Mazda Engine SKYACTIV-G 2.5. Manual — part 20

MECHANICAL

01-10–64

Camshaft Assembly Note

1. As shown in the figure, apply gear oil (SAE No. 90 or equivalent) or engine oil to the center area of each journal

of the cylinder head.

Caution

• Apply 0.05 ml {0.05 cc, 0.003 in

3

} or less of oil to journal No.6.

2. Apply gear oil (SAE No. 90 or equivalent) or engine oil to the following locations of each camshaft.

• Thrust surface of front journal

3. As shown in the figure, align the cam position of

cylinder No.1 around top dead center (TDC) and

place the camshafts on the cylinder head.

OIL

OIL

JOURNAL NO.6

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INTAKE CAMSHAFT

CYLINDER HEAD

EXHAUST CAMSHAFT

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MECHANICAL

01-10–65

01-10

4. As shown in the figure, apply gear oil (SAE No. 90 or equivalent) or engine oil to the center area of each journal

of the camshaft.

5. Apply adhesive agent (Loctite 962T) around

journal No.6 of the cylinder head or the exhaust-

side rear camshaft cap.

Caution

• Verify that there is no adhesive agent on

the journal.

Adhesive agent bead width

0.5—1.5 mm {0.02—0.05 in}

6. Install the camshaft caps in the marked number

order, and temporarily tighten the camshaft cap

installation bolts in two or three passes evenly.

OIL

OIL

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CYLINDER HEAD
AROUND
JOURNAL NO.6

EXHAUST-SIDE REAR
CAMSHAFT CAP

GROOVE

ADHESIVE

ADHESIVE

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MECHANICAL

01-10–66

7. Tighten the camshaft cap installation bolts in two steps in the order shown in the figure.

Tightening torque

Step 1: 3.0—6.0 N·m {31—61 kgf·cm, 27—53 in·lbf}

Step 2: 8—11 N·m {82—112 kgf·cm, 71—97 in·lbf}

Electric Variable Valve Timing Actuator, Hydraulic Variable Valve Timing Actuator Assembly Note

1. Align the knock pin on the end of the camshaft

with the notch on the actuator (intake side) or

knock pin installation hole (exhaust side), then

install the actuator to the camshaft.

E2

E5

E4

E3

I2

I5

I4

I3

4

6

2

1

3

5

MARKED NUMBER

MARKED NUMBER

1

5

2

3

4

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INTAKE
CAMSHAFT

KNOCK PIN

NOTCH

ELECTRIC VARIABLE VALVE
TIMING ACTUATOR

EXHAUST
CAMSHAFT

HYDRAULIC VARIABLE VALVE
TIMING ACTUATOR

KNOCK PIN
INSTALLATION HOLE

KNOCK PIN

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MECHANICAL

01-10–67

01-10

2. Hold the camshaft using a wrench on the cast

hexagon, and tighten the actuator installation bolt.

Tightening torque

Electric variable valve timing actuator

(intake side): 102—114 N·m {10.5—11.6

kgf·m, 76—84 ft·lbf}

Hydraulic variable valve timing actuator

(exhaust side): 75—85 N·m {7.7—8.6 kgf·m,

56—62 ft·lbf}

End Of Sie

TIMING CHAIN ASSEMBLY

id011000505600

Caution

• If the camshaft is rotated with the timing chain removed and the piston at the top dead center

position, the valve may contact the piston and the engine could be damaged. When rotating the

camshaft with the timing chain removed, rotate it after lowering the piston from the top dead

center position.

• When rotating the camshaft using a

wrench on the cast hexagon, the wrench

may contact the rocker arm and damage

the rocker arm. To prevent damage to the

rocker arm when holding the camshaft on

the cast hexagon, use a wrench on the

rear side of the engine as shown in the

figure to secure a clearance between the

cam.

Note

• Width at the cast hexagon of the camshaft is

22—24 mm {0.87—0.94 in}.

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CAMSHAFT

WRENCH

CAST HEXAGON

ROCKER ARM

CONTACT

ENGINE REAR

DOES NOT CONTACT

SECURE CLEARANCE

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22

—

24 mm

{0.87

—

0.94 in}

CAMSHAFT

CAST HEXAGON

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