Mazda Engine SKYACTIV-G 2.5. Manual — part 22

MECHANICAL

01-10–72

2. Install the timing chain while aligning the marks on each sprocket and the timing chain as shown in the figure.

3. Install the tensioner arm.

4. Install the chain tensioner.

5. After installing the chain tensioner, remove the installed wire or paper clip, and then apply tension to the timing

chain.

• If a new chain tensioner is used, remove the

installed stopper.

6. Install the chain guide (No.1).

7. Verify that there is no looseness in the timing

chain, and re-verify that each sprocket is in the

specified location.

TIMING CHAIN
ALIGNMENT MARK
(YELLOW)

CRANKSHAFT SPROCKET
TIMING CHAIN
ALIGNMENT MARK

PIN

TIMING MARK

TIMING CHAIN
ALIGNMENT MARK
(ORANGE)

HYDRAULIC VARIABLE VALVE TIMING
ACTUATOR TIMING CHAIN ALIGNMENT MARK

CYLINDER
HEAD
UPPER
SURFACE

bpe1ze00000075

STOPPER

LINK PLATE

am3uuw00008861

MECHANICAL

01-10–73

01-10

8. Rotate the crankshaft clockwise two turns and inspect the valve timing.

Note

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

CYLINDER
HEAD
UPPER
SURFACE

KEY

PIN

TIMING MARK

bpe5ue00000010

MECHANICAL

01-10–74

Engine Front Cover Assembly Note

Note

• For a new engine front cover, the positioning

pins in the two locations shown in the figure

project to the outside of the engine.

1. If the engine front cover is newly replaced, tap the

positioning pins in the two locations to the seal

surface side.

2. Completely clean and remove any oil, dirt, sealant

or other foreign matter that may be adhering to

the engine front cover, cylinder head, and cylinder

block.

3. When reusing the engine front cover installation

bolts, clean any old sealant from the bolts.

Caution

• Apply the silicon sealant in a single,

unbroken line.

• To prevent silicone sealant from

hardening, adhere the engine front cover

to the cylinder block within 10 min. after

silicone sealant is applied. Tighten the

installation bolts completely soon after

adhering.

• Using bolts with the old seal adhering

could cause cracks in the cylinder head

and cylinder block.

POSITIONING PIN

A

VIEW FROM A

SEAL SIDE

ENGINE OUTSIDE

POSITIONING
PIN

bpe1ze00000006

WOOD SLAB

0—1 mm
{0—0.03 in}

POSITIONING PIN

SEAL SIDE

ENGINE OUTSIDE

POSITIONING
PIN

bpe1ze00000007

OLD SEALANT

DAMAGE

bpe1ze00000008

MECHANICAL

01-10–75

01-10

4. Apply silicone sealant to the engine front cover as shown in the figure.

Bead thickness

A: 2—6 mm {0.1—0.2 in}

B: 4—6 mm {0.16—0.23 in}

C: 4—8 mm {0.2—0.3 in}

A

mm {in}

SEALANT

SEALANT

90

°

10 {0.39}

SECTION D-D

0.5

—

1.5 mm

{0.02

—

0.05 in}

SEALANT

SEALANT

ENGINE FRONT
COVER

A

10 {0.39}

10 {0.39}

10 {0.39}

10 {0.39}

10 {0.39}

32.5 {1.28}

10 {0.39}

B

C

B

B

C

B

B

C

B

B

C

B

bpe1ze00000078