BMW 5 Series: Crankcase
Honing process

Honing process "old/new"
- Previous manufacturing process of internal cylindrical honing
- New manufacturing process of form honing
The cylindrical bore hole of a combustion engine becomes deformed during the
operating condition
by thermal loads. Form honing allows this deformation to be achieved in
production, so that there is an
almost cylindrical shape in the operating condition. This has a positive effect
on the emissions quality,
oil and fuel consumption, as well as output and wear.
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Features:
Chain drive at the side of the engine emitting the forces
Single-part chain drive for driving the camshafts
Single sleeve-type chain 8 mm
Electric motor of the combined oil-vacuum
Comparison between chain track of B58 engine and B58TU engine
Chain track, two-part timing chain drive B58 engine
Chain track, single-part timing chain drive B58TU engine
6-cylinder engine
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This Owner's Manual describes all models and
all standard, country-specific and optional equipment
that is offered in the model series. Therefore,
this Owner's Manual also describes and illustrates
features and functions that are not
available in a vehicle, for example because of the
selected option
Digital Motor Electronics (DME, DME2)
Digital Motor Electronics DME and DME2
The illustration shows the DME and DME2 control units. The DME control unit
is on the left side (seen
in the direction of travel).
The DME is responsible for the control of the combustion engine. In addition,
the DME is