04 v70 2.4 suspension knock that isn't suspension?

Sub8 · Jul 15th, 2018, 13:58

Hi all. My V70 is driving me nuts!

I had / have a front suspension knock. Sounds just like a broken drop link or loose front roll bar. 100k miles.

I have just replaced both front lower arms, lower ball joint and struts with new top mounts.

No difference to knock.

I've taken both drop links off. No difference.

So..... Any other ideas out there?

Do the subframe bushes have issue on these?

reggit · Jul 15th, 2018, 14:03

Check exhaust heat shields haven’t cove adrit, assuming there’s one in the area. Had all the back end apart on my last v70 for a drop link type noise and eventually traced it to the heat shield.

BarryCambs · Jul 15th, 2018, 15:32

If it's predominant at low speeds, check the track rod ends too.

Mac940 · Jul 15th, 2018, 16:46

Lower gearbox mount possibly. Worth checking track rod ends as someone mentioned and while there also have a look (listen) at inner track rods.
PS. Since you replaced ball joints just check if everything is still nice and tight. The hub bolts on the ball joint may loosen if ball joint is not seated properly

oragex · Jul 15th, 2018, 19:53

The subframe bushes can go bad. Support a corner, remove the beefy bolt and look for wet bushing. But I'm not saying it will knock, maybe put some piece of rubber at the washer and drive some more.

While there make sure the two 14mm bolts one the rear subframe bracket are tight (try not to jack the car on this bracket as it may cause these bolts to loosen up)

davebb · Jul 15th, 2018, 22:05

Quote:

Originally Posted by oragex

The subframe bushes can go bad. Support a corner, remove the beefy bolt and look for wet bushing. But I'm not saying it will knock, maybe put some piece of rubber at the washer and drive some more.

While there make sure the two 14mm bolts one the rear subframe bracket are tight (try not to jack the car on this bracket as it may cause these bolts to loosen up)

all I can say is ice cream
Dave

davebb · Jul 15th, 2018, 22:09

Quote:

Originally Posted by Sub8

Hi all. My V70 is driving me nuts!

I had / have a front suspension knock. Sounds just like a broken drop link or loose front roll bar. 100k miles.

I have just replaced both front lower arms, lower ball joint and struts with new top mounts.

No difference to knock.

I've taken both drop links off. No difference.

So..... Any other ideas out there?

Do the subframe bushes have issue on these?

look at the engine mount on the right , under the main pulley,
people miss this one,
Dave

oragex · Jul 15th, 2018, 23:26

Quote:

Originally Posted by davebb

all I can say is ice cream
Dave

haha nice, I hope that video was not too weird

Quote:

Originally Posted by davebb

look at the engine mount on the right , under the main pulley,
people miss this one,
Dave

True, this mount can go bad especially after playing (lowering) with the subframe for some reason.

davebb · Jul 15th, 2018, 23:59

That ice cream looked good, I need some,
I changed my right hand mount today, as I have been having some clonking some times with the car on idle, my 2002 D5 has done 81,000miles
what I found is there was some play and when you move it from side to side the rubber bar inside will hit the sub frame and there is marks/outline of the rubber bar on the sub frame were it has been knocking on it, so I hoe that was the thumping/knocking that I could here ,I hope it is not my DMF,
I have already changed the gear box torque mount, and have had to change the top mount when I got the car at 56,000 for the new shape one and had to change it last year as well as the rubber was braking up, none gen, but this right hand one maybe why? the right hand one is also none gen, I will keep my fingers crossed
Thanks Dave

Sub8 · Jul 16th, 2018, 10:51

Well thanks guys.

One of the outer track rod ends is new. No obvious play when I jack the wheels and do the 3 / 6 o'clock test on either side.

Replaced the lower two piece gearbox mount already. This didn't knock but caused a drivetrain vibration felt through the steering when the torque converter opened.

I think a sub frame knock would be more pronounced, more lower frequency?

It totally sounds like knackered drop links / roll bar bushes - but as I say I`ve removed the droplinks with no effect.

I can pry and shake around the engine / subframe with no knocks.

