Mini Cooper Strut Springs Or Lowering Spring Installation

How to Install or Replace Mini Cooper Suspension Springs or Lowering Springs

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Installing worn or broken spring can bring back new life to your Mini Cooper as well as help with performance.  If your looking to change or replace your suspension springs to lower your car or to increase performance this guide will help take you through the process step by step.

Tools Needed:
13mm, 16mm, 18mm, and 21mm standard sockets; 21mm strut socket BMW # 31 2 210 (Hazet)
Long 6mm & 5mm Allen wrenches, 5mm Allen socket
16mm box end wrench, 17mm open end wrench
Long breaker bar
Dead blow or rubber mallet
Torque wrenches to accommodate 22 ft-lb to 103 ft-lb values R50-53, 121 ft-lb for the R56.
Tools to install Mini cooper springsMore tools needed for Mini Cooper Lowering Springs

Equipment Needed:
Auto jack or lift
Vehicle stands

Alternative Tools:
Spring compressor
Air ratchet
Impact wrench and 21mm thinwall deepset socket

Lift the Vehicle and place on stands, remove the wheels, pull the front brake lines and ABS/pad sensor wire off the strut, and disconnect the stock drop link from the strut using a 16mm socket for the nut and a 17mm open end wrench to hold the bolt from behind the mount. The drop links shown during the spring install procedure are aftermarket that requires a 14mm socket and 13mm open end wrench.
Remove Mini Cooper Strut
Remove the pinch bolt with an 18mm socket, using a breaker bar to loosen and a ratchet to remove. R56 Models have a ribbed flare nut on the end of the bolt, loosen the bolt head only.
Mini Cooper S Removing StrutMini Cooper Strut BoltMini Cooper Lower Spring Bolt
Apply lubricant to the lower end of the front strut where it enters the steering knuckle.
Lubricate Mini Cooper Steering Knuckle
Place a stick on the jack’s lift pad and use as leverage under the lower spring perch to compress the spring and push the strut out of the steering knuckle. A few taps with a dead blow hammer may be needed to break it free. Exercise cautions if a hand is needed to stabilize the strut, do not place the hand or fingers between the strut & stick or any place where it could be trapped if the strut shifts abruptly.
Loosen Mini Cooper Strut
R56 models will not require compression of the spring.
MINI R56 Spring and Strut
Unscrew the guide support nuts while grasping the strut, once freed, lower the strut carefully feeding past the brake line and wire then remove outward and upward from the wheel well.
Mini Cooper Strut Support Nuts
Remove the bearing dust cap and place the strut on its side. Use a block of wood to leverage the Allen wrench and body weight to leverage the strut shaft nut using the special 21mm strut socket on a long breaker bar. This can be performed with the strut upright but it requires much upper body strength. Unscrew the top nut until the nylon lock has cleared the shaft threads(A spring compressor is highly recommended during this procedure!).
Mini Cooper Suspension Bearing Dust Cap
Without a spring compressor (A spring compressor is highly recommended during this procedure!) the nut can be removed safely using the “buddy method”. As a partner applies weight on the guide support, unscrew the last remaining threads, the partner releases pressure smoothly, and off comes the upper mount. justintime (seated) and simplekid15 (standing) demonstrate how it’s done.
Mini Spring Compressor Nut
A spring compressor will provide stability and facilitate removal if the install is performed solo.
Mini Cooper Spring Compressor
The Mini Cooper R56 models have a nylon stud on the guide support, removing the nylon piece allows the guide support to shift a little, providing an extra half degree negative camber if desired.
Mini R56 Strut TowerR56 Mini Extra Camber
After the replacement spring has been installed and the strut shaft nut tightened to 47 ft-lb, feed the strut into the strut tower, guiding the bolts through their mounting holes, while still grasping the strut, screw on the guide support nuts by hand to hold the strut in place then complete the fastening with a ratchet and torque to 25 ft-lb. For R56 models with the nylon stud removed, push the strut towards the engine to increase negative camber, before securing the nuts.
Mini Camber Cheat
Clean the pinch bolt threads with brake cleaner and a wire brush; afterwards apply a small amount of anti-seize. The pinch bolts are exposed to oxidizing elements; anti-seize will help prevent a frozen bolt that could shear when attempting to extract.
Mini Cooper Strut Pinch Bolt 1Mini Cooper Strut Pinch bolt 2
Place a block of wood on the jack lift pad and raise the steering knuckle from under the outer ball joint nut. Mini Cooper S R56 location shown here.
Cooper S r56 Steering Knuckle
Install and torque the pinch bolt to 60 ft-lb. On R56 models, after inserting the bolt hand tighten the end nut, apply torque to the bolt head only.
Install Mini Cooper Pinch Bolt
Torque the drop link to strut body at 41 ft-lb.
Strut Drop Link

Be sure to place the drop link behind the strut to avoid making this mistake; oops.
Incorrect Drop link postition
Return the brake line and ABS wire to their strut body mounts and replace the bearing dust cover cap to declare the front strut has been completed; yippee!

Moving to the rear strut, remove the anti-sway bar drop link.
Mini Cooper Anti-Swaybar to droplink
Pull the brake line & ABS sensor wire from the strut body.
Cooper ABS and Brake Lines

Unscrew the bolts on the strut’s upper mount using a 13mm socket.
Upper Mount Strut Bolts
Loosen the lower strut bolt with a 21mm socket and breaker bar, attach a ratchet to unscrew, grasp the strut before removing the bolt completely to keep it from dropping and remove the strut.
Mini Lower Strut Mount Bolt
Remove the strut shaft nut with a 16mm box end wrench and long 5mm Allen wrench. A spring compressor can be used on the stock springs but the H&Rs had to be installed using the “buddy method”.
Rear Spring and strutsBuddy Method spring install

Torque the shaft to 22 ft-lb using a 5mm Allen socket on a torque wrench in the reverse position while holding the nut with a 16mm box end wrench.
Installing Mini Cooper Strut assembly
As with the front pinch bolt, clean the rear strut lower mount bolt and apply a small amount of anti-seize. Lift the strut into place under the vehicle and guide the lower mount bolt into place. Screw the bolt in until tight but don’t apply complete torque at this time.
Lower rear strut bolt
Clean the upper mount bolt threads and apply a small amount of anti-seize. Raise the trailing arm with a jack and position the top of the strut within the chassis recess, line-up the upper mount holes and install the bolts, torque to 41 ft-lb.
H&R Mini Cooper Lowering Springs
Torque the lower strut mount on R50-53 models to 103 ft-lb; R56 models to 121 ft-lbs
Torque Lower Mini Cooper Bolts SuspensionLower rear spring install Mini Cooper
Put the brake line and wire in their strut brackets, replace the lower bolt dust cover if your model has them, remount the wheels, torque the lug bolts at 89-92 ft-lb. for R50-53 models, 103 ft-lbs for R56 models, lower the vehicle.

Now go Get an Track Or Street Alignment!

Original Post from the Lone Star Mini Club by k-huevo at the Lone Star Mini Club

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