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  #11  
Old 08-30-2019, 06:46 PM
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That's why I was planning to inject from the side


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  #12  
Old 08-30-2019, 09:05 PM
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Bushings in a can - DIY Rear Sub Frame bushings repair

Just replace the bushings, the tool is like $60 and and the bushings are only $130 for 4 Lemforder units. All in the job is under $200.
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Old 08-30-2019, 09:11 PM
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I think the chances of getting a good repair by injecting urethane pretty slim and you will need at least 2 holes from the side. Have a look at what a new bushing looks like and consider that it needs to support an keep alignment on 2 axis.
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Old 08-31-2019, 12:07 PM
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Especially if the bushing has collapsed. You are then locking in poor geometry. I could see if you did it with new bushings. Or with smaller ones where you could observe and jack a component into position to fill and set. (Have done this on Subaru differential support bushings)
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Old 08-31-2019, 12:20 PM
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Quote:
Originally Posted by jcp240z View Post
Especially if the bushing has collapsed. You are then locking in poor geometry. I could see if you did it with new bushings. Or with smaller ones where you could observe and jack a component into position to fill and set. (Have done this on Subaru differential support bushings)
Great point. That's exactly the situation and what I addressed when fixing the torque arm on my Cayenne engine. When bushings like this fail, they typically deform into a displaced rest state that is off-center, even when the load is removed. I somehow clamped the bushing so it was centered while the 3M Windo Weld had time to solidify.

On the other hand, here, just how bad is it to "lock in poor geometry" for these bushings? Maybe not so bad as it might be in other bushing applications???
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Old 08-31-2019, 04:04 PM
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These rear sub-frame bushes can't really collapse as such - they just tear and allow too much movement under acceleration and braking, resulting in clunks etc. if you jack the sub-frame and body seperately, you can align the bush correctly.

But in this position, there's no room to inject anything.

I'm not against this DIY as a concept - I've repaired engine mounts this way myself in the past - but I'm not sure the rear subframe bushes are a good candidate.

Dropping the entire sub-frame work give good access but is a lot of work....
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Old 08-31-2019, 04:11 PM
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Just went back and re-read the OP post at the start of this thread and I guess what he suggests (remove only the bolts and lower plate) would work ok, especially if you jack the car via the rear sub-fame. This should hold the bushes under load (supporting the body!).

One issue is still going to be getting at the rear holds - the exhaust hanger is an obstacle.
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