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Clunking from rear wheel #707363
20/06/21 01:38 PM
20/06/21 01:38 PM
Joined: Jul 2020
Posts: 53
Cheshire
F
Fus969 Offline OP
Just Getting Started
Fus969  Offline OP
Just Getting Started
F

Joined: Jul 2020
Posts: 53
Cheshire
Hi my 97 +8 has a clunking sound when I roll it forward or backwards sounds like it’s off side rear wheel, had the brakes done recently unrelated to this issue that made no difference so I’m thinking maybe bearings? It happens whether it been stood or just back from a spin and more notable on full lock . Any suggestions would be appreciated

Re: Clunking from rear wheel [Re: Fus969] #707365
20/06/21 01:47 PM
20/06/21 01:47 PM
Joined: Dec 2008
Posts: 19,782
South Yorkshire
DaveW Offline
Roadster Guru
DaveW  Offline
Roadster Guru
Member of the Inner Circle

Joined: Dec 2008
Posts: 19,782
South Yorkshire
If you have wire wheels, make sure the centrelock nuts are tight.

Sometimes the LSD can click, which resonates through the spokes, and is more obvious on lock.

When was the diff oil last changed? You need an oil with friction modifier...... Friction modifier makes the fluid "slicker" so without the additive the limited slip clutches will grab and it will shudder going around tight turns.


DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
Re: Clunking from rear wheel [Re: Fus969] #707369
20/06/21 01:51 PM
20/06/21 01:51 PM
Joined: Jul 2007
Posts: 20,760
Suffolk
John V6 Offline
Brooklands Register contact
John V6  Offline
Brooklands Register contact
Member of the Inner Circle

Joined: Jul 2007
Posts: 20,760
Suffolk
Have the UJs on the drive shaft been greased.


JohnV6
2014 Brooklands Edition Roadster "Brookland's Belle" #5 of 50
Re: Clunking from rear wheel [Re: Fus969] #707403
20/06/21 06:20 PM
20/06/21 06:20 PM
Joined: Jul 2020
Posts: 53
Cheshire
F
Fus969 Offline OP
Just Getting Started
Fus969  Offline OP
Just Getting Started
F

Joined: Jul 2020
Posts: 53
Cheshire
The car was serviced in December at Oakmere and I asked them to check all the fluids and grease points that was 200 miles ago .I may have to get under it and check all was done . Wasn’t to impressed with them the car had no oil leaks before service now I have two ! Very minor but there

Re: Clunking from rear wheel [Re: Fus969] #707404
20/06/21 06:20 PM
20/06/21 06:20 PM
Joined: Nov 2015
Posts: 4,055
Northern Capital of Cool
CooperMan Offline
Just barreling along
CooperMan  Offline
Just barreling along
Part of the Furniture

Joined: Nov 2015
Posts: 4,055
Northern Capital of Cool
My money's on Dave W's comment re the LSD, it needs an oil change


Jon M
Re: Clunking from rear wheel [Re: CooperMan] #707407
20/06/21 06:35 PM
20/06/21 06:35 PM
Joined: Feb 2020
Posts: 342
Cotswolds
Treesurveyor Offline
Learner Plates Off!
Treesurveyor  Offline
Learner Plates Off!

Joined: Feb 2020
Posts: 342
Cotswolds
+2 for the diff oil change, and thanks for the reminder, mines due. I also have light intermittent clunk on takeup.
Syntrans is pretty much all in with FM additive

https://www.eurocarparts.com/search...Yg8q2TMGP2GuiQiK4Bm1XJN36VRoCsR4QAvD_BwE, available from other outlets.

I'm using MTF94 which I buy in 5l, with redline FM, but I'm likely changing diff oil every 18 months or so.

https://www.googleadservices.com/pa...bxAhXRfMAKHfxnAL8Qwg96BAgBEBc&adurl=

It's worth doing the gearbox at the same time, unless it was changed at last service/<25k miles.


"DOT" 35th Anniversary Edition Plus 8- family owned from new. Rolls Royce Pewter.
06 Saab 93
Re: Clunking from rear wheel [Re: Fus969] #707408
20/06/21 06:37 PM
20/06/21 06:37 PM
Joined: Dec 2009
Posts: 28,682
Devonshire
+8Rich Offline
Tricky Dicky
+8Rich  Offline
Tricky Dicky
Member of the Inner Circle

Joined: Dec 2009
Posts: 28,682
Devonshire
Worth checking the U bolts on axle too.


