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.
READ NEXT:
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
SEE MORE:
Turn signal
Turn signal in exterior mirror
When driving and during operation of the turn
signals or hazard warning system, do not fold in
the exterior mirrors, so that the signal lights on
the exterior mirror are easy to see.
Using turn signals
Press the lever past the resistance point.
Triple turn signal acti
Emergency Request
Intelligent emergency call
Concept
In case of an emergency, an Emergency Request
can be triggered automatically by the system
or manually.
General information
Only press the SOS button in an emergency.
The Intelligent Assist system establishes a connection
with the BMW Response Center.
For technica
