Mysterious knocking/rattle

Faults and Technical chat for the Volvo XC40
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kirsty_s2k
Posts: 284
Joined: Mon May 14, 2018 9:01 pm
Location: North West, England

Re: Mysterious knocking/rattle

Post by kirsty_s2k » Mon Aug 12, 2019 8:32 am

Botash1 wrote:
Thu Aug 08, 2019 8:30 pm
I'm describing it as a creaking at low speed and it hasn't bothered me much until I read these posts. Otherwise the car is excellent. I'll have it checked then post again
In the last week I've noticed a creaking noise I think from the front right - makes creaky noises when manoeuvring out of the drive and when going over speed bumps - very odd as it's only on 20,000 miles and 1.25yrs.
I think I'll wait to see if it develops further before a trip to the dealer as I've found my first visit I usually get fobbed off until issues get worse!
First Edition - Bursting Blue on 19" (no washers) - D4 AWD Auto - GOT!! Fri 18th May!!!!
(My other car is a 2002 Honda S2000 in Silverstone)


marobinson1977
Posts: 3
Joined: Sat Aug 24, 2019 11:14 am

Re: Mysterious knocking/rattle

Post by marobinson1977 » Sat Aug 24, 2019 8:52 pm

Just bought a new T3 Inscription. It rattles louder than a rattlesnake. Sounds like it's coming from the glovebox, dashboard area. Sometimes the A pillar too. Deeply annoying and spoiling an otherwise lovely motor.
T3 Inscription


ambirad
Posts: 1
Joined: Mon Sep 23, 2019 1:49 pm

Re: Mysterious knocking/rattle

Post by ambirad » Mon Sep 23, 2019 1:52 pm

Same issue here, received my new XC40 Momentum on Friday.
Immediately when driving / taking off at low speeds, 10mph+ - I hear this rattle noise.

Taking it in for a look, will update with the findings.


RaulSM
Posts: 3
Joined: Tue Nov 19, 2019 4:41 pm

Re: Mysterious knocking/rattle

Post by RaulSM » Tue Nov 19, 2019 4:46 pm

Same noise/rattle here, but only on temperatures above 25 degrees Celsius. Dealer checked the car, but didn't find anything wrong. Did someone find the rattle?

Regards,

RSM.


RaulSM
Posts: 3
Joined: Tue Nov 19, 2019 4:41 pm

Re: Mysterious knocking/rattle - FIXED !!!

Post by RaulSM » Thu Jan 09, 2020 8:51 pm

Warning: English is not my native language, so I will do my best to explain the origin and solution of the noise in the car.

After months of trial and error and taking the car to the dealer 3 times, I discovered that the noise is not coming from the back of the car as it seems, but from the front. To find out, I lubricated each rubber component of the front suspension one by one with a silicone based spray oil. When it was the turn to lubricate the upper suspension mount, the noise increased dramatically.

I waited until the silicone oil had dried, and applied a motorcycle chain lube and the noise finally disappeared. Now it's been 2 weeks totally free of noise.

I attach a photo where I indicate with a red arrow the points where the lubricant should be applied, which corresponds to the drainage of the upper suspension mount. I also indicate with green arrows where the entire visible rubber contour should be lubricated. It is important to use a motorcycle chain lubricant that is compatible with oring chains, so that the suspension rubber is not degraded. I used a Liqui Moly "KettenSpray" which is liquid when applied, so it can get in between the little spaces, but then it dries out. If someone thinks it's necessary, I can post a picture of the lubricant I used.

Lube.jpg

I will also let the dealer know the source of the problem so they can check it more thoroughly and determine if any suspension components need to be replaced or if lubrication is sufficient.

I hope this will help someone solve this problem, as it almost drove me crazy.

Regards,

RSM.


RaulSM
Posts: 3
Joined: Tue Nov 19, 2019 4:41 pm

Re: Mysterious knocking/rattle

Post by RaulSM » Thu Jan 09, 2020 8:54 pm

I almost forgot, I also re-tightened the 3 nuts on the top suspension mount that you see in the picture above.


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