Regards Richard

1999 Indigo Blue +8
2009 4/4 Sport Green prev
1994 Connaught Green +8 prev





Re: Clunking from rear wheel [Re: Fus969] #707410
20/06/21 06:41 PM
20/06/21 06:41 PM
Joined: Feb 2020
Posts: 342
Cotswolds
Treesurveyor Offline
Learner Plates Off!
Treesurveyor  Offline
Learner Plates Off!

Joined: Feb 2020
Posts: 342
Cotswolds
quote=+8Rich]Worth checking the U bolts on axle too.[/quote]
Good point Richard, added to my checklist thumbs

Last edited by Treesurveyor; 20/06/21 06:43 PM.

"DOT" 35th Anniversary Edition Plus 8- family owned from new. Rolls Royce Pewter.
06 Saab 93
Re: Clunking from rear wheel [Re: Treesurveyor] #707411
20/06/21 06:47 PM
20/06/21 06:47 PM
Joined: Feb 2020
Posts: 342
Cotswolds
Treesurveyor Offline
Learner Plates Off!
Treesurveyor  Offline
Learner Plates Off!

Joined: Feb 2020
Posts: 342
Cotswolds
Originally Posted by Treesurveyor
+2 for the diff oil change, and thanks for the reminder, mines due. I also have light intermittent clunk on takeup.
Syntrans is pretty much all in with FM additive

https://www.eurocarparts.com/search...Yg8q2TMGP2GuiQiK4Bm1XJN36VRoCsR4QAvD_BwE, available from other outlets.

I'm using MTF94 which I buy in 5l, with redline FM, but I'm likely changing diff oil every 18 months or so.

https://www.googleadservices.com/pa...bxAhXRfMAKHfxnAL8Qwg96BAgBEBc&adurl=

It's worth doing the gearbox at the same time, unless it was changed at last service/<25k miles.



These fluids are for the BTR axles, Salisbury are different.- see below from GOMOG site

The recommended oil for a LSD Salisbury (Plus 8s & 7HA and 12HA) is a 80/90 Hypoy oil for limited slip differential (LSD) axles (for example;
1. Castrol Hypoy LS90
2. Mobilube Mineral LSD 80/90
3. Royal Purple 80/90 LSD
4. Valvoline
5. Mobil 75/90

Capacity

4/4s Imperial Pints 1.3-1.4 liters Castrol SMX
Plus 4s 2.5 Imperial Pints 1.3-1.4 liters Castrol SMX
Plus 8s 2.5 Imperial Pints 1.3-1.4 liters Castrol Hypoy LS

The recommended oil for a non-LSD Salisbury (4/4s and Plus 4s) is now Castrol 75/90 or its equivalent. Salisbury axle fluid should be ideally changed at 3000 miles intervals. One cannot exaggerate the need to be careful. Never mix old and new oils. Some of the newer dealers suggest what they believe to be modern synthetic equivalents. However, the Salisbury's are not noted for strength and parts are no longer made. A chipped Crown Wheel and/or Pinion will and has sidelined many Salisbury Morgans indefinitely, though they can be had with GREAT DIFFICULTY. As Salisbury's original recommendation has worked for 60 years, there is no logic in taking risks. A BTR can be fit, but MMC waiting times run into many months for a BTR and it is no longer known whether Classic Morgans will be supplied since these models have been abandonned. The cost of the axle and labor to remove the hubs, swap and weld the brackets and install a new BTR will cost £4000...unless the work is done by the owner and he is VERY lucky in their part sourcing.

Last edited by Treesurveyor; 20/06/21 06:51 PM. Reason: update

"DOT" 35th Anniversary Edition Plus 8- family owned from new. Rolls Royce Pewter.
06 Saab 93
Re: Clunking from rear wheel [Re: Fus969] #707418
20/06/21 07:17 PM
20/06/21 07:17 PM
Joined: Aug 2015
Posts: 1,071
A
Arwyn Williams Offline
Has a lot to Say!
Arwyn Williams  Offline
Has a lot to Say!
A

Joined: Aug 2015
Posts: 1,071
Salisbury's are not noted for their strength? Oh really?

Never had a problem with Salisbury axle at all!!

Did a rebuild on a 7HA in a sprint/hillclimb car over Christmas, one that had done 175,000 miles, replacement engine but still the same axle! Speed Mog championship winning car too!

Arwyn

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