Toein or out check front or rear wheels

1 Position a wheel clamp against one of the front wheels so that two of the threaded contact studs mounted on the lower clamp arm rest inside the rim flange in the lower half of the wheel. For aluminium wheels change screw studs for claw studs provided in the kit.

2 Rotate the tee handle on the centre adjustment screw until the top screw studs mounted on the upper clamp arm contact the inside rim flange in the upper half of the wheel. Fully tighten centre adjustment screw tee handle to secure clamp to wheel.

3 Repeat steps 1 and 2 for opposite side front wheel.

4 Push a measuring gauge over each wheel clamp stub shaft and tighten thumbscrews. This should not prevent the measuring gauge rotating independently to the wheel clamp.

5 Attach the elastic cord between the uncoloured hole in the rotor of each measuring gauge.

6 Wheel lateral run-out is compensated by the following procedure of steps 7-10.

7 Lift the front of the vehicle until the wheels clear the ground and place a block underneath one of the wheels (in the case of front wheel drive vehicles) to prevent it from rotating.

8 Position both measuring gauges horizontally and hold the measuring gauge opposite the blocked wheel. Slowly rotate the wheel one complete revolution and observe the measuring gauge reading which will move to and fro and record the extreme of the pointer movement on the scale. Make sure that the elastic cord does not touch any part of the vehicle or jack.

9 Further rotate wheel in the same direction until the mid-position of the wheel rim lateral run-out is obtained, then chalk the tyre at the 12 o'clock position.

Table 9.1 Conversion of degrees to millimetres

Degree Rim size

Table 9.1 Conversion of degrees to millimetres

Degree Rim size

10"

12"

13"

14"

15"

16"

mm

mm

mm

mm

mm

mm

5

0.40

0.48

0.53

0.57

0.60

0.64

10

0.80

0.96

1.06

1.13

1.21

1.28

15

1.20

1.44

1.59

1.70

1.81

1.92

20

1.60

1.92

2.12

2.27

2.42

2.56

25

2.00

2.40

2.65

2.84

3.02

3.20

30

2.40

2.88

3.19

3.40

3.62

3.84

35

2.80

3.36

3.72

3.97

4.22

4.48

40

3.20

3.84

4.25

4.54

4.83

5.12

45

3.60

4.32

4.78

5.11

5.43

5.76

50

4.00

4.80

5.31

5.67

6.03

6.40

55

4.40

5.28

5.84

6.24

6.64

7.04

1.00

4.80

5.76

6.37

6.81

7.24

7.68

1.05

5.20

6.24

6.90

7.38

7.85

8.32

1.10

5.60

6.72

7.43

7.95

8.45

8.96

1.15

6.00

7.20

7.96

8.51

9.06

9.60

1.20

6.40

7.68

8.49

9.07

9.66

10.24

1.25

6.80

8.16

9.03

9.64

10.25

10.88

1.30

7.20

8.64

9.56

10.21

10.86

11.52

1.35

7.60

9.12

10.09

10.78

11.47

12.16

1.40

8.00

9.60

10.62

11.35

12.08

12.80

1.45

8.40

10.08

11.15

11.91

12.68

13.44

1.50

8.80

10.56

11.68

12.48

13.28

14.08

1.55

9.20

11.04

12.21

13.05

13.89

14.72

2.00

9.60

11.52

12.75

13.62

14.49

15.36

Fig. 9.26(a-c) Wheel track alignment using the Churchill equipment

10 Repeat steps 7 to 9 for the opposite side front wheel.

11 Position each front wheel with the chalk mark at 12 o'clock.

12 Utilize the brake pedal depressor to prevent the wheels from rotating.

13 Slide a turntable underneath each front wheel, remove the locking pins and then lower the front wheels onto both turntables.

14 Bounce the front of the vehicle so that the suspension quickly settles down to its normal height.

15 Tilt each measuring gauge to the horizontal position by observing when the spirit level bubble is in the mid-position. Lock the measuring gauge in the horizontal position with the second thumbscrew.

16(a) Observe the left and right toe angle reading and add them together to give the combined toe angle of the front wheels. (b) Alternatively, turn one road wheel until its measuring gauge pointer reads zero, then read the combined toe angle on the opposite side measuring gauge (front wheels only).

17 Using Table 9.1 provided, convert the toe angle into track toe-in or -out in millimetres and compare with the manufacturer's recommendations.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook


Post a comment