Mazda Engine SKYACTIV-G 2.5. Manual — part 13

MECHANICAL

01-10–36

Standard bearing oil clearance at the large end of the connecting rod

0.026—0.052 mm {0.0011—0.0020 in}

Maximum bearing oil clearance at the large end of the connecting rod

0.10 mm {0.0039 in}

Connecting rod bearing size

STD: 1.502—1.519 mm {0.05914—0.05980 in}

OS 0.25: 1.628—1.631 mm {0.06410—0.06421 in}

OS 0.50: 1.753—1.756 mm {0.06902—0.06913 in}

End Of Sie

CRANKSHAFT INSPECTION

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1. Measure the crankshaft end play using a dial

gauge.

• If it exceeds the maximum specification,

replace the crankshaft or grind the thrust side

of crankshaft and use the oversize thrust

bearing so that the specified end play is

obtained.

Standard crankshaft end play

0.08—0.29 mm {0.004—0.011 in}

Maximum crankshaft end play

0.30 mm {0.012 in}

Thrust bearing size

STD: 2.500—2.550 mm {0.0985—0.1003 in}

OS 0.25: 2.625—2.675 mm {0.1034—0.1053

in}

2. Measure the runout of the main journal using a V-

block and dial gauge.

• If it exceeds the maximum specification,

replace the crankshaft.

Maximum main journal runout

0.10 mm {0.0039 in}

3. Inspect the main journal diameter and crank pin

diameter. Measurement positions total four and

are in the X and Y directions, at two points (A and

B) as shown in the figure.

• If it is not within the specification or if it

exceeds the maximum off-round, grind the

journal with an oversized bearing.

Standard main journal diameter

49.980—50.000 mm {1.9678—1.9685 in}

Maximum main journal off-round

0.005 mm {0.0002 in}

Standard crank pin diameter

49.980—50.000 mm {1.9678—1.9685 in}

Maximum crank pin off-round

0.005 mm {0.0002 in}

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A

B

X

Y

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MECHANICAL

01-10–37

01-10

4. Inspect the main journal oil clearance using the following procedure:

(1) Install the thrust bearing, upper main bearing and crankshaft.

(2) Position a plastigauge on the journals.

(3) Install the lower main bearing and lower cylinder block. (See 01-10-40 CYLINDER BLOCK ASSEMBLY (I).)

(4) Remove the lower cylinder block. (See 01-10-22 CYLINDER BLOCK DISASSEMBLY (II).)

(5) Measure the main journal oil clearance.

• If it exceeds the maximum specification,

replace the main bearing, or grind the

main journal and use oversized bearings

so that the specified oil clearance is

obtained.

Standard main journal oil clearance

0.016—0.039 mm {0.0007—0.0015 in}

Maximum main journal oil clearance

0.084 mm {0.0033 in}

Main bearing size

STD: 2.489—2.510 mm {0.0980—0.0988 in}

OS 0.25: 2.614—2.617 mm {0.10292—0.10303 in}

OS 0.50: 2.739—2.742 mm {0.10784—0.10795 in}

End Of Sie

DUAL-MASS FLYWHEEL INSPECTION

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Caution

• Do not rework the dual-mass flywheel if it is distorted.

• Do not clean the dual-mass flywheel with any kind of fluid. Clean the dual-mass flywheel with a dry

cloth only.

• Do not clean the gap between the primary and secondary mass. Only clean the bolt connection

surface and the clutch surface.

Inspection Before Removal

1. Rotate the dual-mass flywheel or attempt to move

it up and down, and left and right to verify that the

center of the dual-mass flywheel does not move.

• If there is any movement as indicated by the

arrows in the figure, replace the dual-mass

flywheel.

2. Verify that the secondary mass does not rotate by

15 teeth or more.

• If it rotates by 15 teeth or more, replace the

dual-mass flywheel.

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MECHANICAL

01-10–38

3. Measure the amount of guide pin projection of the

dual-mass flywheel.

• If it exceeds the maximum amount, replace

the dual-mass flywheel.

Dual-mass flywheel guide pin projection

maximum amount

11.0—12.0 mm {0.434—0.472 in}

4. Using a dial indicator, measure the dual-mass

flywheel runout.

• If it exceeds the maximum runout, replace the

dual-mass flywheel.

Dual-mass flywheel maximum runout

1.5 mm {0.059 in}

Inspection After Removal

1. Visually inspect the dual-mass flywheel for crack.

• If there is any crack, replace the dual-mass flywheel.

2. Visually inspect the ring gear on the dual-mass flywheel for damage.

• If there is any damage, replace the dual-mass flywheel.

3. Visually inspect the surface that contacts the clutch disc for scratches, nicks, and discoloration.

• If there is any malfunction, replace the dual-mass flywheel.

Note

• Correct slight scratches and discoloration

using sandpaper.

4. Visually inspect for grease leakage between the

primary mass and secondary mass.

• If there is grease leakage, replace the dual-

mass flywheel.

End Of Sie

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MECHANICAL

01-10–39

01-10

PILOT BEARING INSPECTION

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1. Without removing the pilot bearing, turn the

bearing while applying force in the axial direction.

• If there is any malfunction, replace the pilot

bearing.

End Of Sie

BOLT INSPECTION

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1. Measure the length of the each bolt.

• If it exceeds the maximum specification,

replace the bolt.

Standard cylinder head bolt length

145.2—145.8 mm {5.717—5.740 in}

Maximum cylinder head bolt length

146.5 mm {5.768 in}

Standard connecting rod bolt length

43.7—44.3 mm {1.73—1.74 in}

Maximum connecting rod bolt length

45.0 mm {1.77 in}

End Of Sie

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