dan_189

Hi all,

I have a loud clunk from my front suspension when going over bumps at low speed. Dealership confirmed this as being worn thrust arms on the RH front and LH rear.

Ordered genuine replacements and they arrived this week. I have the factory manual but its fairly vauge around front suspension (for me anyway).

Few questions, the steps i'm planning to take for the front are:

1. Jack up car
2. Lower car onto front jack stand
3. Remove RH front wheel (will use air wrench)
4. Remove wheel well linings + under body linings?
5. Spray bolt in red with WD-40 and undo
6. Spray bolt on the other end and undo
7. Undo/loosen boomerang bracket to allow control arm out (saw a youtube video of a recommendation of this - below) shown below highlighted in green
8. Install new control arm to body/suspension sub frame (torque value?)
9. Install arm to coffin arm (torque value?)
10. Tighten boomerang bracket (torque values?)

Is the method/steps correct? Also is the procedure the same for the rear? It appears the rear arm to body uses a bolt and a nut whereas the front is only a bolt?

Part being replaced:


Torque values (confirmed)


Pelican parts diagram (what is the tightning torque of the bolt in red?):


Front parts diagram:


Rear parts diagram:


Youtube video of replacement on 986 (guy doesn't use a torque wrench and at one point uses his foot to push on the wrench! I don't know if I trust him!)


Any help would be appreciated, I guess I could just have a go but I don't want to have my car immobile in the garage!

Thought i'd also compile all the data/diagrams i've collected for this job in one thread too.

Thanks

Schnell Gelb

Did you read this?
http://www.pelicanparts.com/techarti...n_Overhaul.htm

dan_189

Thanks, I did but it's a bit vague on the replacement of this specific arm and the torque values.

steved0x

You can replace this arm in the front by jacking the car, removing the wheel, and removing only the two bolts on the arm, most likely without loosening the boomerang plate. Although now that I think about it, I may have done front sway bar bushings at the same time. I would try doing just the two bolts first.

Torque values

dan_189

Thanks, was your reply missing the torque values if you had them? I don't mind loosening the boomerang plate but have struggled to find the values of all the bolts.

steved0x

The bolt at the boomering end: 88 ft/lb
The nut/bolt at the center of the lower control arm: 118 ft/lb

I have a 986 Boxster so my corresponding arm in the back is different and takes 118 ft/lb on both ends - I don't have the manual for the 996 so I don't know the values for the back, but if it is the same arm in back as in front I am guessing they are the same.

dan_189

Excellent, thanks!
Do you have the values of the other bolts on the boomerang?

Youre correct, on the 996 the front and rear are the same part. 986 rear is 986 specific.
​​​​​

steved0x

Sorry my reply got cut off on my phone...

I only have the two sway bar bolt values on the boomerang, and I can't find them now, and I never did find the other end bolt on the boomerang. I think I have them in a PDF at work that I can check Monday, but I bet you can slide that end in and out without loosening the boomerang.

steved0x

And my work is just 1 mile up the road, I can slide up there and check tomorrow if you have to loosen the boomerang to get the arm.out.

dan_189

Thanks, I'll give it a go on the weekend and report back! I'll be happy if I can get at least the front done for now.

The rear looks like access to the bolt to the body could be limited.

Cheers!

Slakker

Front: You'll want to loosen the boomerang but the diagonals can stay. 118ft/lbs on both ends of thrust arm.

Rear thrust arm: 133ft/lbs to sub frame and 118ft/lbs to lower control arm. If I remember correctly, the bolt to the subframe can be challenging to get to. So allow a little extra time for it and be prepared to remove other pieces if required.

dan_189

Thanks slakker, the rear does look a little challenging especially because it's not just a bolt to the subframe it's a nut as well. Do you know the torque spec for the other bolts on the boomerang?

Slakker

It's 48 ft lbs for the 2 bolts covering the sway bar 74 ft lbs for the front bolt.

steved0x

My front torque specs came from.the 986 manual, that might be one of the differences up front between the 986 and 996. Slakker has a 996, I would use his torque values.

dan_189

Thanks everyone