Mazda Engine SKYACTIV-G 2.5. Manual - part 18

MECHANICAL 

01-10–56

Valve Seal Assembly Note

1. Press on the valve seal to the valve guide using 

the 

SST by hand.

Valve seal identification color

IN: GREEN

EX: GRAY

Valve Spring Assembly Note

Caution

• The valve springs differ depending on IN 

and EX sides. Therefore, verify the free 

length or identification paint beforehand 

and assemble the valve springs correctly.

1. Assemble the valve spring with the small diameter 

side of the valve spring facing upward.

VALVE SEAL

49 B012 016

49 B012 016

9.52 mm 
{0.375 in}

VALVE SEAL

3.5 mm 
{0.14 in}

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IN

EX

PURPLE 
PAINT

NOT 
PAINTE

50.07 mm {1.971 in}

48.96 mm {1.928 in}

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MECHANICAL 

01-10–57

01-10

Valve Keeper Assembly Note

1. Install the valve keeper using the 

SST.

Water Outlet Assembly Note

1. Install the water outlet gasket with the bead of the 

gasket facing the direction shown in the figure.

2. Temporarily tighten the water outlet installation 

bolts.

49 0636 100B

49 B012 0A2A

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B

SECTION B-B

BEAD

CYLINDER HEAD

WATER OUTLET

WATER OUTLET 
GASKET

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MECHANICAL 

01-10–58

3. Tighten bolt A of the 5 bolts shown in the figure to 

the specified torque first.

Tightening torque

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

Note

• The tightening order for the remaining 3 

bolts is optional.

Thermostat Assembly Note

1. Install the thermostat with the jiggle pin aligned 

with the notch of the water outlet.

End Of Sie

BOLT

A

A

BOLT

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THERMOSTAT

WATER OUTLET

NOTCH

JIGGLE-PIN

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MECHANICAL 

01-10–59

01-10

CYLINDER HEAD ASSEMBLY (II)

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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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