Reverse Loud Knock

[H4RRY]

Hi everyone,

I've read all the threads I can find on knocks, and there seems to be many, but I haven't found the answer I need yet so I was wondering if anyone had any ideas.

When in reverse, if you move backwards you hear a loud knock. If you stop reversing and reverse back again without moving forwards it won't do it. If you pull forward again and then backwards it will make the knock again. If you pull forward agressively and then back it will make it even louder.

I know mounts are always mentioned but I have checked the top engine mount (to the left of the engine), the top gearbox mount (under the battery), the lower gearbox mount and the dog bone and they all look fine.

Any ideas would be much appreciated.

Thanks in Advance!
Harry

 

[Tony172]

Possibly driveshaft I'd check them first!

 

[H4RRY]

Thanks Tony, I'll take a look at them.

I have to find it, its driving me insane already and I've only had the car a week! lol

 

[MartinR]

exhaust mounts

 

[H4RRY]

exhaust mounts

Possibly, just sounds like something more solid if you know what I mean.

 

[MartinR]

when the exhaust mounts are fubared it can cause the exhaust to hit the rear beam

 

[Joe R26]

If you manage to get this sorted I'd be interested!. I have a very similar problem!

When I lift my clutch to biting point in reverse its a very severe thud inside the car. Its not like metal to metal noise though.

 

[Tony172]

If you manage to get this sorted I'd be interested!. I have a very similar problem!

When I lift my clutch to biting point in reverse its a very severe thud inside the car. Its not like metal to metal noise though.

sounds like engine or gearbox mounts, possibly dogbone mount!

 

[Joe R26]

I'm going to order the dog bone and gearbox mount and I'll update the thread if it sorts out the problem.

 

[mugglesquop]

I'm going to order the dog bone and gearbox mount and I'll update the thread if it sorts out the problem.

why not check then first?

/facepalm

 

[H4RRY]

Thought I'd update everyone.

I've changed the lower Gearbox mount as its the only one that looked like it could possibly be causing the problem and that hasn't done it. I had the dogbone mount off but it looks fine. I've tried shifting the engine back a bit as there was some mention of manifolds catching in some cases on here. I have had a big tug around with all the joints and drive shafts around each front wheel and nothing. One of my front suspension struts looks like its seen better days but I'm not convinced it could be that. Im praying it isnt gearbox, but I can't see how it can be because there is no problem changing gear and it just doenst feel like it can be the box.

If anyone has any more ideas, please let me know...... Also how do you know if the dogbone mount has gone? I was convinced it was that to start with but it looks in good condition all round.

 

[H4RRY]

I'm going to order the dog bone and gearbox mount and I'll update the thread if it sorts out the problem.

Did you get these parts. Any luck?

 

[H4RRY]

If you manage to get this sorted I'd be interested!. I have a very similar problem!

When I lift my clutch to biting point in reverse its a very severe thud inside the car. Its not like metal to metal noise though.

That does sound very similer by the way, does it do it repeatedly? As in if you reverse, stop, and then reverse again does it do it? Mine only does it when you reverse for the first time and then won't do it again untill you've gone forwards and then reverse again (if that makes any sense).

I don't know whether you get this also but I've also now noticed that the front wheels. especially the front left, almost seem to click when it makes the noise.

 

[Joe R26]

Maybe my problem is different. Mine does it repeatedly in reverse. Also sometimes when changing gear.

I've got a new gearbox and dog bone mount now. Hoping to get them on today

 

[l0rd]

I had a similar issue on my 1995 clio RSi. One of the rear pads retaining clips was missing.

It used to push the pad out from the disc and knock on the alloy when reversing.


Just my thought

 

[H4RRY]

Maybe my problem is different. Mine does it repeatedly in reverse. Also sometimes when changing gear.

I've got a new gearbox and dog bone mount now. Hoping to get them on today

Let me know how you get on please. That Dog Bone mount is still a possibility in my mind.

I had a similar issue on my 1995 clio RSi. One of the rear pads retaining clips was missing.

It used to push the pad out from the disc and knock on the alloy when reversing.


Just my thought

Thanks for the thought, I just can't see it being at the rear, sounds like engine bay or under the front of the car.

 

[Joe R26]

Replaced the two mounts and there's no change!

Starting to think it's something expensive now lol.

I've got it booked in to a specialist in the morning. Their going to have a look for me.

 

[Joe R26]

Well I hope your problem is different to mine lol.

The specialist I took it to said he couldn't find the problem. He doesn't think it's the drivers side mount. He thinks it could be the diff in the gearbox but would need to investigate some more.

So looks like mines going to be expensive!

 

[H4RRY]

Well I hope your problem is different to mine lol.

The specialist I took it to said he couldn't find the problem. He doesn't think it's the drivers side mount. He thinks it could be the diff in the gearbox but would need to investigate some more.

So looks like mines going to be expensive!

I may have found it!!!!

If you can get your car back, take the drivers side (O/S) driveshaft off. The splined tubed that attaches the spline of the driveshaft to the spline of the gearbox was almost worn smooth on the gearbox side and has obviously been jumping teeth. Probably worth a quick look on yours before you start trying expensive fixes, you don't even loose any gearbox oil so not going to cost you anything to check.

