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Rear Diff care

onyx84
Posts: 644
Joined: Thu Jul 16, 2009 8:37 am
Location: Siegen, Germany

Re: Rear Diff care

Postby onyx84 » Thu Jul 10, 2014 11:10 am

No it wasnt changed in the past. I got all the documentary from delivery till today. No diff change.

Its said to be the first of the revised 4litre Sovereign series (model 1990) to be in Germany.
First owner Jaguar Germany. So maybe thats the reason.
'89 4litre Sovereign in Regency red

MagicDoormouse
Posts: 19916
Joined: Sun Apr 08, 2012 10:37 am

Re: Rear Diff care

Postby MagicDoormouse » Thu Jul 10, 2014 11:17 am

Good news then! Got any pictures Axel?
1990 Sovereign (Brian)
1994 Sovereign Silver
1993 Daimler (Parkhouse)
1990 XJR Solent
1993 Daimler Double 6
1993 XJR Flamenco
1991 XJS V12
1976 Capri 3.0 V6

onyx84
Posts: 644
Joined: Thu Jul 16, 2009 8:37 am
Location: Siegen, Germany

Re: Rear Diff care

Postby onyx84 » Thu Jul 10, 2014 11:19 am

From the diff, or from the car?
'89 4litre Sovereign in Regency red

naki_k
Super Moderator
Posts: 28912
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Rear Diff care

Postby naki_k » Thu Jul 10, 2014 12:08 pm

onyx84 wrote:No it wasnt changed in the past. I got all the documentary from delivery till today. No diff change.

Its said to be the first of the revised 4litre Sovereign series (model 1990) to be in Germany.
First owner Jaguar Germany. So maybe thats the reason.


so it will have been a dealer demonstrator, or company car for an employee.
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6 x2
93 6.0 XJ81 XJ12
94 4.0 XJR
94 4.0 Daimler
96 4.0 X306 XJR
96 4.0 X300 D6
97 4.0 X300 Sport Manual
2000 LR Discovery ES TD5 A
Breaking 40/ 300

MagicDoormouse
Posts: 19916
Joined: Sun Apr 08, 2012 10:37 am

Re: Rear Diff care

Postby MagicDoormouse » Thu Jul 10, 2014 12:23 pm

Both of course!
1990 Sovereign (Brian)
1994 Sovereign Silver
1993 Daimler (Parkhouse)
1990 XJR Solent
1993 Daimler Double 6
1993 XJR Flamenco
1991 XJS V12
1976 Capri 3.0 V6

onyx84
Posts: 644
Joined: Thu Jul 16, 2009 8:37 am
Location: Siegen, Germany

Re: Rear Diff care

Postby onyx84 » Thu Jul 10, 2014 1:00 pm

I added some pictures in the members cars section.


Its said to be a demonstrator for about a year.

My mechanic who worked as Jag mechanic back in the the days when the XJ40 was new, says that my car has also more works rust proofing than other XJ40s.
'89 4litre Sovereign in Regency red

raziel
Posts: 64
Joined: Wed Aug 10, 2011 11:45 pm

Re: Rear Diff care

Postby raziel » Thu Jul 10, 2014 6:16 pm

Hi,

I have a question too. I didn't read whole post as it is very long, just the begining and I have just half of my answer so far. Cause you stated that 80W/90 is better over 75W/140. However....

Manual recommend 80W/90 GL5 oil. But I read many posts on internet, that 75W/140 GL5 is better and the only reason why manual does not recommend this one, is, that this oil didn't exist at that time yet. So some people think that 75W/140 is better, so why not use better oil.

According to my manual I should use exactly this one: http://www.ebay.co.uk/itm/Shell-Spirax- ... RTM1793562

and here is example of 70w/140: http://www.ebay.co.uk/itm/Castrol-Syntr ... RTM1793565

so now I have another question......is my differential Limited Slip type or Non Limited Slip type ?? Please can somebody tell mi this ? My car is Daimler xj40 4.0l engine, automatic, 1991. As you can see in description of 75w/140 oil, it is also suitable for Non Limited Slip dyff, so it seems like it is safer to use.

However I also found this: http://britishparts.co.uk/products/5421 ... e-JLM10814

and I HAVE it at home, I bought it long time ago with other parts, just to see what it is :) but I am still not sure what is it for.

Is it perhaps special treatment for Limited Slip dyfferentials ? So if I have oil that is for Non Limited Slip dyff, than I should use this Additive ?
So will be Shell Spirax 80W/90 (which I don't know if it is for LSD or Non LSD dyffs) combined with this Additive good choice for my Jag ? Do you think I can mix it just like that with the oil ?

MagicDoormouse
Posts: 19916
Joined: Sun Apr 08, 2012 10:37 am

Re: Rear Diff care

Postby MagicDoormouse » Thu Jul 10, 2014 7:34 pm

Jack the back of the car up so the wheels are free and move one wheel forward. If the other wheel also moves forward you have a Limited Slip Diff. If it goes in the opposite direction you don't. This will tell you which oil to use. Spirax for the LSD and HD90 if not. Voila!!!
1990 Sovereign (Brian)
1994 Sovereign Silver
1993 Daimler (Parkhouse)
1990 XJR Solent
1993 Daimler Double 6
1993 XJR Flamenco
1991 XJS V12
1976 Capri 3.0 V6

raziel
Posts: 64
Joined: Wed Aug 10, 2011 11:45 pm

Re: Rear Diff care

Postby raziel » Fri Jul 11, 2014 1:15 am

so what is this additive ?

MagicDoormouse
Posts: 19916
Joined: Sun Apr 08, 2012 10:37 am

Re: Rear Diff care

Postby MagicDoormouse » Fri Jul 11, 2014 9:44 am

The additive is extra protection against "blueing" of the crown wheel + pinion and planet gears. As all LSD's are under extra torque and strain the additive was an afterthought - common in a lot of 80's and 90's vehicles. Just use the Spirax if you have a LSD as it is a modern lubricant. If you have some in your stash you can put it in but I doubt it will make much difference?
1990 Sovereign (Brian)
1994 Sovereign Silver
1993 Daimler (Parkhouse)
1990 XJR Solent
1993 Daimler Double 6
1993 XJR Flamenco
1991 XJS V12
1976 Capri 3.0 V6


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