Overview

This guide goes through the steps we used to remove and re-install the wheels on a 1987 Ferrari Testarossa with single wheel nuts. For our car, the wheel nuts were really stuck on tight. It took us a number of attempts, specialty tools, and consultations with mechanics who have worked on these cars. There are a number of horror stories of the wheel nut coming loose while driving, resulting in the wheel coming off. Therefore, doing this correctly to insure the driver/passenger's safety and the safety of others was paramount. As always, this was just our experience and what has worked well for us - each situation may be different.

One of the most difficult issues we encountered when removing the wheels, was preventing the wheel from spinning (even with the car on the ground). In the end, one of us applied and held the brake pedal with the car running. Since we were removing the wheels to replace some old, under performing brake pads, the brakes had difficulty preventing the wheels from spinning. A combination of wood for wheel chocks and using an angle less than 45° to the ground ended up working (thank goodness).



Tools Used

Tool Link
Quick Jack BL-5000XL portable lift Amazon
Jack Stands Amazon
Hill Engineering Testarossa Wheel Socket Ricambi
3/4" Drive Breaker Bar Amazon
3/4" Drive Torque Wrench1 Amazon
Torque Multiplier (1:3)2 Amazon
1" Female to 3/4" Male Drive Adapter Amazon
Extension Pipes for Leverage HomeDepot

1 Yes, this 3/4" drive torque wrench does fit in the front trunk of the Testarossa.

2 This style of torque multiplier was the one that worked for us. Torque multipliers (like this torque multiplier) did NOT work.



Procedure Used

Removal:


1. Before attempting anything, we found the direction in which the nut must be turned to be loosened. Each of the octagonal wheel nuts have an arrow showing the direction to LOOSEN the nut. The direction to loosen is also the same direction as the forward rotation of the wheel [1][2]. For the left side it should be counter-clockwise, and the right side clockwise. Ferrari Testarossa single wheel nut direction to loosen
2. Next, we put painters tape on the wheel nut and duct tape on the inside of the Hill Engineering wheel socket. This worked well to preserve the finish of the nut. We also had a few moving blankets on hand to protect the body work if something slipped. Ferrari Testarossa single wheel nut taped to prevent scratching of the wheel nut
3. After many trials, the figure to the right was the final setup that worked for us. We placed the Hill Engineering wheel socket on the wheel nut, attached the 1" female to 3/4" male drive adapter and placed a jack stands under it for support and to keep the socket level (see image to the right). We then attached the torque multiplier to the adapter. Put an ~8' long extension pipe over the reference bar coming out of the torque multiplier. Finally, we used the 3/4" drive breaker bar with a ~4' long extension pipe as the input to the torque multiplier. Ferrari Testarossa single wheel nut removal with torque multiplier
4. With the car running, one of us applied and held the brake pedal (for the front wheels, this person also held the steering wheel from turning). To remove the nut, we then applied force to the end of the ~4' long extension pipe. It was important to insure that the extension bar created no more than a 45° angle with the ground, such that the force was applied downwards toward the ground to loosen the nut. We also used some scrap wood to help prevent the wheel from spinning.
5. After the wheel nuts had broken loose, we lifted the car off the ground to prevent any unnecessary pressure or damage to the wheel and hub.

Re-Installation:

For the re-installation, we roughly followed the methods described in the owner's manual for a Porsche 918 Spyder, since the Testarossa's Owner's manual merely says to "tighten as much as possible" and to complete the tightening of the nut to 325 lbs ∙ ft [1][2].


1. We used a QuickJack to lift the car off the ground. The car must be lifted high enough such that the wheels are off the ground. Ferrari Testarossa on the QuickJack BL-5000XL portable lift
2. Next, we placed the wheel on the car while insuring that the wheel is flat against the hub. The wheel nut was then hand tightened.
3. With the car still off the ground and running, one of us applied and held the brake pedal (for the front wheels, this person also held the steering wheel from turning).
4. Using the 3/4" drive torque wrench, we tightened the wheel nut in the direction opposite to the forward wheel rotation to the specified torque of 325 lbs ∙ ft. Tightening Ferrari Testarossa single wheel nut with a torque wrench
5. Next, we loosened the wheel nut 1/4 of a turn.
6. We repeated Steps 4. and 5. at least one more time. The reason Steps 4. and 5. are done repeatedly, is to insure that the wheel is seated flush against the hub. If the wheel is not flush with the hub, the wheel will wobble when driving and possibly come off.
7. We tightened the wheel nut to 325 lbs ∙ ft one last time while the car was still off the ground.
8. After repeating Steps 2. - 7. for each wheel, we then lowered the car to the ground. While on the ground, we checked that all of the wheel nuts were tightened to 325 lbs ∙ ft.
9. Finally, we did a series of short drives, pulling over (when safe) to check that all of the wheel nuts were still tightened to 325 lbs ∙ ft. We did a 1/4 mile drive, a 1 mile drive, and finally a couple of miles with a couple decent accelerations and braking. In between each "drive," we checked that all of the wheel nuts were still tightened to 325 lbs ∙ ft. For the next few uses of the car, we checked the tightness of each of the wheel nuts with the 3/4" drive torque wrench before and after each drive.


References


  1. Ferrari S.p.A. Spare Parts Catalogue - Testarossa. Ferrari S.p.A., 1990.
  2. Ferrari S.p.A. Owner's Manual - Testarossa U.S. Version 1987 Models. Ferrari S.p.A., 1987.
  3. Ferrari S.p.A. Owner's Manual - Testarossa U.S. Version 1985/85 Models. Ferrari S.p.A., 1985.
  4. Ferrari S.p.A. Workshop Manual - Testarossa. Ferrari S.p.A., 1984.