Rear diff (1996 Defender 90 300Tdi)-advice please. Sorted

[Cassillis]

Noticed over the last few months there has been a whine from the rear diff, whine stops when coasting or not putting any load on the diff. Even more recently i have been experiencing a rotational knocking noise that is more pronounced on left hand turn, exiting the motorway made a hell of a racket.
It sounds like something is catching a wheel as it rotates it increases and decreases with speed of the vehicle. Nothing has been found from a thorough exterior inspection. Which leaves me to believe i may have a problem within the diff

What i don't want is to be without the car. It would be my intention to have a unit to hand to fit it if needed. So, how do i ascertain which diff i have?

I think someone on here mentioned an engineering place near Luton that do replacement units, anyone got any details?

[biggerlandy]

first look and see what way u can unbolt it do the bolts holding diff in place face forward of landy or is ther a plate on back that you unbolt. next take  a half shaft out and count splines. if ten splines on bit that goes into diff i have a diff

[Cassillis]

first look and see what way u can unbolt it do the bolts holding diff in place face forward of landy or is ther a plate on back that you unbolt. next take  a half shaft out and count splines. if ten splines on bit that goes into diff i have a diff

This is where i begin to regret taking the mickey out of you earlier isn't it :roll:
I know the bolts face the front of the truck will need to check the splines after crimbo
Cheers  :D

[Xtremeteam]

96 tdi? disc rear brakes?

24 spline diff

[extreme90]

before taking it pieces, try dropping the oil out
that will give you a good inside as of the condition inside
if you aint sure what the colour inside means were all here to help  
might be running in water instead of oil  :roll:   :oops:
danny

[Cassillis]

96 tdi? disc rear brakes?

24 spline diff

Thanks for that, fits my vehicle to a tee =D>

[Cassillis]

before taking it pieces, try dropping the oil out
that will give you a good inside as of the condition inside
if you aint sure what the colour inside means were all here to help  
might be running in water instead of oil  :roll:   :oops:
danny

I did that when the whine started. The oil looked good no water and no metalic debris. So it is running in new oil and still it moans.

Typical  :?

[Range Rover Blues]

Couls also be a bearing, wheel or diff.  I'm surprised if it click that only happens when turning one way.  We's often say that's a CV joint in fact.  That doesn't help you much unless you are confucing teh noise from the front/rear which is easy to do as it transmits through the props to the gerabox.

[Cassillis]

Couls also be a bearing, wheel or diff.  I'm surprised if it click that only happens when turning one way.  We's often say that's a CV joint in fact.  That doesn't help you much unless you are confucing teh noise from the front/rear which is easy to do as it transmits through the props to the gerabox.

Agreed, and the noise is intermittent which is even more annoying

I think it is going to be a meticulous strip down from the outside in and have a good look at every thing that rotates rubs or is in close proximity to something else, so the whole truck basically :roll:

[Range Rover Blues]

I had the knocking the other nights whilst out laning.  It came on during the day and I imagined alrsorts.

Turns out I had 4 loose wheel nuts, looks like some t**t has tried nicking one of my wheels.

[davidlandy]

RRB ,

loose wheel?  was it on the nearside by any chance?

[Litch]

To check how many spines pull a halfshaft, to check if it is the diff itself pull both & the prop and then lock the diff to give traction.
As well as a replacement diff you will require diff & flange gaskets and gear-oil, nice easy job when you have confirmed the faulty part and have all the bits.

By the way, I think you mean Ian Ashcroft's.

[Cassillis]

By the way, I think you mean Ian Ashcroft's.

Yep thats the one. Cheers Litch

[Range Rover Blues]

RRB ,

loose wheel?  was it on the nearside by any chance?

Yes, nearside rear, how did you guess?

[Cassillis]

RRB ,

loose wheel?  was it on the nearside by any chance?

Yes, nearside rear, how did you guess?

I'm intrigued now because it sounds like RNS on mine too :?  :?

[davidlandy]

Its nearly always the nearside !

It happens due to the direction of rotation of the wheel vs the anticlockwise direction required to undo the nut.  so if the nuts arent tight enough the direction of rotation means they wind off - not the same for the offside unless you had an opposite thread.

learn something new every day!

[Disco-Ron]

IN order to elliminate the front axle as the source of the noise, why not dissconnect the rear prop, and drive a short way in Diff lock..... if the noise is still there, i'd say it's the front, if not, put rear prop back on, and remove the front one, drive again.. etc etc etc...

[Cassillis]

An update to close this thread and give advice to others, who like me, are finding their way with landies

The problem turned out to be a worn hub on the offside. The hub had worn sufficiently to allow movement. This in turn ruined the bearings as expected. This resulted in sufficient movent in the calliper to allow the pad to move within it and strike the disc as it rotated. :roll:  

I did take the diff out to examine it, it looked like new, Phew!!

[extreme90]

didnt you get a spongey pedal ?
tell tail signs off a brearing shot
dan

[Cassillis]

didnt you get a spongey pedal ?
tell tail signs off a brearing shot
dan

No i didn't funny enough. The bearing wasn't that noisey either. Even more strangely one of the pistons on the other side was lazy and causing uneven wear on the pads. Outer less than 2mm of pad left inner 8mm.................... strange :!:

Running like a swiss watch at the moment Give it 24 hours