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Discussion Starter · #1 · (Edited)
Hi folks, hopefully some of you can point me in the right direction with this issue. The car is a 2008 xc70 3.2 Awd. I'm experiencing a grinding sound when the car is parked and put into reverse. It sounds like it's behind the dash or under the vehicle. Also, and I'm pretty sure it is related, I'm experiencing a similar more insidious noise while turning Right ( sometimes ). I can't say for sure if it's only full tilt to the right or almost, but it is NOT on mild right turns. If it's a wheel bearing, this is unlike any worn wheel bearing I've ever heard. Before I go jacking the car up shaking the wheel looking for wheel play, does this issue sound familiar to this platform volvo?

Could it be angle gear? axle? suspension components?

I just did a transmission flush and refill and found what looked to be brown or amber colored fluid on the transmission. I'm not sure if it was power steering fluid, engine or gear oil but it is NOT the vacuum pump seal as I replaced that this past Spring.

I'm attaching 2 videos.
I'll try to work that out and edit the post.
Thanks for any advice.
This first video is obviously parked. You can hear the grinding sound in Reverse (car is not moving).
https://vimeo.com/351949134
This second video is under slow to medium speed acceleration not quite full tilt to the right.
That deep sound towards the end is not exhaust.
https://vimeo.com/351949347
 

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Top vid sounds like either engine mount or either torque mount might either be bad or not tightened properly. I'd start looking into those and everything else that was loosened during trans replacement. Your leak could also be coolant as you have to remove the lower radiator hose and the large coolant pipe to the water pump. The seal on the coolant pipe can tricky to get into the water pump and I've seen them folded or cut.
 

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Discussion Starter · #3 · (Edited)
I'll look into the mount you mentioned. Not sure what the torque mount is but thanks for the info that might help narrow down my search.

As for the transmission, It wasn't replaced. I just did the fluid flush and refill today.
I'm skeptical that the mystery leak I have could be coolant because I did the thermostat and coolant flush this spring. The coolant is still bright blue.
The replacement I mentioned was the vacuum pump seal.

Edit with updated info:
We moved the gear shifter between park and reverse in this video with the engine running.
Initially I was unsure how much play the mount is supposed to have but after looking at it closer it looks worn.
We picked up a replacement at FCP Euro this morning.
https://vimeo.com/352119371
 

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Discussion Starter · #4 ·
ok so the lower mount is replaced and the vibration persists. https://vimeo.com/352400712


I'm going to replace the transmission mount under the battery tray. This one: https://www.fcpeuro.com/products/volvo-engine-mount-corteco-31316875

The torque strut mount doesn't look bad so I will save that for another time. This one: https://www.fcpeuro.com/products/volvo-engine-torque-strut-mount-corteco-31257674
The upper mount also looks good so I will save that for later as well: https://www.fcpeuro.com/products/volvo-torque-strut-mount-corteco-31430441

What I am looking for is the Torque rod. I can't locate it on the car and there is hardly any info I've been able to source online. this one: https://www.fcpeuro.com/products/volvo-torque-rod-corteco-31262935

Any ideas guys? am I going in the right direction here with replacing mounts or could it be something else?
 

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Discussion Starter · #6 ·
you're saying the one under the coolant reservoir? I have been under the impression that this mount is hydraulic and I do not see any leaks on the engine bay or the mount. It actually looks very clean.
The vibration which initially lead me to try to solve this has been from the right side but I think we all know that a vibration can travel from it's origin.
I'm learning as I go with this. At least all of my years of wrenching on VWs has gained me some basic mechanical skills.
I'm going out for parts this afternoon, I'll pick this one up also.
 

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31670126 is the Upper Torque mount. https://www.tascaparts.com/oem-part...mbz14YzcwJnk9MjAwOCZ0PTMtMiZlPTMtMmwtbDYtZ2Fz
Many times the large bushing portion cracks and has excessive movement. In those cases, check the engine mount beneath it as its a hydraulic mount that can rupture and loose fluid or just collapse. Other times the smaller bushing will make noise, usually on startup you hear a quick rattle noise if it its bad.
You may need to get a stethoscope to help pinpoint the noise.
 

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you're saying the one under the coolant reservoir? I have been under the impression that this mount is hydraulic and I do not see any leaks on the engine bay or the mount. It actually looks very clean.
The vibration which initially lead me to try to solve this has been from the right side but I think we all know that a vibration can travel from it's origin.
I'm learning as I go with this. At least all of my years of wrenching on VWs has gained me some basic mechanical skills.
I'm going out for parts this afternoon, I'll pick this one up also.
Yes the one under the reservoir. If it is hydraulic mine didn't show any leakage. I too started with replacing the lower mount with no change.
 

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Discussion Starter · #9 · (Edited)
Thanks for the replies guys. I just finished replacing the transmission mount 31316875 ( the one under the battery )
The car vibrates less in reverse now. I'm planning to do the upper mount under the coolant reservoir tomorrow for good measure.
If the vibration persists still, I will replace the upper torque mount. It looks to be very straightforward.

Update: I replaced the upper mount (under the coolant reservoir). It appeared fine with no leakage on or under it but it leaked hydraulic fluid when I shook it.
While the transmission mount replacement gave me less engine vibration, the upper mount has seemed to solve the issue.
I did not replace the upper torque mount and still can't find the location lower torque mount.

I had expected a mess if this mount was bad, but the engine bay in this area is quite clean.


very easy to install.


comparison of new and old.
 
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