BMW AG Motorcycle (R 850 C, R 1200 C). Manual - part 9

11.38

Dismantling crankcase

•

Turn engine on to its side.

•

Remove screws on right side.

RS110261

M1

0 x

 1

0

0

‹

M1

0 x

 10

0

‹

M8

 x

 8

0

M8

 x

 8

0

M8

 x

 3

5

M8

 x

 3

5

11.39

•

Turn engine on to its side.

•

Remove screws on left side.

•

Remove upper section of crankcase.

RS110260

M6

 x

 50

M6 x

 50

M6 x

 50

M6

 x

 5

0

M6

 x

 2

5

M6

 x

 2

5

M

10 x

 10

0

‹

M1

0 x

 10

0

‹

M6

 x

 5

0

M6

 x

 5

0

M6

 x

 50

M6 x

 35

M6

 x

 3

5

M6

 x

 3

5

M6 x

 3

5

M6

 x

 3

5

M6

 x

 3

5

M6

 x

 3

5

M6 x

 5

0

M6 x

 2

5

M6 x

 5

0

11.40

Removing crankshaft, auxiliary shaft 
and timing chain tensioning and slide 
rails

RS110290

11.41

Removing and installing oil pick-up 
basket

X 

Tightening torque:

M 6 screw ...................................................... 9 Nm

e

 Caution:

Make sure that the O-ring is not omitted, and is in-
stalled undamaged.

Replacing oil level sight glass

•

Pierce the plastic disc with a large screwdriver 
and lever out the oil level sight glass.

•

Coat the sealing face of the new oil level sight 
glass with engine oil and drive it in with drift, 
BMW No. 00 5 550. 

Removing conrods

•

Clamp crankshaft in a vise provided with protec-
tive jaws.

•

Remove conrod.

e

 Caution:

Do not accidentally confuse the conrods.

Checking conrods 

•

Check conrod dimensions.

a

............................................See Technical data

e

 Caution:

Sintered-metal conrods must never be straightened – 
risk of fracture.

RS110300

11.42

Measuring main and big end bearing 
play

Measuring radial bearing play

•

Measure main bearing journal with an external 
micrometer crosswise in two planes, A and B.

•

Enter measured values on record sheet.

a

............................................See Technical data

e

 Caution:

The crankshaft can only be reground in grinding 
stage 0; after this it must be rehardened and fin-
ished. Grinding stages are identified by a paint mark 
on the front crank web.
a ................................See Technical data
If the bearing shells have to be replaced, note color-
ed marks on crankpins and big end bearings.

RS110310

11.43

Installing main bearing

•

Insert tensioner rail/slide rail pivot pin (1) for 
centering purposes.

•

Tighten M8 and M10 housing screws.

X 

Tightening torque/tightening order:

1. M 10 screw (oiled) .................................... 45 Nm
2. M 8 screw (oiled) ...................................... 20 Nm

•

Measure main bearings front/back in the load di-
rection.

•

Enter measured values on record sheet and de-
termine main bearing play values.

a

............................................See Technical data

Measuring axial bearing play

•

Place crankshaft in engine block.

•

Insert tensioner rail/slide rail pivot pin (1) for 
centering purposes.

•

Tighten housing screws.

•

Screw measuring device, BMW No. 00 2 500, 
with dial gauge, BMW No. 00 2 510, into tapped 
hole for alternator carrier cover.

•

Move crankshaft forwards and backwards and 
read off play at dial gauge.

a

............................................ See Technical data

RS110320

1

00 2 500

RS110910

00 2 510

11.44

Measuring big end bearing play

•

Measure crankpin with an external micrometer in 
the thrust direction and offset through 90

o

.

•

Install bearing shells and assemble conrods.

•

Using tightening angle gauge,
BMW No. 11 2 210, tighten the big end bolt.

X 

Tightening torque:

Big end bolts oiled
Joint torque.................................................. 20 Nm
Wrench angle .................................................... 80°

•

Measure big end bearing with internal gauge in 
thrust direction.

•

Enter measured values on record sheet and de-
termine big end bearing clearances.

a

............................................ See Technical data

RS110340

11 2 210

RS110350

RS110360

11.45

Assembling engine

Installing conrod

•

Clamp crankshaft in a vise provided with protec-
tive jaws.

•

Oil the big end bolts, screw them in by hand and 
tighten with angle gauge, BMW No. 11 2 210.

e

 Caution:

Oil the bearings. 
Do not accidentally confuse conrods or bearing 
shells. 
Always use new big end bolts.

Installed direction of conrods: ..lettering facing up

X 

Tightening torque:

Big end bolts (oiled)
Joint torque.................................................. 20 Nm
Wrench angle .................................................... 80°

11 2 210

RS110370