Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Black Knight on 12 March 2009, 13:04:40

Title: Rear Diff - Now with photos
Post by: Black Knight on 12 March 2009, 13:04:40
Hi,

Had a rather annoying whining sound from the back end. Though it was the autobox but it's much further back and I've topped up the box fluid this morning, well...mainly poured it over myself...but there you go!

Could it be the brake shoes sticking? Don't get the noise on 'P' or 'N' but do hear it as soon as you pull away.

p.s it did have rear pads in about 1K ago.
Title: Re: Brake shoes
Post by: Jimbob on 12 March 2009, 15:30:25
Is the diff pinion seal leaking at all?

the diff can whine if low on fluid.
Title: Re: Brake shoes
Post by: Black Knight on 12 March 2009, 16:10:58
Is that what sits at the back end and sets the drive to the wheels??

I did notice a little oil there, amongst other places. i'll jack it up and see if I can get a pic tommorrow morning.


Big job??
Title: Re: Rear Diff - Now with photos
Post by: Black Knight on 13 March 2009, 06:33:22
Ok, here are some photos taken at 6am this morning! Neighbours must think i'm crazy!

I've never noticed any oil dropped where I park it or anywhere else. The noise could well be the diff and it's clearly leaking oil but I'm not sure how bad a case that is compared to others??

Is it a similar top up to the gearbox sump?

What is the correct oil to use?

(http://img.photobucket.com/albums/v420/Stealthdog/RHdiff.jpg)
(http://img.photobucket.com/albums/v420/Stealthdog/LHDiff.jpg)
(http://img.photobucket.com/albums/v420/Stealthdog/Under2.jpg)
Title: Re: Rear Diff - Now with photos
Post by: MutantCav on 13 March 2009, 08:36:28
There is a filler plug somewhere on it...I will have to have a look at the LSD one sat in my garage to see where it is...looks like its leaking quite badly,might need to get the seals sorted at some point...

Might not be any fluid on your drive if its all leaked out lol SAE 90 is what you need for the diff unless you have an LSD :y
Title: Re: Rear Diff - Now with photos
Post by: unlucky alf on 13 March 2009, 08:41:35
 i would have thought perhaps EP90 oil would be nearer the mark to be honest but dont quote me as im not 100%, but cant imagine a diff running on atf ;) ;)
Title: Re: Rear Diff - Now with photos
Post by: unlucky alf on 13 March 2009, 09:05:46
just had a look in the haynes book & it lists sae 90 for top ups [unless you have LSD] in which case its a special oil from vx apparently :y
Title: Re: Rear Diff - Now with photos
Post by: MutantCav on 13 March 2009, 09:10:13
Quote
SAE 90 is what you need for the diff unless you have an LSD :y
Thats what I said! lol  :y
Title: Re: Rear Diff - Now with photos
Post by: unlucky alf on 13 March 2009, 09:17:30
sorry mutant, im still waking up & my typing is too slow as im eating readybrek at the same time, readybrek used to be good to quieten the diffs on 1.6 cortinas ;D ;D ;D
Title: Re: Rear Diff - Now with photos
Post by: jjleonard on 13 March 2009, 09:43:03
AHA! My mig is doing exactly the same thing - whining frm the rear, with increasing pitch the faster I go.

I'd better jack the back up and have a look - at least I now know what i'm looking at.  :y

EDIT: Diff oil change guide is here: http://www.omegaowners.com/forum/YaBB.pl?num=1161520937
Title: Re: Rear Diff - Now with photos
Post by: Black Knight on 13 March 2009, 10:47:37
Thanks all, a picture does paint a thousand words, how did we ever get on before the digital age. Oh yeah, the boys learnt mechanics, girls learnt cookery!

I'm thoroughly skint after settling my final tax bill so it's going to have to be a top up for now and a hope it doesn't just piss straight out the bottom.

I read it's a T50 torx which i think I have, I can get the oil easily. Is it the same as doing the gearbox oil, fill till it spills?? Approx how much does the diff hold??

Thanks

Title: Re: Rear Diff - Now with photos
Post by: Welung666 on 13 March 2009, 12:15:21
Rear final drive unit (Diff to you and me) holds 1 litre altogether :y
Title: Re: Rear Diff - Now with photos
Post by: Black Knight on 13 March 2009, 12:22:56
Quote
Rear final drive unit (Diff to you and me) holds 1 litre altogether :y


Ahh thats brilliant, was thinking it would be 6 or 7 litres like the front.

Thats my Saturday morning planned then, Stuck under a car, covered an oil with a stinking hangover ;D
Title: Re: Rear Diff - Now with photos
Post by: MutantCav on 13 March 2009, 13:08:56
Make 100% sure you have something under the diff if you take the cover plate off to empty the oil and replace it all...and wear really old clothing...the stuff REALLY stinks and stays on you and your clothes for 100 washes as the oil generally only gets changed every 60-100k
Title: Re: Rear Diff - Now with photos
Post by: Welung666 on 13 March 2009, 16:21:20
Quote
Make 100% sure you have something under the diff if you take the cover plate off to empty the oil and replace it all...and wear really old clothing...the stuff REALLY stinks and stays on you and your clothes for 100 washes as the oil generally only gets changed every 60-100k

Couldn't agree more Chris! that stuff smells like stale cat pi55 and you can't get rid of the smell no matter what you do!
Title: Re: Rear Diff - Now with photos
Post by: Black Knight on 13 March 2009, 17:33:35
I drained the gearbox fluid form the motorbike at 16K and that was absolutely rancid. I can't wait to sample the delights of 10yr old 130K fluid. If I sniff it will it send me :D??
Title: Re: Rear Diff - Now with photos
Post by: MutantCav on 13 March 2009, 18:17:44
Believe me, get it on anything and you will be able to sniff it forever more on whatever it touches!! Burnt nasty foul smelling stuff...definitely worse than stale cat pee and thats pretty bad stuff!!
Title: Re: Rear Diff - Now with photos
Post by: eddie on 14 March 2009, 01:02:39
Check the diff output bearings too. Just grab the drive shaft next to the diff and push up and down.

eddie
Title: Re: Rear Diff - Now with photos
Post by: Black Knight on 14 March 2009, 10:08:01
Quick question....


When topping up the diff oil should you have the engine running throughout as you would when topping up the gearbox??
Title: Re: Rear Diff - Now with photos
Post by: Chris_H on 14 March 2009, 10:39:26
Quote
When topping up the diff oil should you have the engine running throughout as you would when topping up the gearbox??

I can't see that helping.
Title: Re: Rear Diff - Now with photos
Post by: Black Knight on 14 March 2009, 12:01:05
Right, all done, fairly easy but really need to get myself a proper jack. The one that comes with the car is no good for doing maintaince.


Oh, and the squeaky noise is still there! >:(

I'm sure its something to do with the drive system or brakes as you can hear it as soon as you pull away and it's on/off as the wheels turn but regular.
Title: Re: Rear Diff - Now with photos
Post by: Shagma on 23 March 2009, 23:17:23
Quote
Right, all done, fairly easy but really need to get myself a proper jack. The one that comes with the car is no good for doing maintaince.


Oh, and the squeaky noise is still there! >:(

I'm sure its something to do with the drive system or brakes as you can hear it as soon as you pull away and it's on/off as the wheels turn but regular.

Keep us all updated on your progress please, as this seems to be a common case on most omega's. :)
I have asked garage to check oil level and oil condition tomorrow, so I hope things turns out positively for me..:)
And YES, the default vauxhall/opel jack supplied with the car is embarrasing........