Measuring wheel track offset
Place the motorcycle on its main (centre) stand on a flat, level surface.
Place the track offset gauge, BMW No. 36 3 920, against the left or right side of the motorcycle.
Note: In order to use the track alignment gauge on either the left or right side, simply screw the supports in on the other side.
Adjust support (1) so that the measuring plane is as close as possible to the wheel centreline. The gauge must slide freely up to the motorcycle.
Position the measuring stops (arrows) so that they touch the wheel rim and not the tyre.
Attach hook (2) to wheel spoke to secure the gauge firmly to the wheel.
Align front wheel parallel with the gauge.
Measure distance between outer edge of gauge and wheel rim, using depth gauge (3) or ruler, and make a note of the distance.
Calculate wheel track offset «S»:
Wheel track offset «S» is the distance to left or right between the longitudinal axes of the front and rear wheels.
Track offset (S): +3 mm (0.12 in) (= to right)
Permissible wheel track offset (S):±9 mm (0.35 in): datum is + 4.5 mm (0.18 in)
Note: Key to measurement result:
- Negative sign = wheel track offset to left
- Positive sign = wheel track offset to right
EXAMPLE:
Formula S = A + Fh/2 - (B + Fv/2)
Fixed value «A» (length of measuring stops)
A = 50.0 mm (1.97 in)
Half of rear wheel rim width Fh/2 = 66.3 mm (2.61 in)
A + Fh/2 = 116.3 mm (4.58 in)
Measured value (B)+
B = 70.0 mm (2.76 in)
Half of front wheel rim width
Fv/2 = 47.5 mm (1.87 in)
B + Fv/2 = 117.5 mm (4.63 in)
Track offset «S»
S = A + Fh/2 - (B + Fv/2)
S = 116.3 mm – 117.5 mm (4.58 in - 4.63 in)
Track offset «S» = -1.2 mm (-0.05 in)
Measuring the leading link
Remove leading link — See 31.
Secure the leading link with shaft (1) to leading link gauge, BMW No. 31 5 640.
Tighten the shaft until the leading link is located in the gauge with no axial play.
Note:
- Shaft (1) must slide into the leading link without resistance.
- Check runout of shaft (1).
Insert test mandrel (2) all the way into the bore.
Note: Check the leading link for signs of the paint flaking.
Interpreting result of measurement:
Test mandrel slides all the way into the bore without resistance — OK
Test mandrel sticks, force is required to slide it into the bore or it cannot be inserted — Replace leading link
Install leading link — See 31.