Water Pump Service Kit, Rein - E82 135i, E9X 335i (N54)

This package includes a new electric water pump (all aluminum version), thermostat, related hoses, and hardware for the N54 engine in E82 135i and E9X 335i -

• Water Pump, Aluminum Version (#11519455978)
• Replacement water pump screws (not re-usable) (#11517602123)
• Thermostat (#11537549476)
• Transfer hose (#11537545665)
• Cylinder Head to Thermostat Hose with upgraded flange (#11537541992)
• Lower radiator hose (#17127564480)
• Elbow hose on water pipe (#11537558523)

Replace your BMW's electric water pump BEFORE it experiences catastrophic failure! This is an upgraded all-aluminum version, designed and built with mechanical longevity in mind. 

BMW changed to an electric pump to reduce emissions and make the engine more efficient. Pumps driven from the main drive belt used up fuel which made for more emissions. Electric pumps only work when they are needed and only require the alternator to supply power. Because the engine computer regulates engine temperatures, the water pump only needs to work when it has to (including after the car has been turned off). In theory this should make the pump last longer. But it's the electronics inside that fail and will force a replacement, often without warning. Depending on operating conditions the engine may go into limp mode and require a tow! Although if you are religious about oil changes and checking/clearing fault codes you may get a soft (hidden) code for low water pump output ahead of time.

Engine coolant can be ordered using the related options below, if needed.

All parts are manufactured by Rein (CRP) Automotive - an original supplier to BMW for many various BMW parts. As an OEM Rein strives to meet all of BMW's original design, fitment, and performance requirements. OEM-type parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.

This is a kit assembled by Rein Automotive and contains most of what is replaced with the water pump and thermostat but it may not include every part that could be replaced at the same time. Contact us if you have other items in mind to replace.