[Sc0tty]

Hi everyone,

I've had this one a while and I can't seem to find any answers, I've even had my clutch replaced in an attempt to resolve it.

When depress my clutch at high revs (4.5k and up) I get a rattling almost scraping kind of sound. This happens without touching the shifter, so I assume that my gearbox etc is fine? As the engine noise is fairly loud at high revs, the volume of the rattle or scraping is roughly the same, if anything a bit lower. The noise lasts for a couple of seconds and the falls of and stops, evidently as the revs drop again.

However, when the car is stationary and revved and then depress the clutch there isn't any rattling or scraping.

Any thoughts? I really would have thought the new clutch, clutch release bearing (i think the master slave cylinder was changed to from memory) would have sorted it.

Help!

 

[jrak123]

I had the same sound and it turned out the my differential was broken.

 

[Sc0tty]

Expensive? Big job?

 

[jrak123]

Well at this point it would be best to install a quaife Limited slip dif. and yes it is a big job it requires removal and disassembly of the trans.

 

[Sc0tty]

I thought that if the diff was broken then the handling would be awful on corners as the power wouldn't be distributed as it should be and it would be making an awful crunching noise all the time?

 

[jrak123]

I am just going by what my expereance was. It is a little tough to diagnose a sound that I can't hear. You seem to know enough about cars so I am just gonna make suggestions of stuff to check.

Have you checked the conditon of your trans fluid?
How about wheel bearings? They have been known to make some strange noises, other than the typical thump, thump, thump.
Brake pads? If they are bad they can make noise at higher speeds and go away when braking. Sounds strange but none the less it's true.

Have any young kids you can fit under the hood while you drive? Maybe they can find it? j/k
Anyhow there is a few things to go with.

 

[Sc0tty]

Thank you for the suggestions, this one is really annoying me as I can't seem to crack it and I'd really like to have a close idea to what it is before the mechanics get a hold of it and I start losing lots of money.

I don't know about the condition of the fluids, brake pads are recently new (3 months'ish). It's at times like this that I wish I was a mechanic, that way I could just get stuck in!

 

[jrak123]

I feel your pain my friend, fortunately I have been working on cars for years, I am at the point where I don't trust anyone to look at my car. I just do it my self. But in all honesty if you take the time to step back and look at the situation mechanical things are pretty simple you just need to take your time.


1 other suggestion, put your car up on jack stands, start it up and put it in gear and get out and listen for noises maybe it will help you locate it. Sorry I can't be much more of a help to you. Best of luck! Cheers:beer:

 

[Sc0tty]

Don't blame you on not trusting people!

Sadly, with it not being an easy one, the noise only occurs when I depress the clutch whilst the car is moving (edit - do'h car is front wheel drive and would not go anywhere on jacks! Sorry, was not with it yesterday!) and under high revs.

A beer certainly sounds good to sit back and think with! Thank you for your help.