Mazda 5. Manual — part 7

01–10–14

MECHANICAL

Valve Guide Installation

1. Assemble the SSTs so that depth L is as

specified.

Depth L:

12.2—12.8 mm {0.481—0.503 in}

2. Tap the valve guide in from the cam side using the

SSTs assembled in Step 1.

3. Verify that the valve guide projection height

(dimension A) is within the specification.

Standard height:

12.2—12.8 mm {0.481—0.503 in}

End Of Sie

VALVE SEAT INSPECTION/REPAIR

B3E011010102201

1. Measure the seat contact width.

• If not within the specification, resurface the valve seat using a 45° valve seat cutter and/or resurface the

valve face.

Standard width:

1.2—1.6 mm {0.048—0.062 in}

2. Verify that the valve seating position is at the

center of the valve face.
(1) If the seating position is too out side, correct

the valve seat using a 70

° (IN) or 65° (EX)

cutter, and a 45

° cutter.

L

49 L012 004A

49 L012 003A

49 L012 002A

B3E0110E071

49 L012 004A

49 L012 003A

49 L012 002A

VALVE GUIDE

B3E0110E072

A

VALVE GUIDE

CYLINDER HEAD

B3E0110E069

SEAT CONTACT
WIDTH

ADA2224E019

MECHANICAL

01–10–15

01

(2) If the seating position is too inner side, correct

the valve seat using a 35

° (IN) cutter, and a

30

° (EX) cutter, and a 45° cutter.

3. Inspect the sinking of the valve seat. Measure the

protruding length (dimension L) of the valve stem.

• If not specified, replace the cylinder head.

Standard dimension L:

IN: 40.64—42.24 mm {1.600—1.662 in}
EX: 40.50—42.10 mm {1.595—1.657 in}

End Of Sie

VALVE SPRING INSPECTION

B3E011012125201

1. Apply pressing force to the pressure spring and inspect the spring height.

• If it is less than the specification, replace the valve spring.

Pressing force

390 N {39.76 kgf, 87.67 lbf}

Standard height

28.68 mm {1.129 in}

2. Measure the out-of-square of the valve spring,

using a square, as shown in the figure.
(1) Rotate the valve spring one full turn and

measure "A" at the point where the gap is the
largest.

• If it exceeds the specification, replace the

valve spring.

Valve spring maximum out-of-square

1.95 mm {0.0767 in}

End Of Sie

CAMSHAFT INSPECTION

B3E011012420201

1. Set the No.1 and No.5 journals on V-blocks.
2. Measure the camshaft runout.

• If it exceeds the specification, replace the camshaft.

IN

70

°

45

°

35

°

EX

65

°

45

°

30

°

B3E0110E133

L

ADJ2224E079

ADJ2224E028

A

UPPER

LOWER

B3E0110E073

01–10–16

MECHANICAL

Maximum runout

0.03 mm {0.0012 in}

3. Measure the cam lobe height at the two points as

shown in the figure.

• If it is less than the specification, replace the

camshaft.

Camshaft standard height (mm {in})

With variable valve timing mechanism

(LF,L3)

IN: 42.44 {1.671}
EX: 41.18 {1.621}
LF,L3
IN: 42.12 {1.659}
EX: 41.08 {1.618}
L8
IN: 40.79 {1.606}
EX: 41.08 {1.618}

Camshaft minimum height (mm {in})

With variable valve timing mechanism (LF,L3)
IN: 42.33 {1.666}
EX: 41.06 {1.616}
LF,L3
IN: 42.01 {1.653}
EX: 40.96 {1.612}
L8
IN: 40.67 {1.601}
EX: 40.96 {1.612}

4. Measure the journal diameters in X and Y directions at the two points (A and B) as indicated in the figure.

• If it is less than the specification, replace the camshaft.

Standard diameter

24.96—24.98 mm {0.9827—0.9834 in}

Minimum diameter

24.95 mm {0.982 in}

5. Remove the tappet.

6. Position a plastigauge atop the journals in the

axial direction.

7. Install the camshaft cap. (See 01–10–39

Camshaft Assembly Note.)

8. Remove the camshaft cap. (See 01–10–6

Camshaft Cap Disassembly Note.)

9. Measure the oil clearance.

• If it exceeds the specification, replace the

cylinder head.

Standard clearance

0.04—0.08 mm {0.002—0.003 in}

B3E0110E074

B3E0110E076

A

B

X

Y

B3E0110E075

PLASTIGAUGE

B3E0110E077

MECHANICAL

01–10–17

01

Maximum clearance

0.09 mm {0.0035 in}

10. Install the camshaft cap. (See 01–10–39 Camshaft Assembly Note.)
11. Measure the camshaft end play.

• If it exceeds the specification, replace the cylinder head or camshaft.

Standard end play

0.09—0.24 mm {0.0035—0.0094 in}

Maximum end play

0.25 mm {0.0099 in}

12. Remove the camshaft cap. (See 01–10–6

Camshaft Cap Disassembly Note.)

End Of Sie

TAPPET INSPECTION

B3E011012310201

1. Measure the tappet hole inner diameter in X and

Y directions at the two points (A and B) shown in
the figure.

Inner diameter

31.000—31.030 mm {1.2205—1.2216 in}

2. Measure the tappet body outer diameter in X and

Y directions at the two points (A and B) shown in
the figure.

Outer diameter

30.970—30.980 mm {1.2193—1.2196 in}

3. Subtract the tappet body outer diameter from the

tappet hole inner diameter.

• If it exceeds the specification, replace the

tappet or cylinder head.

Standard clearance

0.02—0.06 mm {0.0008—0.0023 in}

Maximum clearance

0.15 mm {0.006 in}

End Of Sie

CYLINDER BLOCK INSPECTION

B3E011010300201

1. Measure the distortion of the cylinder block top surface in six directions as indicated in the figure.

• If it exceeds the maximum, replace the cylinder block.

B3E0110E078

X

Y

A

B

ADJ2224E023

A

B

Y

X

ADJ2224E029