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B468/B58 Engine
The B46/B58 engines have two separate coolant circuits. The coolant in the
low-temperature coolant
circuit to cool the charge air. The coolant in the high-temperature coolant
circuit to cool the engine.
The two coolant circuits each have their own expansion tank.
Overview of the
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 previous 36 teeth. To
compensate for the
additional weight of the larger camshaft sprockets, the ad