BMW 3: IROX coating - Crankshaft drive
Detailed magnification of the IROX coating
- IROX-coated bearing shell
- Oil film
- IROX coating
- Bearing shell
- Binding resin
- Hard particle
- Solid lubricant
The IROX coating is applied to a conventional bearing shell. It consists of a binding resin matrix made of polyamide-imide with embedded hard particles and solid lubricants. The polyamide-imide ensures, in combination with the hard particles, that the bearing shell surface is so hard that material abrasion is no longer possible. The solid lubricants reduce surface friction and replace the oil film which briefly no longer exists between the bearing shell and the connecting rod bearing journal during the starting phase. The IROX bearings are red due to their special coating.
The IROX-coated bearing shells are only located on the connecting rod side as here the load acts mainly on the bearing shells. The bearing shell caps are equipped with a bearing shell without IROX coating.
If a connecting rod bearing cap is mounted the wrong way round or on another connecting rod, the fracture structure of both parts is destroyed and the connecting rod bearing cap is not centered. In this event the entire set of connecting rods must be replaced with new parts. In Service please observe the specified jointing torques and angle of rotation specifications in the repair instructions.
Bearing shell classification of connecting rod bearing
The connecting rod bearing shells are available in one standard size. It is therefore not necessary to follow a procedure similar to that used with the main bearing shells of the crankshaft.
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Chain drive - Crankshaft drive
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-vacu
Chain tensioner
Chain tensioner
Tensioning rail
Sealing sleeve
Chain tensioner with screw thread
Due to the cylinder head manufacturing process, the chain tensioner now has a
sealing sleeve with a
height of 12
Valve gear
VANOS
VANOS unit B46 engine and B46TU/B48TU engines
VANOS B46 engine
VANOS B46TU and B48TU engine
Following the changeover from a two-part chain drive to a single-part chain
drive, the camshaft
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Data entry and data transfer into
the vehicle
General information
Depending on the vehicle equipment, comfort
and individual settings can be stored in the vehicle
and modified or reset at any time.
For example, this includes:
Settings for the seat and steering wheel positions.
Suspension and climate control settings.
If necessary, data can
Control Display
Safety information
NOTICE Objects in the area in the front of the Control
Display can shift and damage the Control Display.
There is a risk of damage to property. Do
not place objects in the area in front of the
Control Display.
Switching on/off automatically
The Control Display is switched on auto
