Torque specs/socket (wrench) size for suspension/powertrain
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This is a discussion on Torque specs/socket (wrench) size for suspension/powertrain within the Powertrain forums, part of the Tutorials & DIY category; This will be a guide to most of the undercarriage suspension/powertrain torque specs. I think it's a good idea to ...

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    Torque specs/socket (wrench) size for suspension/powertrain

    This will be a guide to most of the undercarriage suspension/powertrain torque specs. I think it's a good idea to go thru these prior and after track sessions (or as part of an annual maintenance program). Things do shake loose, especially after time or stress.

    I use rhino ramps- allows me to get to all the "front" bolts/nuts and then in the rear for the back stuff. Most of your suspension stuff needs to be torqued under load ie on ramps, so this accomplishes this requirement.

    A couple of other things, many of the rear components are difficult (or impossible) to get to w/ a torque wrench- these you will have to use your best judgement on how to (and how much) to tighten. Many can best accomplished by doubling up w/ combination wrenchs for more leverage. I like to use 6 point stuff (including combination wrenches) for most of the bigger stuff, less chance of rounding off a nut/bolt off.

    I use two torque wrenches- a 1/2" drive for the bigger stuff (60 ft lbs +) and a 3/8" for the smaller stuff (under 60 ft lbs). I use the Craftsman digi torq models as you simply dial in the torque number looking into a small viewer. You will appreciate (and need) a assortment of extensions.

    IMPORTANT!!! I've tried to carefully edit all of the specs, if you see any that are wrong please let me know. Also note these are from the Impreza 2002 service manual- other models/years may differ.
    Attached Thumbnails Attached Thumbnails torquewrenches.jpg  
    Last edited by Big Sky WRX; 09-26-2004 at 03:05 PM.

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    We'll start up front w/ the cross member, four bolts 17 mm, 74 ft lbs
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    front control arm (transverse link) bushing 17 mm, 75 ft lbs
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    The rear control arm bushings 19mm 184 ft lbs- these are tough as you can imagine, you can do these w/ the subframe on- there is a hole where you can get to the bolt
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    the ball joint/knuckle bolt 14 mm, 37 ft lbs
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    Front strut lwoer bolts 19 mm 129 ft lbs
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    We'll get the subframe next up front two 12 mm bolts 25 ft lbs
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    Then three 17mm bolts on each side 41 ft lbs
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    And finally two 14mm bolts each side- 52 ft lbs
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    Front sway bar mount (you won't be able to hit these w/ the subframe on) just make sure they are firm- 12mm 20 ft lbs
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    Front sway links- sedan 33 ft lbs top/bottom (if they won't tighten it's becasue you'll need a 5mm hex wrench to hold the bolt) wagon is 33 ft lbs bottom, 23 ft lbs top
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    get the steering rack mounts 14mm 43 ft lbs
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    engine mounts 14 mm 63 ft lbs
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    front brake mounts 17 mm, 59 ft lbs
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    Tranny mounts- the front cross member 17 mm 103 ft lbs
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