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[Tafty]

I changed my front wheel bearing yesterday and thought that I was in for a bit of piece and quiet but no

The wearing noise from the front has gone - happy days!! but this has also been masking a further noise coming from the rear end.
Have noticed a bit of a scratchy type noise coming from under the middle of the car every time I blip the accelerator of late and a reduction in this noise every time I push the clutch in. So today have had the car up on my new stands (ace they are - ta for the recommendation  ) and with all the following disconnected/slackened off to reduce the friction noises to try and isolate :- handbrake, rear pads and rear discs - but the grinding noise (2 actually) appears to be coming from around the diff area and not the rear bearings. One noise is from the output shafts of the diff and the other higher pitch scratching/grinding noise is coming from the input shaft.  Diffs are beyond my capabilities (I think) so since I don't have a bottomless pit of money am putting it into Vauxhall for an investigation first, on Monday morning - can anyone maybe shed any light before I potentially lose a fortune at the stealers?

cheers

Lee

[hotel21]

It does have oil in it, doesn't it???    :-/

[Tafty]

It does have oil in it, doesn't it???    :-/

I thought they where sealed and required no topping up - I have no oil leaks - never have - and the car sits on the drive a lot in the same spot without any residue - will check it though - any easy way other than dropping the front of the case off??

[sassanach]

try undoing the level plug on the side(8mm allen key)

[Tafty]

try undoing the level plug on the side(8mm allen key)

Checked that - although was a little too close to the level plug when I openned it - started dripping on my face - so plenty of oil in there then It's very smooth too - not gritty.

This is a pic taken from MDTM diff oil change guide - whats the likelyhood of these bearings going duff? Cause that's what the noise seems to sound like  :-/ Am assuming mine is a non LSD unlike the pic but not sure.

[Tafty]

*BUMP*!!!!!!  Just to keep it on the first page - am assuming everyones been out on the sauce tonight - quite rightly so too

Anymore takers for my diff issue???

[Mike Collins]

Debris trapped between abs sensor and toothed wheels?

[TheBoy]

probably better finding a diff off breaker, and swapping over...

[Tafty]

probably better finding a diff off breaker, and swapping over...

How straight forward a job is this?

[mv6copcar]

I changed my front wheel bearing yesterday and thought that I was in for a bit of piece and quiet but no

The wearing noise from the front has gone - happy days!! but this has also been masking a further noise coming from the rear end.
Have noticed a bit of a scratchy type noise coming from under the middle of the car every time I blip the accelerator of late and a reduction in this noise every time I push the clutch in.
cheers

Lee

if the noise changes when you dip the clutch i wouldn't have said its the diff. as the diff will always spin while the car is moving,as will the prop,etc. so try the thrust bearing in the box first? check the gearbox mounting as the prop goes through it and can rub on the rubber part of the mounting(sit directly under the gear sick) a good diff isn't easy to get hold of, a LSD is rocking horse s*** :0

Good luck

[Tafty]

I changed my front wheel bearing yesterday and thought that I was in for a bit of piece and quiet but no

The wearing noise from the front has gone - happy days!! but this has also been masking a further noise coming from the rear end.
Have noticed a bit of a scratchy type noise coming from under the middle of the car every time I blip the accelerator of late and a reduction in this noise every time I push the clutch in.
cheers

Lee

if the noise changes when you dip the clutch i wouldn't have said its the diff. as the diff will always spin while the car is moving,as will the prop,etc. so try the thrust bearing in the box first? check the gearbox mounting as the prop goes through it and can rub on the rubber part of the mounting(sit directly under the gear sick) a good diff isn't easy to get hold of, a LSD is rocking horse s*** :0

Good luck

Have been right underneath the diff and the grinding noise is definately around that area, though can't be too sure that the noise isn't transmitting through the shaft.  Am going to let the experts decide what's wrong with it but not looking forward to the prognosis I can tell you that much - even less the quote to repair  

[sassanach]

how are you checking for this noise? ie are you jacking the car up on the diff and spinning the wheels?

[Tafty]

how are you checking for this noise? ie are you jacking the car up on the diff and spinning the wheels?

I'm jacking the car up one side at a time - am reluctant to support the car on the diff - doesn't look right!!! and spinning the freedup side by hand - it's then you can hear at the diff itself a low pitch grinding noise.  The other scratchy type noise I get when I'm changing gear on the go. I'm now convinced there is definately two issues on the go here. Am also not going to risk the car on the drive to Spain in 3 weeks time - I can see a financial repair bill disaster looming if I subjected the car to that type of journey at the mo - So hiring an MPV instead  Hopefully this will be a straight forward repair by Vauxhall but are they ever?? Getting depressed now.

[Tafty]

how are you checking for this noise? ie are you jacking the car up on the diff and spinning the wheels?

I'm jacking the car up one side at a time - am reluctant to support the car on the diff - doesn't look right!!! and spinning the freedup side by hand - it's then you can hear at the diff itself a low pitch grinding noise.  The other scratchy type noise I get when I'm changing gear on the go. I'm now convinced there is definately two issues on the go here. Am also not going to risk the car on the drive to Spain in 3 weeks time - I can see a financial repair bill disaster looming if I subjected the car to that type of journey at the mo - So hiring an MPV instead  Hopefully this will be a straight forward repair by Vauxhall but are they ever?? Getting depressed now.

How quiet should a diff be when you move it free hand???

[sassanach]

the noise your getting from the diff sounds normal the way you are checking it. what you are doing is spinning the internal gears which allow the car to go round corners. but you do have a thrust washer/spigot    bearing issue with the cog-box