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Discussion Starter · #1 ·
Hello all

Just wondering if anyone has replaced their Subframe bushing, my interest is to know:

1. what would be the cost (labour, parts, etc.)?
2. Is it worth it? any handling/driving improvement

PS. I have 2007 XC90 V8 Sport with ~187K KM
 

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2008 XC90 3.2
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The BIGGEST concern of replacing front subframe bushings or adding subframe bushing inserts are the forward 2 bolts. They get rusted to where upon removal, those two forward bolts break inside the threads. Has happened to me and several other people in this forum. I see you are Ontario so you are not immune to the harsh elements that cause rust.

My suggestion is if you plan to change the subframe bushings, do the rearwards first. Those forward bolts could add another $600-$1,000 to the labor cost because they will most likely break based on your climate. If your XC90 lived most of its life in Arizona, then I would have different suggestions. You could try adding subframe bushing inserts to the rearward bushings and see if that improves the handling to your liking. Don't forget to use new subframe bolts.
 

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If the subframe bushings are cracked or broken, replace them. If the bushings are not broken, do poly inserts. Use new subframe bolts if they come off (torque to yield) and purchase new plastic washers- PN 31329447, they'll be smooshed and cracked by now.

For your V8, check the top engine mount (stabilizer bar to engine) and replace if it's anything close to original, then consider poly inserts for the stabilizer bar bushings (with or without new bushings). Check the rest of the mounts, especially the lower torque rod (back bushing likes to break).

DIY subframe bushing replacement looks like this- https://forums.swedespeed.com/showthread.php?306441-Subframe-bushing-replacement-questions, bushing insert looks like this- https://blog.fcpeuro.com/how-to-replace-volvo-subframe-bushing-inserts, stabilizer bar insets look like this- https://www.ipdusa.com/products/503...tabilizer-poly-bushing-kit-ipd-110933-8666204

Both of my vehicles have had these inserts installed for a couple years now with no complaints.

**Per the comment above on front bolt, do a decent soak of penetrating oil from the top and go in/out on the threads a few times and re-soak before removal.
 

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**Per the comment above on front bolt, do a decent soak of penetrating oil from the top and go in/out on the threads a few times and re-soak before removal.
Those forward bolts, when vehicles are in winter/salt prone regions it takes much more than simple penetrating oil. Do NOT underestimate the rust. In the thread pockets, there will be dirt, salt (if used in your area), and water. They stay there. So, if you only use penetrating oil twice, the oil will get soaked up by dirt or blocked by water. It takes cleaning somewhat the threads from the top, then spraying multiple days penetrating oil, then use heat like the torches used in the shops. Those bolts might not turn one bit, but if you break them, the entire subframe might need to be dropped to extract them.

Another thing to consider, sometimes the forward bolts seem to loosen. In reality, it is the bolt twisting. So, you don't know the bolts are gonna break and you definitely don't want to leave a twisted bolt inside.

Check out this problem:
https://forums.swedespeed.com/showthread.php?595653-XC90-Sway-Bar-Replace
https://forums.swedespeed.com/showthread.php?598385-Broken-Subframe-Bolt
https://forums.swedespeed.com/showthread.php?373865-Odd-Issue-with-Subframe-Bolt
https://forums.swedespeed.com/showt...about-installing-IPD-subframe-bushing-inserts


So, IMHO, do the rearward bushings or bushing inserts and see if that will satisfy your needs first. If you want to move to the forward bushings, prepare yourself for the potential cost in labor and having your vehicle out of commission for several days.
 

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Reasonable assessment above, you decide if it's worth removing the bolts or not.
 

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Discussion Starter · #6 ·
Those forward bolts, when vehicles are in winter/salt prone regions it takes much more than simple penetrating oil. Do NOT underestimate the rust. In the thread pockets, there will be dirt, salt (if used in your area), and water. They stay there. So, if you only use penetrating oil twice, the oil will get soaked up by dirt or blocked by water. It takes cleaning somewhat the threads from the top, then spraying multiple days penetrating oil, then use heat like the torches used in the shops. Those bolts might not turn one bit, but if you break them, the entire subframe might need to be dropped to extract them.

Another thing to consider, sometimes the forward bolts seem to loosen. In reality, it is the bolt twisting. So, you don't know the bolts are gonna break and you definitely don't want to leave a twisted bolt inside.

Check out this problem:
https://forums.swedespeed.com/showthread.php?595653-XC90-Sway-Bar-Replace
https://forums.swedespeed.com/showthread.php?598385-Broken-Subframe-Bolt
https://forums.swedespeed.com/showthread.php?373865-Odd-Issue-with-Subframe-Bolt
https://forums.swedespeed.com/showt...about-installing-IPD-subframe-bushing-inserts


So, IMHO, do the rearward bushings or bushing inserts and see if that will satisfy your needs first. If you want to move to the forward bushings, prepare yourself for the potential cost in labor and having your vehicle out of commission for several days.
Great feedback, many thanks for sharing your thoughts, definitely will take it in the consideration

Any thoughts if replacing the bushing would improve the ride?


Sent from my iPhone using Tapatalk
 

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I installed the inserts into the good bushings on my 3.2 and didn't have any kind of "WOW" reaction. I'm not sure there's a detectable difference, but it did't hurt (?). I don't know what I was looking for, though.
My car came from the Florida and South Carolina area via a stint in Las Vegas, and I then bought it in Los Angeles. When I removed the front bolts, they came out OK, along with some surprising amount of black water. In your case, I would definitely heed the advice about taking your time and multiple passes with penetrant. I would go a step further and suggest you look up "best penetrating oil" and grab a beer for the you tube entries. Some are really well done.
 

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As far as improving ride or handling, I noticed improved steering after my inserts. My XC90 also spent most of its life on city streets, so there is always a sharp 90-degree turn coming. Plus add the potholes affect on the bushings. I see the inserts helping improve the life of the bushings since there will be less flex of the rubber.

The ride may not improve, but it could be more direct in feel and turn-in. If you have a V8 with more weight than the 2.5t and 3.2 I6, then you might see more of an improvement. When doing the inserts along with replacing the other front-end wear parts, it makes for a nice complete handling package.
 

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After burning through multiple tires and failed alignments, i have discovered that my xc90 is a victim of Carfax fraud. The "minor rear collision" that "required only minor cosmetic repairs" actually bent my rear subframe beyond the possibility of alignment. I have to go to a junkyard and get another rear subframe, mount new bushings and install it. I have not been able find detailed post where someone has done this.
Can anyone tell me for sure that besides wiring and brake lines that its just 4 bolts to remove the subframe from the rear of the xc90? Anyone have pics or details of a full rear subframe removal??
 

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Search here for rear differential replacement. The subframe has to come down for that.
 
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