BMW 5 Series: Chain track

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
- Upper timing chain
- Timing chain
- Lower timing chain
- Drive chain, oil vacuum pump
The way the combined oil vacuum pump is driven via a separate drive chain
from the crankshaft has
not changed compared with the Bx8 engines. Only the change of the chain tracks
has changed:
The drive chain of the oil vacuum pump is now in front of the timing chain.
Dropping the second timing chain offers the following benefits:
- Improved acoustics
- Lower space requirement
- Reduced weight
Chain tensioner

Chain tensioner, Bx8TU engine
- 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 12.5 mm instead of a sealing ring. The spring force of the chain
tensioner lies between
40 Nm (extended) and 90 Nm (retracted).
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VANOS
VANOS B58 engine
VANOS B58TU engine
Following the changeover from a two-part chain drive to a single-part chain
drive, the camshaft
sprockets on the VANOS now need 46 teeth instead of the
Vacuum pump
Oil vacuum pump, B58/B58TU engine
B58 engine, tandem oil pump with integrated vacuum pump
B58TU engine, oil pump
Vacuum pump
Oil pump
Vehicles with a gasoline engine and "traditio
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