ES#4364734 - 11-AM-UOPSK - Upgraded Oil Pump Shaft Kit - M50/M52 S50/S52 - Avoid oil pressure loss and engine failure with this simple kit! - Achilles Motorsports - BMW

Upgraded Oil Pump Shaft Kit - M50/M52 S50/S52

Avoid oil pressure loss and engine failure with this simple kit!
Mfg Part #
ECS Part #
Availability: Expected Ship Date: in 2 Business Days
Does this fit my vehicle?

Product Details

The early M5X engines have well-documented issues caused by harmonics. The extreme vibrations cause the weak oil pump shaft to shear off or the oil pump nut to come loose and fall off, all of which results in an instant loss of oil pressure. Achilles Motorsports decided to develop a solution to fix all of these known issues.

Achilles takes their oil pump shafts to the extreme, using only the toughest materials and heat treatment processes to ensure optimum strength. The core of this kit is a hardened Chromoly shaft that is centerless ground to ensure absolute trueness. The shaft is engineered with an exclusive square key lock system that not only prevents the gear from ever spinning on the shaft but also adds strength to the area to which the gear mounts. Achilles Motorsports then replaced the pesky oil pump nut with an extended length bolt that is EDM drilled for safety wire to properly secure it for all conditions. Don't wait for your oil pump to fail and leave you stuck with costly engine repairs!

Key Features:

  • Hardened Chromoly centerless ground shaft
  • EDM Drilled Bolt with a piece of safety wire included
  • Grade 8 extended length hardware to secure the gear to the shaft
  • Left hand threaded to prevent it from unexpectedly coming loose
  • Double-D keyed shaft and drive gear
  • 100% serviceable & rebuildable without the need for grinding.

NOTE: Professional installation required! The shaft requires being pressed into the oil pump's inner rotor.

This Part Fits the Following Vehicles

Make Model Submodel Engine
BMW E34 525i M50 2.5L
BMW E36 325i M50 2.5L
BMW E36 325ic M50 2.5L
BMW E36 325is M50 2.5L
BMW E36 323i M52 2.5L
BMW E36 323ic M52 2.5L
BMW E36 323is M52 2.5L
BMW E36 328i M52 2.8L
BMW E36 328ic M52 2.8L
BMW E36 328is M52 2.8L
BMW E36 M3 S50 3.0L
BMW E36 M3 S52 3.2L
BMW E39 528i M52 2.8L
BMW Z3 2.3 M52 2.5L
BMW Z3 2.5 M52 2.5L
BMW Z3 2.8 M52 2.8L
BMW Z3 M Coupe S52 3.2L
BMW Z3 M Roadster S52 3.2L
*The above product applications have been written by ECS Tuning. All warranties, product application, fitment, and performance are the responsibility of ECS Tuning. For additional information see the terms of use.


ECS Tuning is not affiliated with any automobile manufacturers.
Manufacturer names and/or part numbers are used only for identification purposes.

Terms of Use Privacy Policy ECS Tuning is part of Enthusiast Auto Holdings