Thing is it feels like a suspension issue as even with new arms / bushes
& struts the ride quality is still not great. Still feels `jaring` rather than smooth.

Jul 15th, 2018, 13:58	#1
Sub8 New Member Last Online: Nov 25th, 2023 12:04 Join Date: Jun 2016 Location: Kent.	04 v70 2.4 suspension knock that isn't suspension? Hi all. My V70 is driving me nuts! I had / have a front suspension knock. Sounds just like a broken drop link or loose front roll bar. 100k miles. I have just replaced both front lower arms, lower ball joint and struts with new top mounts. No difference to knock. I've taken both drop links off. No difference. So..... Any other ideas out there? Do the subframe bushes have issue on these?

Jul 15th, 2018, 14:03	#2
reggit Premier Member Last Online: Today 07:56 Join Date: Feb 2012 Location: Preston	Check exhaust heat shields haven’t cove adrit, assuming there’s one in the area. Had all the back end apart on my last v70 for a drop link type noise and eventually traced it to the heat shield. __________________ 2009 Volvo V70 D5 (Polestar 225bhp) r-design 180,000 miles

Jul 15th, 2018, 16:46	#4
Mac940 Member Last Online: Jun 10th, 2020 20:13 Join Date: Mar 2016 Location: Glasgow	Lower gearbox mount possibly. Worth checking track rod ends as someone mentioned and while there also have a look (listen) at inner track rods. PS. Since you replaced ball joints just check if everything is still nice and tight. The hub bolts on the ball joint may loosen if ball joint is not seated properly __________________ Last edited by Mac940; Jul 15th, 2018 at 16:48.

Jul 15th, 2018, 19:53	#5
oragex Premier Member Last Online: Jul 26th, 2021 21:24 Join Date: Jun 2013 Location: Coldnada	The subframe bushes can go bad. Support a corner, remove the beefy bolt and look for wet bushing. But I'm not saying it will knock, maybe put some piece of rubber at the washer and drive some more. While there make sure the two 14mm bolts one the rear subframe bracket are tight (try not to jack the car on this bracket as it may cause these bolts to loosen up) __________________ Several Volvo Repair Videos https://www.youtube.com/playlist?lis...ECTts0FSVSOT_c

Jul 15th, 2018, 15:32	#3
BarryCambs Senior Member Last Online: Aug 17th, 2023 14:13 Join Date: Oct 2011 Location: Cambridge	If it's predominant at low speeds, check the track rod ends too.

Jul 15th, 2018, 23:59	#9
davebb Premier Member Last Online: Apr 17th, 2024 19:02 Join Date: Aug 2013 Location: Emsworth,hants	That ice cream looked good, I need some, I changed my right hand mount today, as I have been having some clonking some times with the car on idle, my 2002 D5 has done 81,000miles what I found is there was some play and when you move it from side to side the rubber bar inside will hit the sub frame and there is marks/outline of the rubber bar on the sub frame were it has been knocking on it, so I hoe that was the thumping/knocking that I could here ,I hope it is not my DMF, I have already changed the gear box torque mount, and have had to change the top mount when I got the car at 56,000 for the new shape one and had to change it last year as well as the rubber was braking up, none gen, but this right hand one maybe why? the right hand one is also none gen, I will keep my fingers crossed Thanks Dave

Jul 16th, 2018, 10:51	#10
Sub8 New Member Last Online: Nov 25th, 2023 12:04 Join Date: Jun 2016 Location: Kent.	Well thanks guys. One of the outer track rod ends is new. No obvious play when I jack the wheels and do the 3 / 6 o'clock test on either side. Replaced the lower two piece gearbox mount already. This didn't knock but caused a drivetrain vibration felt through the steering when the torque converter opened. I think a sub frame knock would be more pronounced, more lower frequency? It totally sounds like knackered drop links / roll bar bushes - but as I say I`ve removed the droplinks with no effect. I can pry and shake around the engine / subframe with no knocks. Thing is it feels like a suspension issue as even with new arms / bushes & struts the ride quality is still not great. Still feels `jaring` rather than smooth.

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