Content .. 10 11 12 13 ..

BMW AG Motorcycle (R 850 C, R 1200 C). Manual - part 12

11.62

Installing alternator

•

Install alternator.

Poly-V belt adjusting procedure:
Poly-V belt installation procedure:

•

Screw hex nut (1) on adjusting screw (2) up
handtight (no tools to be used)

•

Tighten adjusting screw (2) with a torque wrench,
fully tighten retaining nut (3), slacken adjusting
screw and tighten screws fully.

Tightening torque:

Pre-tension Poly-V belt
with adjusting screw....................................... 8 Nm
Alternator to alternator support cover........... 20 Nm

•

Install front cover.

RS110480

RS110490

11.63

•

Install oil filter with oil filter wrench,
BMW No. 11 4 650.

•

Insert and tighten oil drain plug with a new seal.

Tightening torque:

Oil filter (sealing face lightly oiled) ................ 11 Nm
Oil drain plug................................................ 32 Nm

•

Install spark plugs with spark plug socket
wrench, BMW No. 12 3 510.

Tightening torque:

Spark plug.................................................... 20 Nm

Installing engine

•

Work in reverse order to that stated for removal.

11 4 650

RS110950

12 3 510

RS000010

12.1

Contents

Page

Technical data

................................................................................................................................3

Removing and installing coil and ignition lead

............................................................5

Check ignition coil resistance

...................................................................................................5

Removing and installing alternator

....................................................................................6

Poly-V belt adjusting procedure: .........................................................................................................6

Dismantling/reassembling
alternator

...........................................................................................................................................7

Checking alternator

........................................................................................................................7

Checking armature for short to ground (earth)

..................................................................7

Removing and installing starter motor

.............................................................................8

Dismantling/reassembling starter motor

........................................................................9

Renewing carbon brushes

..........................................................................................................9

Checking starter motor

................................................................................................................9

Checking starter relay

...................................................................................................................9

Removing and installing magnetic gate

........................................................................10

Timing the ignition

........................................................................................................................11

12 Engine electrics

12.3

Technical data

R 850 C

R 1200 C

Starter motor

Type

Permanent-magnet motor with planetary gear
drive

Gear ratios

Planetary gears 5.5 : 1

Power rating

kW 1.1

Alternator

Type

Three-phase alternating-current generator with
integrated all-electronic voltage regulator

Drive

Poly-V belt

Gear ratios

1 : 1.5

Maximum output rating

W/V 700/14

Maximum current at engine speed
4000 min

-1

A 50

Nominal current at engine speed 1000 min

-1

A 18

Max. operating speed

min

-1

20 000

Spark plug

Bosch

FR 6 DDC

Electrode gap

mm (in) 0.8 (0.03)

Wear limit

mm (in) 1.0 (0.04)

Thread

metric M 14 x 1.25

Ignition

Ignition system

Motronic (mapped characteristic control)

Ignition trigger

Two magnetic gates (Hall-effect transmitters)
driven from crankshaft

Ignition timing

°CS 0° … + 43° before OT

Static ignition timing

°CS Adjustment at TDC

Ignition coil

Twin-spark coil

Resistance: Primary

Ω

0.5

between terminals 15 and 1

Secondary

Ω

7.5

between terminals 4a and 4b

12.5

Removing and installing coil and
ignition lead

•

Remove fuel tank.

Caution:

Switch off ignition. Disconnect ground (earth) cable
at battery and insulate it.

•

Pull off spark plug cap with special puller,
BMW No. 12 3 520.

•

Release threaded connection for central electri-
cal equipment box.

•

Remove ignition leads.

Check ignition coil resistance

•

Test with BMW MoDiTeC.

12 3 520

C120030

12.6

Removing and installing alternator

•

Remove seat.

•

Remove fuel tank.

Caution:

Switch off ignition. Disconnect ground (earth) cable
at battery and insulate it.

•

Remove horn with holder.

•

Remove front cover from engine.

•

Remove alternator retainers (1, 2, 3).

•

Remove rotary breather tube.

•

Remove Poly-V belt.

•

Remove the starter motor.

•

Lock clutch housing with special tool
BMW No. 11 5 640.

•

Remove Poly-V belt pulley with rotor gate at
crankshaft.

•

Remove the left exhaust pipe.

•

Drain engine oil.

•

Remove the oil cooler return line.

•

Pull the rear of the motorcycle down to the hoist
platform and secure it with a strap or similar.

•

Detach the left air intake flange.

Caution:

Mask off the leading link to prevent it from being
scratched.

•

Release the threaded connection for the lower
suspension strut mount.

•

Release the leading link shaft at the right and re-
move it to the left.

•

Pull the leading link forwards.

•

Place sliding sleeve, BMW No. 11 5 680, on the
crankshaft and remove the alternator support
cover.

•

Detach the central electrical equipment box and
raise it as far as possible.

•

Detach the connecting leads at the alternator.

•

Remove the alternator.

•

Install by following the above work instructions in
the reverse order.

Poly-V belt adjusting procedure:
Poly-V belt installation procedure:

•

Place the Poly-V belt in position, tension it and
turn the engine over once, then release belt ten-
sion.

Poly-V belt tensioning procedure:

•

Loosen alternator mount (1, 2, 3).

•

Screw up hex nut (1) at adjusting screw (4) lightly
by hand (using no tools).

•

Tighten adjusting screw (4) using torque wrench;
fully tighten retaining nut (3), slacken off adjusting
screw and tighten down screws.

Note:

See also Service Information 12 020 95 (700).

Tightening torque:

Poly-V belt preload......................................... 8 Nm
Alternator to alternator support cover........... 20 Nm
Positive lead to alternator ............................. 15 Nm
Belt pulley at alternator ................................ 50 Nm

RS110480

12.7

Dismantling/reassembling
alternator

•

Take out the cover retaining screws (1).

•

Release clips (2) and remove the cover.

•

Remove voltage regulator (3).

•

Remove the Poly-V belt pulley.

•

Install by following the above work instructions in
the reverse order.

Tightening torque:

Belt pulley at alternator................................. 50 Nm

Checking alternator

•

Test with BMW MoDiTeC.

Checking armature for short to ground
(earth)

•

Test with BMW MoDiTeC.

RS120050

12.8

Removing and installing starter
motor

Caution:

Disconnect earth (ground) lead from battery.
Insulate earth (ground) lead.

•

Release starter motor cover (1).

•

Remove the cover.

•

Detach lead (2).

•

Release starter motor retainer (3).

•

Remove the starter motor.

•

Install by following the above work instructions in
the reverse order.

Tightening torque:

Starter motor to engine ................................ 20 Nm
Starter motor cover to gearbox housing ......... 7 Nm
Positive lead to starter motor ....................... 10 Nm

C120020

Content .. 10 11 12 13 ..