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steveoz
Monza


Joined: 21 Mar 2011
Posts: 162



PostPosted: Tue Mar 22, 2011 11:36 am    Post subject: 996 : Replacing rear suspension Reply with quote

The rear turret isn't hard to remove and inspect / replace or refurb, but it's a bit of a pig to replace seeing as the rear shocks take around 70 kilos before they even start to compress at any reasonable rate.

This means that even with the spring compressed, if you mount the strut inside the car, you can't compress the shock upwards to get back inline with the hub. The only solution for the DIYer or for me at least was to use a spare jack with a block of wood to jack the strut up, and then guiding it in with a flat blade or pry bar.

First, I lifted the car, removed the wheel and then pulled up the ECU / Relay board cover in the back of the car ready to remove.

I then jacked the hub to take pressure off of the drop link, you just jack the hub up until the drop link is even and has no weight on it.



Use a socket and spanner to undo the drop link, it should just pull out easily with your hand:



Loosen and start to undo the pin that holds the strut on the hub:



You'll need a spanner on the back to stop it from rotating:



You can compress the spring if you like at this stage. What you see below is bad practice so I'll post the pic so you can see what happens, you can see I only compressed one side, the spring expands on one side when you do this and distorts, it can often not even result in the spring being freed since one side expands, the spring compressor can easily 'pop off' as well I did this at my own risk. Now strictly you don't need to compress before taking off, as unlike the front, it should just drop down, you can then fit compressors evenly off of the car, it was early hours at this point and I was a bit tired though...:



Go back inside the car and mark the bolts - I marked one closest the ECU board with black paint on the top of the bolt so I knew the alignment. Remove bolts from mounting plate, once this is done remove pin:



Inspect threads and condition to re-use:



Remove strut with rubber mallet or wood by pressing back away from the hub:



Support strut and remove:









Remove top cap with spanner and grips on the key to stop the shaft from spinning (decent grips that won't round off the key on the top of the shaft, either that or the correct tool - I've made one for this). Keep the top cap and spring pointing away from you, you don't want a compressor slipping and this firing into you (has happened to me before on other projects).



Remove components (inspect the top cap and rubber mount before removing to ensure you are familiar with the orientation and how they slot back together):



Clean, rebuild / replace parts as required and re-assemble:



Re-compress spring, then line up and insert strut (with correct bolt you marked in the original position to keep the orientation) supporting underneath with a jack - this will allow you to go inside the car and pop the three nuts back on to hold the strut there (only put them on a few threads so the strut can still be manipulated).



On the next part I placed a jack with block under the strut and placed a long flat blade from the back of the hub to the bottom of the strut to guide it in the right place as I compressed the shock. You'll need to give it a jiggle when it gets close with your hands to work it in.

Regrease and replace pin:



Check mounting and seating of spring at the top and then remove compressors and all done:




Cheers,
 
  
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