BMW M5 Wartungshandbuch PDF herunterladen (Seite 27)

System components

S85B50 Engine

Basic engine and add-on parts

Upper section of crankcase

The upper section of the crankcase is made

from an aluminium alloy (GK Al-

Si17Cu4Mg T5). The contact surfaces of the

cylinders are machined in accordance with the

Alusil process.

Bedplate

The bedplate consists of an aluminium frame

(G AlSi7Mg0.3 T6) in which the grey cast iron

bearing bridges (GGG 60) are cast. After

casting, the component is subject to stress-

relief annealing for 8 hours at a temperature of

525 °C, it is then quenched in water at 70 °C

and aged for 5 hours at a temperature of

165 °C.

Crankcase

The crankcase comprises the bedplate and

upper section of the crankcase. As already

used on the N42, the seal is provided by a

liquid sealant in a groove that is milled into the

upper section of the crankcase.

It is important that the assembly sequence is

followed precisely in order to avoid stress in

the crankcase when assembling the upper

section and base plate:

1. Position the bedplate diagonally on the

bearing blocks 1 and 6 by means of two

M8x94 screws.

2. Provisionally fasten the bedplate with the

ten M8x94 screws.

3. Tighten the M11x115 bolts to setting

torque

4. Tighten the M11x115 bolts to specified

rotary angle

5. Tighten the M8x94 bolts to setting torque

6. Tighten the M8x94 bolts to specified

torque

7. Tighten the M8x60, M8x35 and M8x25

bolts to the specified torque

Cylinder head

The cylinder head is made from an aluminium

alloy (GK AlSiMgCu0.5 wa).

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 119 120

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