Occasional, metallic knock at low speed at rear

Bodywork & Interior problems
RoadKnight
Posts: 25
Joined: Mon Aug 17, 2015 12:13 am

Re: Occasional, metallic knock at low speed at rear

Post by RoadKnight » Mon Oct 16, 2017 5:05 am

I am quoting from a copy of the Nissan dealer's work report that was submitted to Nissan for the dealer's warranty claim on Nissan.

Do you have access to the Nissan Technical Bulletin database? I can imagine that this database is not in the public domain as Nissan may not want other car manufacturers having access to it.


RoadKnight
Posts: 25
Joined: Mon Aug 17, 2015 12:13 am

Re: Occasional, metallic knock at low speed at rear

Post by RoadKnight » Mon Oct 16, 2017 5:42 am

Before we all get too excited by body flex in the QQ, it is worthwhile considering that all car bodies flex to some extent due the forces that are applied to the chassis as a car travels along a road. There is a short piece on this on Wikipedia: https://en.wikipedia.org/wiki/Body_flex

There are also lots of items posted from owners of many makes and models of cars complaining of noises resulting from body flex in their cars. There is a fairly comprehensive list of car body flex indices listed here: http://youwheel.com/home/2016/06/20/car ... sive-list/. Unfortunately the QQ is not rated. From my understanding the number is the amount of force that needs to be applied to create a defined amount of flex (deflection) in a car body - the higher the number, the more rigid the body.


switchback
Posts: 277
Joined: Sun Dec 27, 2015 3:08 pm
Location: East Anglia

Re: Occasional, metallic knock at low speed at rear

Post by switchback » Mon Oct 16, 2017 8:52 am

fat controller wrote:
Sat Oct 14, 2017 6:15 pm
I am hoping not - surely if it were the rear axle, it wouldn't have passed an MOT?
Not an MOT issue. It's something to do with the twist beam axle internals..........I think.
2015 1.6 dci Tekna, AWD.


Daewar
Posts: 491
Joined: Wed May 25, 2016 6:58 pm

Re: Occasional, metallic knock at low speed at rear

Post by Daewar » Mon Oct 16, 2017 11:35 am

I remember many moons ago jacking up one side of my Mk2 Ford Escort & then opening the door to find it jamed due to the body twisting. I've tested this on just about every car I have owned & all since I can remeber are so rigid the doors can open when the car is jacked up on one side. Most modern cars are very rigid compaired to cars of the past.
RoadKnight wrote:
Mon Oct 16, 2017 5:42 am
Before we all get too excited by body flex in the QQ, it is worthwhile considering that all car bodies flex to some extent due the forces that are applied to the chassis as a car travels along a road. There is a short piece on this on Wikipedia: https://en.wikipedia.org/wiki/Body_flex

There are also lots of items posted from owners of many makes and models of cars complaining of noises resulting from body flex in their cars. There is a fairly comprehensive list of car body flex indices listed here: http://youwheel.com/home/2016/06/20/car ... sive-list/. Unfortunately the QQ is not rated. From my understanding the number is the amount of force that needs to be applied to create a defined amount of flex (deflection) in a car body - the higher the number, the more rigid the body.
2016 1.6 dci Tekna, AWD.


fat controller
Posts: 190
Joined: Tue Aug 25, 2015 7:22 pm

Re: Occasional, metallic knock at low speed at rear

Post by fat controller » Mon Oct 16, 2017 6:36 pm

@switchback - is it purely a noise problem, or is this a safety related issue also?
1.5dci Acenta Premium
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