Mazda Engine SKYACTIV-G 2.5. Manual - part 7

MECHANICAL 

01-10–12

5. Insert a wire with an 

approx. diameter of 1.5 mm 

{0.059 in} or a paper clip where the link plate hole 

and the tensioner body hole overlap to secure the 

link plate and lock the plunger.

6. Remove the chain tensioner.

Oil Pump Chain Disassembly Note

1. Hold the crankshaft using the 

SST.

2. Slightly loosen the balancer shaft sprocket and oil 

pump driven sprocket installation bolts.

Note

• At this stage, only loosen the installation 

bolts, do not remove them. Remove the bolts 

after removing the oil pump chain tensioner.

3. Set a cloth wrapped flathead screwdriver in the 

gap between the oil pump drive sprocket and the 

oil pump chain as shown in the figure.

WIRE OR 
PAPER CLIP

TENSIONER BODY HOLE

LINK PLATE

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49 E011 1A0

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OIL PUMP CHAIN TENSIONER

OIL PUMP CHAIN

OIL PUMP DRIVE 
SPROCKET

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MECHANICAL 

01-10–13

01-10

4. Move the screwdriver in the direction of the arrow and press the oil pump chain, and then press on the plunger 

of the oil pump chain tensioner.

5. Insert a wire with an approx. diameter of 1.4 mm 

{0.055 in} or a paper clip into the body hole of the 

oil pump chain tensioner with the plunger 

pressed.

Note

• The wire or paper clip secures the plunger, 

and the tension can be released.

6. Remove the oil pump chain tensioner.

7. Remove the oil pump chain and balancer shaft 

sprocket as a single unit.

8. Remove the oil pump driven sprocket.

End Of Sie

OIL PUMP CHAIN TENSIONER

OIL PUMP CHAIN

BEFORE PRESSING

AFTER PRESSING

OIL PUMP CHAIN TENSIONER

OIL PUMP CHAIN TENSIONER

PLUNGER

OIL PUMP DRIVE 
SPROCKET

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WIRE OR 
PAPER CLIP

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MECHANICAL 

01-10–14

CYLINDER HEAD DISASSEMBLY (I)

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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}.

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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MECHANICAL 

01-10–15

01-10

1. Disassemble in the order indicated in the table.

.

2

1

3

4

6

R

R

WATER 
PUMP

R

7

8

9

WITH OIL COOLER

WITHOUT OIL COOLER

5

10

8

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1

Electric variable valve timing actuator, hydraulic 

variable valve timing actuator

(See 01-10-16 Electric Variable Valve Timing 

Actuator, Hydraulic Variable Valve Timing Actuator 

Disassembly Note.)

2

OCV

3

Camshaft cap

(See 01-10-16 Camshaft Cap Disassembly Note.)

4

Camshaft

5

OCV oil filter

6

Rocker arm

(See 01-10-16 Rocker Arm Disassembly Note.)

7

HLA

(See 01-10-16 HLA Disassembly Note.)

8

Water inlet pipe

9

Cylinder head

(See 01-10-16 Cylinder Head Disassembly Note.)

10

Cylinder head gasket