Mazda Engine SKYACTIV-G 2.5. Manual — part 15

MECHANICAL

01-10–44

(2) Tighten lower cylinder block installation bolts

A in the order shown in the figure using the

following procedure:

Tightening procedure

Step 1: 38—42 N·m {3.9—4.2 kgf·m, 29—30

ft·lbf}

Step 2: Loosen all the bolts (until bolts are

torque-free).

Step 3: 30—34 N·m {3.1—3.4 kgf·m, 23—25

ft·lbf}

Step 4: 57.5—62.5°

(3) Tighten the lower cylinder block installation

bolts B in the order shown in the figure.

Tightening torque

19—25 N·m {2.0—2.5 kgf·m, 15—18 ft·lbf}

6. After verifying that silicone sealant protrudes to

the rear oil seal press-in part, wipe away the

excess silicone sealant.

• If silicone sealant does not protrude to the

rear oil seal press-in part, remove the lower

cylinder block and apply silicone sealant

again.

Piston Pin Assembly Note

1. Apply clean engine oil to the piston pin.

2. Insert the piston pin to the piston and connecting rod.

Note

• When assembling the piston to the connecting rod, each one can be assembled in either direction.

Snap Ring Assembly Note

Caution

• Do not compress the outer diameter of the snap ring more than necessary when assembling the

snap ring (20.66 mm {0.8134 in} or less).

1. Insert a new snap ring using a thin plier.

3

7

10

6

2

4

8

9

5

1

ENGINE
FRONT

A

A

A

A

A

A

A

A

A

A

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8

9

5

1

3

7

10

6

2

4

B

B

B

B

B

B

B

B

B

B

ENGINE
FRONT

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MECHANICAL

01-10–45

01-10

Piston Ring Assembly Note

Note

• It is not required to position the end gap between the top ring and second ring.

1. Assemble the oil ring so that the end gap of each

oil ring rail does not overlap as shown in the

figure.

2. Assemble so that the identification paint marks on

the top and second rings are visible to the right

side of each end gap.

Note

• If there are no identification paint marks on

the top and second rings, place the ring with

the bigger inner circumference at the top as

shown in the figure.

30

°

30

°

PISTON PIN AXIS

LOWER OIL RING RAIL

UPPER OIL RING RAIL

OIL RING SPACER

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TOP RING

END GAP

IDENTIFICATION PAINT MARK

SECOND RING

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TOP RING

NOTCH

NOTCH

SECOND RING

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MECHANICAL

01-10–46

Connecting Rod Bearing Assembly Note

Caution

• If a connecting rod bearing is reused, assemble it to the same position and in the direction as

before removal to prevent engine damage due to seizure or burning of the bearing.

• To prevent engine damage due to seizure or burning of the bearing, apply engine oil to the sliding

part when assembling.

1. Apply engine oil to the connecting rod bearings.

2. Align the positioning tab of the connecting rod

bearing with the positioning groove of the

connecting rod and connecting rod cap, and

assemble the bearings.

Piston, Connecting Rod Assembly Note

1. Insert the piston into the cylinder with the mark on

top of the piston facing the intake side.

INSTALLED

CONNECTING ROD
BEARING

CONNECTING ROD CAP

TAB

GROOVE

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6TN

G

2

ENGINE
FRONT

EX

IN

MARKED

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MECHANICAL

01-10–47

01-10

Connecting Rod Cap Assembly Note

Caution

• When assembling the connecting rod caps, align the broken, rough faces of the connecting rods

and connecting rod caps.

• If the following condition is met, replace the connecting rod cap bolts.

—

Length exceeds maximum

specification

Standard connecting rod cap bolt length

43.7—44.3 mm {1.73—1.74 in}

Maximum connecting rod cap bolt length

45.0 mm {1.77 in}

1. Position so that the broken, rough faces of the

connecting rods and connecting rod caps are

aligned exactly, and assemble the connecting rod

caps.

2. Tighten the connecting rod cap bolts in the

following two steps.

Tightening procedure

Step 1: 26—32 N·m {2.7—3.2 kgf·m, 20—23 ft·lbf}

Step 2: 80—100°

Pilot Bearing Assembly Note

1. Install new pilot bearing to the specified position

using the following tools.

Tool

Snap-on brand millimeter size bushing

driver set (A160M) adapter A160M7 (20—

22 mm {0.79—0.86 in})

• Use the adapter with the 20 mm {0.79 in}

side of the A160M7 (20—22 mm {0.79—

0.86 in}) facing the pilot bearing side.

Substitution tool

Outer diameter: 21 mm {0.83 in}

Inner diameter: 19 mm {0.75 in}

Standard pilot bearing position

Distance A of pilot bearing from crankshaft

end: 1.5—2.5 mm {0.060—0.098 in}

End Of Sie

L

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PILOT BEARING

A

CRANKSHAFT

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