BMW AG Motorcycle (K1100LT, K1100RS). Manual - part 12

12.13

Checking armature for short to earth

•

Measure resistance between slip rings and ar-
mature.

L

 Note:

The resistance must be infinitely large.

Measurement result:

...................... OL = open line

Checking resistance between phase outputs

•

Check resistance between each pair of outputs.

1 – 2
1 – 3
2 – 3

Nominal resistance: . . . . . . . . . . . . . . . . . . . . . .0,6 

Ω

The winding is in perfect working order at measured 
values below 1.0 

Ω

. 

Checking stator winding for short to earth

•

Check winding outputs individually with respect 
to earth.

L

 Note:

The resistance must be infinitely large.
Measurement result: OL = open line.

LT120120

OL

LT120130

1

2

3

LT120140

12.14

Alternator 
[LT from 1992 model year on, RS]

•

Remove fastening screws (1) from cover.

•

Release clips (2) and take off cover.

•

Remove voltage regulator (3)

.

•

Remove coupling housing (4), using counter-
holder, BMW No. 12 4 600. 

•

Assemble in the reverse order of work.

X 

Tightening torque:

Coupling housing

......................................... 50 Nm

LT120220

2

3

1

LT120090

4

12 4 600

12.15

Checking alternator

L

 Note:

Before measuring the resistance with the BMW di-
agnostic tester, this must be zeroed:
Connect the positive (yellow) and negative (green) 
leads. 
Press the 

Ω

 key until the digital display shows 

0.00

Ω.

•

Using BMW diagnostic tester, 
BMW No. 61 1 510,  measure the resistance be-
tween the sliprings.

Measured result:  . . . . . . . . . . . . . . . . . . . . . . .3 

Ω

Checking armature for short to earth

•

Measure resistance between sliprings and arma-
ture.

Measured result: . . . . . . . . . . . . . . . 

OL = open line

61 1 510

RS120070

61 1 510

RS120060

OL

12.16

Removing and installing starter

•

Remove control unit.

•

[ABS I] 

Remove control unit.

•

[ABS II] 

Drain front and rear brake systems.

•

[ABS II] 

Remove pressure modulator.

•

Remove battery.

•

[ABS II] 

Take off battery carrier.

•

Release earth (ground) connection (1) at starter.

•

Release positive lead at starter.

•

Release second retaining screw (3).

•

Pull out starter towards rear.

•

Install in the reverse order of removal.

L

 Note:

[ABS II] 

Refill the front and rear brake systems.

X 

Tightening torques:

Starter to transmission

................................... 9 Nm

Positive lead to starter

.................................... 5 Nm

LT120150

2

3

1

12.17

Disassembling and assembling starter

•

Clamp starter at retaining lugs in 
vice with jaw guards.

•

Release retaining bolts (1).

•

Detach bearing cap (2).

•

Check seal (3) and O-ring (4).

•

Pull out armature (5).

•

Note spacer washer (6)

•

Check O-ring (10).

LT120160

2

3

4

5

6

1

12.18

Removing and installing brush holder

1.

Hexagon nut

2.

Outer insulator

3.

Carbon brush holder

4.

Brush retaining plate

5.

O-ring

6.

Inner insulator 

LT120170

5

1

4

3

6

2

12.19

Renewing carbon

 

brushes

•

With the aid of a small screwdriver, lift spring (1) 
and pull out carbon brush.

L

 Note:

Fit carbon brush so that the chamfered side (arrow) 
faces towards the spring.

LT120180

1

12.20

Checking starter

•

Connect voltmeter between positive and nega-
tive pole of battery.

•

Operate starter for 2...3 seconds.

•

Read off value.

L

 Note:

If the read-off value is below 8 Volt, this indicates the 
battery does not have its full capacity.
Note down value if measured value is above 8 Volt.

•

Connect voltmeter between positive and nega-
tive lead at starter.

•

Operate starter for 2...3 seconds.

•

Read off measured value and compare with the 
value noted down.

L

 Note:

The starter is defective if the difference between the 
two values is greater than 0.5 Volt.

LT120190