Take a look at my other thread I just started, got some pics on there of the part.

http://www.cliosport.net/forum/showthread.php?617071-Anyone-know-what-this-piece-is-called

Hope that helps!!

 

[Joe R26]

You sir are a legend.

I hope my problem is the same! As it will save a lot of money!

I will pull mine out tomorrow I think

 

[Joe R26]

Whats involved in removing it?

 

[H4RRY]

ha ha, it hasn't definitely solved my problem yet and we aren't sure if its even an issue on yours so don't congratulate me just yet.

To take the driveshaft off I did the following, but if my instructions are crap, I used a few threads on here for some tips, just do a search around.

- Centre cap of alloy off
- loosen the central nut that holds the driveshaft to the hub before taking the alloy off (just makes it easier)
- Jack up car and alloy off
- undo the central nut all the way
- undo the two bolts holding the ball joint to the wishbone
- under the car undo the five bolts holding the driveshaft to the bracket and the bracket to the block
- and pull.... HARD!! Mine, did not want to come off, it took me pulling it and my mate hitting it from underneath with a hammer.

I hope thats it for you! And we will then both have the adventure of hunting down that part.

Let me know how it goes.

 

[Joe R26]

cool. thanks for the info. Let me know how you get on.

Well done for perserveering too, i had given up looking for the problem and accepted it was the box.

With a bit of luck. this is the problem.

 

[H4RRY]

ha ha, thanks.... I refused to be beaten by a french car!!

I just couldn't see it being box, and I probably just didn't want to believe it was box for my wallets sake lol.

Anyway I'm going to pop into Renault tomorrow and see if they can get me one, I'll let you know how I get on.

Good luck!

 

[Joe R26]

Thanks man appreciate that. Could always try and source a second hand one off of someone breaking a clio on here if all else fails.

 

[H4RRY]

Right, I've sourced a brand new one. Let me know if thats your problem and I'll get you their phone number.

It was a bit pricey, £55 with next day delivery but a new driveshaft is like £130 from euro. You can get a second hand driveshaft for around £60 but I wasn't sure what condition that spline would be in so thought it would be best to get a new peice instead.

 

[Joe R26]

Ok mate thanks. I'm practically there but the fucker won't come out at either end! Lol.

And it's started raining

 

[Joe R26]

I managed to get it off the gearbox end but I'm not sure its worn enough to cause problems. I'll get some pics up and see if it looks any worse/better than yours does.

 

[Joe R26]

IMG_0148 by JoeRS182, on Flickr

IMG_0149 by JoeRS182, on Flickr

IMG_0152 by JoeRS182, on Flickr

How does mine compare to yours?.

 

[Joe R26]

Harry, Could you take a photo of each end of your one so I can compare it?.

 

[H4RRY]

I'll try and get a photo up for you tomorrow but the best way to tell is if you can pull that sleeve off the driveshaft as well you should be able to see a clear difference. Mine was perfect up to half way where it had been attached to the driveshaft and it was almost flat on the side of the gearbox. You could see a clear line in the middle where it went from splined to smooth.

Also I got that part delivered today and fitted it and .......... NO NOISE!! That was it!

 

[H4RRY]

But from your pics it doesn't look great, so it looks like that could be your problem too, take it off like I said above and it should then be obvious how bad it is. It won't come off the driveshaft very easily though.

 

[Joe R26]

Glad to hear its sorted. I think I'll order one aswell. Mine does look shot in the pics. I'm guessing the teeth should be sharp and triangular they seem to be more oval.

Thanks for sending me the details.

 

[H4RRY]

Glad to hear its sorted. I think I'll order one aswell. Mine does look shot in the pics. I'm guessing the teeth should be sharp and triangular they seem to be more oval.

Thanks for sending me the details.

No worries, let me know how you get on.

 

[Joe R26]

Contacted the guy today. Seems quiet knowledgable. Parts on its way to me

 

[H4RRY]

Contacted the guy today. Seems quiet knowledgable. Parts on its way to me

You get the part then? Did it work?

The suspense is killing me! lol

 

[Joe R26]

I've got the new part today. Looks much much better than my one. As you can see on my previous pics the teeth are practically non existant. Not nice and sharp like on the new part. I'm confident this will fix it but I wont know untill the weekend. What was your method of getting the part off the end of the driveshaft?.

 

[Joe R26]

New

IMG_0164 by JoeRS182, on Flickr

Old

IMG_0149 by JoeRS182, on Flickr

 

[H4RRY]

I've got the new part today. Looks much much better than my one. As you can see on my previous pics the teeth are practically non existant. Not nice and sharp like on the new part. I'm confident this will fix it but I wont know untill the weekend. What was your method of getting the part off the end of the driveshaft?.

Lots of wd40 and a hammer lol.

And yeah I bets that's your problem. Good luck!

 

[Joe R26]

So there's no hope of getting it off without removing the driveshaft from the car? I've got a puller I could try on it mind you.