Torqueing the Wheel Nuts on an Aston Martin DB9

Torquing a Road Wheel on an Aston Martin DB9There are lots of reasons you might Torque the Wheel Nuts on  your DB9, but its anytime you’ve had a wheel removed or perhaps you are getting ready for a track day and should double check they are properly torqued.  I can tell you there is absolutely a wrong way to do it – just using an impact wrench and hammering them on until the gun stops turning.    Read on to learn the right way.

Tools

Craftman 22mm Deep Socket
22mm 6-point Socket

You don’t need many tools for this task:

Procedure

Its simple with just a couple of details to follow:

  • If you’ve had the wheel off the car, please check out the tips in my other video on Installing a Road Wheel.  I think it’s easiest to torque the wheel nuts when the car is firmly on the ground so the wheels can’t spin.
  • I’d suggest that you use the masking tape and put a wrap of it around the outside end of the socket where it could possibly touch the rims.  This will help protect from scratching the rim.
  • Aston Martin warns against tightening the wheel nuts with the wheels hot.  For example don’t torque them right after a track day session.  They will be over tightened when cooled, and could cause a failure.
  • You need to Torque the wheel nuts in TWO (2) phases.   We’ll tighten them all to 80 Nm (60 ft-lbs) in the first step, and then go over them a second time tightening them to their final spec of 135 Nm (100 ft-lbs).  This is clearly spelled out in the Official Aston Martin Workshop Manual (check out what they say here if you like).  [Note – most early cars like mine were fitted with 22mm wheel nuts.  If you have 21mm or Titanium wheel nuts that were included with the Sport Pack option there are different torque specs and check the document above] [Note – Aston Martin issued Service Bulletin SB170 in July 2005 noting special Torque settings for 74 cars from VIN 03358 to 03432 – Read the Service Bulletin here]
  • Wheel Nut Torquing Pattern for an Aston Martin DB9
    The order you should follow tightening the wheel nuts.

    You need to tighten them following a standard torqueing pattern for a five stud layout – which looks like crisscrossing a 5 point star.  If you just tighten them in a circle its possible to misalign the wheel with the hub (bad mojo).  Follow the pattern in the attached diagram (it’s easy).

  • When tightening, do so in one smooth stroke until the torque wrench just clicks, then move onto the next wheel nut according to the torqueing pattern.

This is a simple but really important process.  I’ve made a quick video so you can see how I did it:


If you are reading this you might also be interested in a few other posts and video’s regarding preparation I’ve done to make sure my tires and wheel are in tip-top shape to reinstall and torque up:

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