New Generation N62 Engine Chapter 3 P.64
Course Contents/Background Material
© BMW AG, Service Training
Fig. 49: Leakage restraint system in the water pump
The water pump has a leakage restraint system for the functional
leakage from the pump shaft piston ring type seal. The coolant
which escapes through the pump shaft sliding ring seal usually
accumulates here and evaporates through a hold in the leakage
chamber (evaporation area).
If the sliding ring seal is faulty, the leakage chamber fills
completely with coolant. Sliding ring seal leakages can be
detected by monitoring the fluid level in the leakage chamber
(inspection hole)
Index Description
1 Impeller
2 Sliding ring seal
3 Leakage chamber/evaporation space
4 Leakage chamber cover
5 Delivery from the sliding ring seal to the leakage chamber
6 Hub for pulley and viscous clutch
KT-8138
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