New Generation N62 Engine
Chapter 3 P.65
Course Contents/Background Material
© BMW AG,
Service Training
Note
In the past, fully functional water pumps were often replaced
because the functional sliding ring seal leakage which is
necessary for water pump operation resulted in evaporation
residues being left on the external walls of the water pump.
The leakage restraint system has the advantage that the coolant
escaping from the sliding ring seal (normal, functional leakage)
evaporates without a trace and cannot be mistakenly identified
as a water pump defect during visual inspections by the after-
sales-service.
