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Valve Clearance

Standard: IN: 0.11~ 0.19 mm (0.004 - 0.008 in.)

EX: 0.22 ~ 0.31 mm (0.009 ~ 0.012 in.)


OWhen positioning #4 piston TDC at the end of the compression stroke:

Inlet valve clearance of #2 and #4 cylinders Exhaust valve clearance of #3 and #4 cylinders Measuring Valve [A]



OWhen positioning #1 piston TDC at the end of the compression stroke:

Inlet valve clearance of #1 and #3 cylinders Exhaust valve clearance of #1 and #2 cylinders Measuring Valve [A] ★



★ If the valve clearance is not within the specified range, first record the clearance, and then adjust it.


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2-24 PERIODIC MAINTENANCE

Maintenance Procedure

Valve Clearance Adjustment

  • To change the valve clearance, remove the camshaft chain tensioner, camshafts and valve lifters. Replace the shim with one of a different thickness.

NOTE

O Mark and record the valve lifter and shim locations so they can be reinstalled in their original positions. o If there is no clearance, select a shim which is several sizes smaller and then measure the clearance.

  • To select a new shim which brings the valve clearance within the specified range, refer to the Valve Clearance Adjustment Charts.

  • Apply a thin coat of molybdenum disulfide grease to the valve lifters.

  • Install the camshafts. Be sure to time the camshafts prop­erly (see Engine Top End chapter).

  • Remeasure any valve clearance that was adjusted. Readjust if necessary.

CAUTION

Do not put shim stock under the shim. This may cause the shim to pop out at high rpm, causing ex­tensive engine damage.

Do not grind the shim. This may cause it to fracture, causing extensive engine damage.

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PERIODIC MAINTENANCE 2-25

Maintenance Procedure

Valve clearance adjustment chart inlet valve

  1. Measure the clearance (when engine is cold).

  2. Check present shim size.

  3. Match clearance in vertical column with present shim size in horizontal column.

  4. Install the shim specified where the lines intersect. This shim will give the proper clearance.

Example: Present shim is 3.05 mm

Measured clearance is 0.35 mm Replace 3.05 mm shim with 3.25 mm shim.

  1. Remeasure the valve clearance and readjust if neces­sary.

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PRESENT SHIM *—Example

PART No. (92180 -)

1014

1010

1018

1020

1022

1024

1026

1028

1030

1032

1034

1036

1038

1040

1042

1044

1040

1048

1050

1052

1054

MARK

50

55

00

85

70

75

80

85

90

95

00

05

10

15

20

25

30

35

40

45

50

THICKNESS (mm)

2.50

2.55

2.60

2.65

2.70

2.75

2.80

2.85

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3 25

3.30

3.36

3.40

3.45

3.60

0.00

0.02

0.03

-

0 06

0.07

-

0.11

0.12

—

0.16

o

0.17

0.21

£

C

0.22

0.31

u

0.32

-

0.36

0.37

0.41

0.42

*

0.46

►-

Z

0.47

-

0.51

5

0.52

0.56

cc

D

0.57

-

0.61

</)

<

0.62

0.86

5

0.67

—

0.71

Ui

U

0.72

—

0.76

z

<

0.77

0.81

DC

<

0.82

—

0 86

-j

G

0.87

0.91

UI

>

0.92

-

0.96

<

>

0.97

-

1.01

1.02

-

1.06

1.07

1.11

1.12

-

1.16

1.17

-

1.21

1.22

-

1.26

1.27

~

1.31

2.50

2.55

2.60

2.65

2.70

2.75

2.80

2.85

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

2.50

2.55

2.60

2.65

2.70

2.75

2.80

2.85

2.90

2.95

3.00

3.06

3.10

3.15

3.20

3.25

3.30

2.50

2.55

2.60

2.65

2.70

2.75

2.80

2.86

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

2.50

2.55

2.60

2.65

2.70

2.75

2.80

2.86

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

2.50

2.55

2.60

2.65

2.70

2.75

2.80

2.85

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

SPECIFIED

CLEARANCE/NO CHANGE

REQUIRED

2.56

2.60

2.05

2.70

2.75

2.80

2.85

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

2.60

2.65

2.70

2.75

2.80

2.85

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

2.65

2.70

2.75

2.80

2.86

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

2.70

2.75

2.80

2.85

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

2.75

2.80

2.85

2.90

2.95

3.00

3.06

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

2.80

2.85

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

2.85

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

3.00

3.06

3.10

3.15

3.20

3.25

3.30

3.36

3.40

3.46

3.50

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

3.16

3.20

3.25

3 30

3.35

3.40

3.45

3.50

3.20

3.25

3.30

3.35

3.40

3.45

3.50

3.25

3.30

3.35

3.40

3.45

3.50

3.30

3.35

3.40

3.45

3.50

3.35

3.40

3.45

3.50

3.40

3.45

3.50

\lN

STALL THE SHIM OF THIS THICKNESS (m

m)

3.45

3.50

3.50

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