Mazda Engine SKYACTIV-G 2.5. Manual - part 21

MECHANICAL 

01-10–68

1. Assemble in the order indicated in the table.

.

A

A

SST

SST

15—20 
{1.6—2.0, 
12—14}

8.0—9.0 N·m 
{82—91 kgf·m, 
71—79 ft·lbf}

9—12 N·m 
{92—122 kgf·m, 
80—106 ft·lbf}

R

4.5—7.0 N·m 
{46—71 kgf·m, 
40—61 ft·lbf}

SST

R

SEALANT

SEALANT

SST

OIL

OIL

20—26 
{2.1—2.6, 
15—19}

90—110 
{9.2—11, 
67—81} 
+55—65

°

R

R

*1

SEALANT

SEALANT

SEALANT

SEALANT

SEALANT

SEALANT

*1

*1

*1

*1

*1: 8—11 N·m {82—112 kgf·m, 71—97 ft·lbf}

*1

SEALANT

SEALANT

N·m {kgf·m, ft·lbf}

*1

20—30 
{2.1—3.0, 
15—22}

38—46 {3.9—4.6, 29—33}

19

18

1

2

3

4

5

6

7

8

9

10

14

15

17

24

23

21

22

16

11

20

13

12

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1

Key

2

Oil pump drive sprocket

3

Oil pump chain guide

4

Oil pump driven sprocket

(See 01-10-69 Oil Pump Chain Assembly Note.)

MECHANICAL 

01-10–69

01-10

Oil Pump Chain Assembly Note

1. Verify that the key and knock pin are aligned to 

the positions shown in the figure.

• If they are not in the positions shown in the 

figure, rotate the crankshaft and balancer 

shaft (No.1) to set cylinder No.1 to top dead 

center (TDC).

2. Temporarily assemble the oil pump driven 

sprocket.

3. Temporarily tighten the oil pump driven sprocket 

installation bolt.

4. Align the oil pump chain alignment mark with the 

balancer shaft sprocket alignment mark.

5

Oil  pump  chain

(See 01-10-69 Oil Pump Chain Assembly Note.)

6

Balancer shaft sprocket

(See 01-10-69 Oil Pump Chain Assembly Note.)

7

Oil pump chain tensioner

(See 01-10-69 Oil Pump Chain Assembly Note.)

8

Crankshaft sprocket

9

Chain guide (No.2)

10 Timing chain

(See 01-10-71 Timing Chain Assembly Note.)

11 Chain guide (No.1)

(See 01-10-71 Timing Chain Assembly Note.)

12 Tensioner arm

(See 01-10-71 Timing Chain Assembly Note.)

13 Chain tensioner

(See 01-10-71 Timing Chain Assembly Note.)

14 Engine front cover

(See 01-10-74 Engine Front Cover Assembly Note.)

15 Oil pan

(See 01-10-77 Oil Pan Assembly Note.)

16 Electric variable valve timing motor/driver

(See 01-10-79 Electric Variable Valve Timing Motor/

Driver Assembly Note.)

17 Front oil seal

(See 01-10-80 Front Oil Seal Assembly Note.)

18 Crankshaft pulley
19 Crankshaft pulley lock bolt

(See 01-10-80 Crankshaft Pulley Lock Bolt Assembly 

Note.)

20 Water pump pulley

(See 01-10-81 Water Pump Pulley Assembly Note.)

21 Spark plug
22 Oil shower pipe

(See 01-10-81 Oil Shower Pipe Assembly Note.)

23 Cylinder head cover

(See 01-10-82 Cylinder Head Cover Assembly Note.)

24 Dipstick

KEY

KNOCK PIN

BALANCER SHAFT 
(NO.1)

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OIL PUMP CHAIN 
ALIGNMENT 
MARK (ORANGE)

BALANCER SHAFT 
SPROCKET 
ALIGNMENT MARK

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MECHANICAL 

01-10–70

5. Install the oil pump chain and balancer shaft sprocket as a single unit while aligning the alignment marks on 

each sprocket and oil pump chain as shown in the figure.

6. Temporarily tighten the balancer shaft sprocket installation bolt.

7. Install the oil pump chain tensioner.

Caution

• At this stage, do not remove the wire or paper clip installed to the oil pump chain tensioner.

8. Hold the crankshaft using the 

SST.

9. Tighten the oil pump driven sprocket installation 

bolt.

Tightening torque

20—30 N·m {2.1—3.0 kgf·m, 15—22 ft·lbf}

10. Tighten the balancer shaft sprocket installation 

bolt.

Tightening torque

38—46 N·m {3.9—4.6 kgf·m, 29—33 ft·lbf}

11. Remove the wire or paper clip installed to the oil 

pump chain tensioner and apply tension to the oil pump chain.

• If a new oil pump chain tensioner is used, remove the installed stopper.

OIL PUMP DRIVE 
SPROCKET 
ALIGNMENT MARK

KEY

OIL PUMP CHAIN ALIGNMENT 
MARK (ORANGE)

OIL PUMP CHAIN 
ALIGNMENT 
MARK (YELLOW)

BALANCER SHAFT 
SPROCKET 
ALIGNMENT MARK

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49 E011 1A0

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MECHANICAL 

01-10–71

01-10

Timing Chain Assembly Note

1. Verify that the timing marks and the key are aligned to the position shown in the figure.

Note

• The timing mark of SKYACTIV-G 2.5 is not completely parallel with the upper surface of the cylinder head.

• If they are not in the position shown in the figure, rotate the camshaft and crankshaft to set the cylinder No.1 

top dead center (TDC).

KEY

CYLINDER 
HEAD 
UPPER 
SURFACE

TIMING MARK

TIMING CHAIN ALIGNMENT MARK

PIN

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