Mazda Engine SKYACTIV-G 2.5. Manual - part 11

 

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Mazda Engine SKYACTIV-G 2.5. Manual - part 11

 

 

MECHANICAL 

01-10–28

4. Measure the inner diameter of each valve guide 

using the caliper gauge. Measurement positions 

total six and are in the X and Y directions, at three 

points (A, B, and C) as shown in the figure.

• If it is not within the specification, replace the 

valve guide.

Standard valve guide inner diameter

IN: 5.510—5.530 mm {0.2170—0.2177 in}

EX: 5.510—5.530 mm {0.2170—0.2177 in}

5. Calculate the clearance between the valve stem 

and the valve guide by subtracting the inner 

diameter of the valve guide from the outer 

diameter of the corresponding valve stem.

• If it exceeds the maximum specification, 

replace the valve or valve guide.

Standard clearance between valve stem and 

guide

IN: 0.025—0.060 mm {0.0010—0.0023 in}

EX: 0.030—0.065 mm {0.0012—0.0025 in}

Maximum clearance between valve stem and 

guide

0.10 mm {0.0039 in}

6. Measure the projection height (dimension A) of 

each valve guide using the vernier caliper.

• If it is not within the specification, replace the 

valve guide.

Standard valve guide projection height

IN: 16.4—17.0 mm {0.646—0.669 in}

EX: 16.4—17.0 mm {0.646—0.669 in}

End Of Sie

X

Y

A

B

C

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VALVE STEM

CLEARANCE

VALVE GUIDE

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VALVE GUIDE

CYLINDER HEAD

A

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MECHANICAL 

01-10–29

01-10

VALVE GUIDE REPLACEMENT

id011000501200

Removal

1. Tap the valve guide out from combustion chamber 

side using the 

SST.

Installation

1. Apply clean engine oil to the valve guide.

2. Tap the valve guide from the camshaft side using 

the SST so that the projection height (dimension 

A) is within the specification.

Standard valve guide projection height

IN: 16.4—17.0 mm {0.646—0.669 in}

EX: 16.4—17.0 mm {0.646—0.669 in}

End Of Sie

VALVE SPRING INSPECTION

id011000501400

Caution

• The valve springs differ depending on the 

IN and EX sides.Therefore, verify the free 

length or identification paint beforehand 

and inspect the valve springs.

VALVE GUIDE

49 B012 015

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VALVE GUIDE

CYLINDER HEAD

A

49 B012 015

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48.96 mm {1.928 in}

IN

EX

50.07 mm {1.971 in}

NOT PAINTED

PURPLE PAINT

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MECHANICAL 

01-10–30

1. Measure the valve spring height using the spring 

tester.

• If it is not within the specification, replace the 

valve spring.

Valve spring installation height

When pressurized with spring force of 228—

252 N {23.3—25.6 kgf, 51.3—56.6 lbf}, 

spring height is 38.0 mm {1.50 in}

2. Measure the amount of off-square on the valve 

spring using a square.

(1) Rotate the valve spring one full turn and 

measure A at the point where the gap is the 

largest.

• If it exceeds the maximum specification, 

replace the valve spring.

Maximum valve spring off-square

IN: 2.0 ° (1.7 mm {0.067 in})

EX: 2.0 ° (1.7 mm {0.067 in})

End Of Sie

CAMSHAFT INSPECTION

id011000501500

1. Set the No.1 and No.5 journals of the camshaft on V-blocks.

2. Measure the camshaft runout using the dial 

gauge.

• If it exceeds the maximum specification, 

replace the camshaft.

Maximum camshaft runout

0.030 mm {0.0012 in}

3. Measure the cam height using the micrometer as 

shown in the figure.

• If it is less than the minimum specification, 

replace the camshaft.

Standard cam height

IN: 42.34 mm {1.667 in}

EX: 40.37 mm {1.589 in}

Minimum cam height

IN: 42.27 mm {1.664 in}

EX: 40.30 mm {1.587 in}

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A

UPPER

LOWER

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MECHANICAL 

01-10–31

01-10

4. Measure the journal diameter using the 

micrometer. 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 less than the minimum specification, 

replace the camshaft.

Standard camshaft journal diameter

24.96—24.98 mm {0.9827—0.9834 in}

Minimum camshaft journal diameter

24.93 mm {0.9815 in}

5. Measure the camshaft journal oil clearance using 

the following procedure:

(1) Clean the camshaft journal and the journal receptacle part.

(2) Put the camshaft on the cylinder head with the rocker arm detached.

(3) Cut the plastigauge to the same length as the 

journal width and position it parallel to the 

camshaft.

(4) Install the camshaft caps. (See 01-10-59 

CYLINDER HEAD ASSEMBLY (II).)

(5) Remove the camshaft caps. (See 01-10-14 

CYLINDER HEAD DISASSEMBLY (I).)

(6) Measure the camshaft journal oil clearance.

• If it exceeds the maximum specification, 

replace the cylinder head.

Standard camshaft journal oil clearance

0.035—0.080 mm {0.0014—0.0031 in}

Maximum camshaft journal oil clearance

0.090 mm {0.0035 in}

6. Measure the camshaft end play using a dial 

gauge.

• If it exceeds the maximum specification, 

replace the cylinder head or camshaft.

Standard camshaft end play

0.07—0.22 mm {0.003—0.008 in}

Maximum camshaft end play

0.23 mm {0.0091 in}

End Of Sie

A

B

X

Y

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PLASTIGAUGE

bpe2ue00000032

bp31je00000173

 

 

 

 

 

 

 

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