Page 10 - Catalog spare parts BPW LUFT

Auto Parts / BPW-EL-Luft 31051601e Page 9

Trailing arms 1

General

Conversion of spring pivot bolt
As part of the introduction of new products into series
production, the spring pivot bolt connection on all Airlight O
II air suspensions systems was changed from M 30 to M
24 from September 2007 onwards.
Introducing an M 24 pivot bolt provides greater security SL
due to higher bolt tension being achieved. In addition
the surface area of the clamped interfaces is increased.
This means the bolted connection has been made even AL
less susceptible to settling.
The M 24 spring bolts are Geomet-coated, removing
the need for additional lubrication on new component
assembly.

This modifi cation affects all air suspension systems with
70 mm wide trailing arms (all Airlight II versions).
All the versions were changed over to M 24 at the start of
series production from week 36 / 2007 onwards. Versions
with M 30 spring bolts were not produced from that point
onwards.

The adaptation to M 24 spring bolts is performed by

changing the spring pivot bolt assemblies, the bushes

in the air suspension hanger brackets and channel cross
members and the steel / rubber / steel bushes in the
trailing arms.
The geometry of the actual trailing arm is not changed.
As an assembly, the trailing arms with steel / rubber /
steel bushes for M 24 spring bolts are given the index 2
(example: trailing arm 05.082.13.88.0 for M 30 spring
bolt => trailing arm 05.082.13.88.2 for M 24 spring bolt).

It is possible to adapt from the M 30 spring bolt to the

M 24 spring bolt by changing the steel / rubber / steel
bush.

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