRIVE BELT REPLACEMENT ............................ B-3
DRIVE BELT AUTO TENSIONER 
INSPECTION ....................................................... B-4

VALVE CLEARANCE............................................. B-4

VALVE CLEARANCE INSPECTION.................... B-4
VALVE CLEARANCE ADJUSTMENT ................. B-5

COMPRESSION PRESSURE ................................ B-9

COMPRESSION INSPECTION ........................... B-9

TIMING CHAIN ..................................................... B-10

TIMING CHAIN REMOVAL/INSTALLATION ..... B-10

CYLINDER HEAD GASKET................................. B-18

CYLINDER HEAD GASKET REPLACEMENT .. B-18

FRONT OIL SEAL ................................................ B-21

FRONT OIL SEAL REPLACEMENT.................. B-21

REAR OIL SEAL .................................................. B-25

REAR OIL SEAL REPLACEMENT .................... B-25

ENGINE ................................................................ B-26

ENGINE REMOVAL/INSTALLATION ................ B-26
ENGINE DISASSEMBLY/ASSEMBLY............... B-31

VARIABLE VALVE TIMING ................................. B-32

VARIABLE VALVE TIMING ACTUATOR 

INSPECTION .................................................. B-32

VARIABLE VALVE TIMING ACTUATOR 

REMOVAL/INSTALLATION ............................ B-32

OIL CONTROL VALVE (OCV) ............................. B-33

OIL CONTROL VALVE (OCV) 

REMOVAL/INSTALLATION ............................ B-33

OIL CONTROL VALVE (OCV) INSPECTION .... B-33

B–2

LOCATION INDEX 

MECHANICAL LOCATION INDEX

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.

LOCATION INDEX

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1

Drive  belt
(See 

B–3 DRIVE BELT INSPECTION

)

(See 

B–3 DRIVE BELT REPLACEMENT

)

(See 

B–4 DRIVE BELT AUTO TENSIONER 

INSPECTION

)

2

Tappet
(See 

B–4 VALVE CLEARANCE INSPECTION

)

3

Engine
(See 

B–9 COMPRESSION INSPECTION

)

(See 

B–26 ENGINE REMOVAL/INSTALLATION

)

(See 

B–31 ENGINE DISASSEMBLY/ASSEMBLY

)

4

Timing Chain
(See 

B–10 TIMING CHAIN REMOVAL/

INSTALLATION

)

5

Cylinder head gasket
(See 

B–18 CYLINDER HEAD GASKET 

REPLACEMENT

)

6

Front oil seal
(See 

B–21 FRONT OIL SEAL REPLACEMENT

)

7

Rear oil seal
(See 

B–25 REAR OIL SEAL REPLACEMENT

)

8

Oil control valve (OCV) (L3)
(See 

B–33 OIL CONTROL VALVE (OCV) 

REMOVAL/INSTALLATION

)

(See 

B–33 OIL CONTROL VALVE (OCV) 

INSPECTION

)

9

Variable valve timing actuator (L3)
(See 

B–32 VARIABLE VALVE TIMING ACTUATOR 

REMOVAL/INSTALLATION

)

(See 

B–32 VARIABLE VALVE TIMING ACTUATOR 

INSPECTION

)

10

Plug hole plate
(See 

G–10 SPARK PLUG REMOVAL/

INSTALLATION

)

DRIVE BELT 

B–3

B

End Of Sie

DRIVE BELT INSPECTION

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Note

• Front and water pump drive belt deflection/tension inspection is not necessary because of the use of the 

front drive belt auto tensioner.

Front Drive Belt

1. Verify that the drive belt auto tensioner indicator 

mark does not exceeds the limit.

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

(See

B–3 DRIVE BELT REPLACEMENT

.)

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DRIVE BELT REPLACEMENT

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1. Remove the splash shield (RH).
2. Turn the center of the tensioner pulley clockwise 

to release tension to the drive belt.

3. Remove the drive belt.
4. Reinstall the drive belt or install a new drive belt.
5. Verify that the drive belt auto tensioner indicator 

mark does not exceeds the limit. (See 

B–3 DRIVE 

BELT INSPECTION

.)

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

6. Install the splash shield (RH).

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DRIVE BELT

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B–4

DRIVE BELT, VALVE CLEARANCE 

DRIVE BELT AUTO TENSIONER INSPECTION

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1. Remove the drive belt. (See 

B–3 DRIVE BELT REPLACEMENT

.)

2. Verify that the drive belt auto tensioner moves 

smoothly in the operational direction.

• Replace the drive belt auto tensioner if 

necessary.

3. Turn 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. (See 

B–3 DRIVE BELT 

REPLACEMENT

.)

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VALVE CLEARANCE INSPECTION

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1. Disconnect the negative battery cable.
2. Remove the tire (RH).
3. Remove the splash shield (RH).
4. Remove the spark plugs. (See 

G–10 SPARK PLUG REMOVAL/INSTALLATION

.)

5. Remove the oil control valve (OCV) connector.
6. Remove the ventilation hose.
7. Remove the cylinder head cover. 
8. Verify that the engine is in cold condition.
9. Measure the valve clearance.

(1) Turn the crankshaft clockwise so that the No.1 piston is at TDC of the compression stroke.
(2) Measure the valve clearance at A in the 

figure.

• If the valve clearance exceeds the space 

the tappet. (See 

B–5 VALVE 

CLEARANCE ADJUSTMENT

.)

Note

• Make sure to note the measured values for 

choosing the suitable replacement tappets.

Standard [Engine cold]

IN: 0.22—0.28 mm {0.0087—0.0110 in} 

(0.25

±0.03 mm {0.0098±0.0011 in})

EX: 0.27—0.33 mm {0.0106—0.0130 in} 

(0.30

±0.03 mm {0.0118±0.0011 in})

(3) Turn the crankshaft 360

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

(4) Measure the valve clearance at B in the figure.

• If the valve clearance exceeds the standard, replace the tappet. (See 

B–5 VALVE CLEARANCE 

ADJUSTMENT

.)

Note

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

Standard [Engine cold]

IN: 0.22—0.28 mm {0.0087—0.0110 in} (0.25

±0.03 mm {0.0098±0.0011 in})

EX: 0.27—0.33 mm {0.0106—0.0130 in} (0.30

±0.03 mm {0.0118±0.0011 in})

10. Install the cylinder head cover. (See 

B–17 Cylinder Head Cover Installation Note

.)

11. Install the ventilation hose.
12. Install the oil control valve connector.
13. Install the high-tension lead. (See 

G–10–1 HIGH-TENSION LEAD REMOVAL/INSTALLATION

.)

14. Install the spark plugs. (See 

G–10 SPARK PLUG REMOVAL/INSTALLATION

.)

15. Install the splash shield (RH).

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VALVE CLEARANCE

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