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

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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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