Car mechanic query

[jordan1]

Found this under the middle of our Renault Scenic today, obviously fallen off, anyone know what it is, looks like a sensor of some kind???. Heavy, rubber covered.

 

[keithski122]

Vibration damper off something?

 

[the snooper]

Looks like a rubber cushion that would stop an axle hitting the chassis when the springs are fully compressed

 

[BrokenBiker]

its not a sensor, no wires or plugs to connect to it...may be a rubber bump stop as snooper says. look underneath for a relatively clean area the same shape as that bit and you should find where it goes

 

[rikrobson]

Had it fallen off or was it there before you parked over it?

It could be it's just running away from the rest of the terrible Frenchness.

To be honest I wouldn't worry about it.

 

[BrokenBiker]

is yours the sceneic that is similar shape to my megane (the shake that ass shape) or the earlier one? if its similar to my megane then i cant find anything in the underbody view diagrams i have that matches that at all...if its an earlier model i dont have info to hand about those. it doesnt look like something that will cause problems by not being there...its probably a good thing...now there is less french to go wrong on it

 

[jordan1]

It has a metal core, weighs over 500g and fits in the palm of your hand. The car is 5yrs old.
In the secong picture there looks to be possibly a wire broken off below the surface??

 

[normspanners]

Anti vib balance lump/ harmonic damper possibly?
usually on suspension axles--- x/members etc to stop harmonic vibration or panel flex at certain speeds it makes me laugh they make cars lighter and lighter but then they rattle, so they stick on massive weight's
around the cars to stop it vibrating. Thus piling totally unnecisary weight on again, why not just make them solid in the first place.

 

[the snooper]

Anti vib balance lump/ harmonic damper possibly?
usually on suspension axles--- x/members etc to stop harmonic vibration or panel flex at certain speeds it makes me laugh they make cars lighter and lighter but then they rattle, so they stick on massive weight's
around the cars to stop it vibrating. Thus piling totally unnecisary weight on again, why not just make them solid in the first place.

If they made them solid they wouldn't rust away causing heavy
Lumps to fall off

 

[jordan1]

It has groves part way down each side where it has been pushed in a cage/housing. The rubber is only a thin skin to protect the core from the elements. I'll call in at the garage that does our servicing to be sure.

 

[the snooper]

It has a metal core, weighs over 500g and fits in the palm of your hand. The car is 5yrs old.
In the secong picture there looks to be possibly a wire broken off below the surface??

are you sure its from your car ? it could have bounced under there from a passing car, they don't usually fall off 5 year old cars

 

[cumbriasteve]

If it had not had the rubber backing I would have first guessed at the metal backing plate off a disc pad with a wear sensor.

 

[normspanners]

If it had not had the rubber backing I would have first guessed at the metal backing plate off a disc pad with a wear sensor.

How thick does a brake backing plate need to be? thats as thick or thicker than it is rectangular by the shadow it is forming I am guessing 100 mm x 60 x 80???

 

[grim_d]

It's a comfy bit that's full of wee.

Where'd that come fae? Wheeeeeeeee in the bin.

 

[cumbriasteve]

How thick does a brake backing plate need to be? thats as thick or thicker than it is rectangular by the shadow it is forming I am guessing 100 mm x 60 x 80???

Got to disagree on this one

5mm at most, shadow caused by a distant low lamp, we need better photos.

EDIT: Just seen the 500g weight mentioned, looks like I may be wrong

 

[the snooper]

Got to disagree on this one

5mm at most, shadow caused by a distant low lamp, we need better photos.

EDIT: Just seen the 500g weight mentioned, looks like I may be wrong

I think you are Steve considering it is is laid on its side in one picture and stood on its end in the other

 

[cumbriasteve]

Ah... I thought it was a front and back shot.. Back to the drawing board it is

 

[jordan1]

are you sure its from your car ? it could have bounced under there from a passing car, they don't usually fall off 5 year old cars

It was in my drive, deffo from my car.

 

[colnerov]

The car is 'self- lightening' to maintain performance as it gets older and tired.

 

[Kent]

Anti vib balance lump/ harmonic damper possibly?
usually on suspension axles--- x/members etc to stop harmonic vibration or panel flex at certain speeds it makes me laugh they make cars lighter and lighter but then they rattle, so they stick on massive weight's
around the cars to stop it vibrating. Thus piling totally unnecisary weight on again, why not just make them solid in the first place.

because cars are made by accountants and marketing people not engineers