Watch these Videos:
Part 1: Examples of the damage that can occur on several factory harmonic balancers.

Part 2: How to remove and install the harmonic balancer on the crankshaft.

MINI Cooper OEM Part Number:
11 23 7 525 135

Vehicles Effected:

• MINI Cooper (2002-2006)
• MINI Cooper "S" (2002-2006)
• MINI Convertibles (05-08)

MINI Cooper Harmonic Balancer Replacement Part 2 - click here to see how to remove and install the replacement vibration damper.
BMP Design Harmonic Vibration Damper with FluidGel Part Number 300635

Getting Started:
First you will have to remove the fender well housing on the car to get access to the crank pulley area at the motor. This will allow you to pull off and replace the harmonic balancer while it is on the car. This tech tip shows how it will not be neccesarry to pull out motor in order to pull off the pulley. Second, you will need to remove the damaged factory balancer pulley, and then install the BMP Design harmonic vibration damper with FluidGel as an aftermarket replacement to the factory part. Let's take a closer look below.

MINI Cooper and Cooper "S" Vibration Damper Pulleys: A Closer Look
At the work table we see the entire rubber damper has completely torn off along with the pulley on this early Cooper "S" balancer (top). The Mini Cooper Balancer Pulley (bottom) has a rubber damper layer pressed together inside the pulley. The rubber has broken away and the pulley has started to move back on the hub scraping the engine resulting in damage to both.

Later Model MINI Cooper "S" Balancer Pulley Damage:
On this later model balancer the damper rubber core has failed and the entire pulley has separated from the core allowing the crank shaft to spin, but the actual pulley, belt, supercharger, and water pump would not turn. On all of the pulleys there are (3) 6mm holes to attach the puller, but first the 75mm long crank bolt must be removed using a 1/2" ratchet with a 12mm socket.

MINI Cooper Harmonic Balancer Replacement Part 2 - click here to See How to Install the Replacement Damper