Daimler Double Six / XJ-40 Achilles' Heel
#1
Daimler Double Six / XJ-40 Achilles' Heel
Dear Members,
Greetings. I know this is probably an often asked and often answered question, but any assistance would be appreciated.
Car: Daimler Double Six 1993 Insignia, V12, 5.9L.
Nine years ago I purchased the self-levelling conversion kit and my mechanic replaced the faulty self-levelling system with regular rear shocks. To the best of my knowledge, he followed the instructions and disabled the self-levelling unit.
My question is this: Do I need to keep filling up the green fluid now?
When I picked the car up nine year ago, I was surprised to see the self-levelling reservoir still in the car. When I asked why, my mechanic told me that it serves a tandem pump that operates both the steering and the self- levelling fluids. So he didn't take the reservoir off. He obviously therefore didn't drain the green fluid out.
The self-levelling fluid hose or unit itself has now started leaking and the fluid has drained from the reservoir. Is this a problem for the tandem pump?
Will the tandem pump continue to work for the steering (red ATF fluid reservoir is fine and full) if there is no green self-levelling fluid in the reservoir going to the pump? My mechanic didn't know if the pump would stop working without the green fluid. He also mentioned that it supports the brakes, but I didn’t quite understand the explanation.
If the unit is leaking, do I need to replace the unit? The hoses for the self-levelling fluid are virtually impossible to find now.
Many thanks,
Charles
Greetings. I know this is probably an often asked and often answered question, but any assistance would be appreciated.
Car: Daimler Double Six 1993 Insignia, V12, 5.9L.
Nine years ago I purchased the self-levelling conversion kit and my mechanic replaced the faulty self-levelling system with regular rear shocks. To the best of my knowledge, he followed the instructions and disabled the self-levelling unit.
My question is this: Do I need to keep filling up the green fluid now?
When I picked the car up nine year ago, I was surprised to see the self-levelling reservoir still in the car. When I asked why, my mechanic told me that it serves a tandem pump that operates both the steering and the self- levelling fluids. So he didn't take the reservoir off. He obviously therefore didn't drain the green fluid out.
The self-levelling fluid hose or unit itself has now started leaking and the fluid has drained from the reservoir. Is this a problem for the tandem pump?
Will the tandem pump continue to work for the steering (red ATF fluid reservoir is fine and full) if there is no green self-levelling fluid in the reservoir going to the pump? My mechanic didn't know if the pump would stop working without the green fluid. He also mentioned that it supports the brakes, but I didn’t quite understand the explanation.
If the unit is leaking, do I need to replace the unit? The hoses for the self-levelling fluid are virtually impossible to find now.
Many thanks,
Charles
#2
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Hi Charles,
For some reason I thought I had seen this same post from you a day or two ago and had already replied, but maybe the Covid is affecting my mind! (I'm actually over Covid as of Sunday).
The manual at the link below gives a thorough explanation of the power hydraulic system. On the 1990-1992 cars, the Hydraulic System Mineral Oil reservoir serves the SLS and power steering systems. However, for the 1993 models, a new steering rack and pump were used and the power steering system used its own supply of fluid, which was Dexron IIE ATF (later superseded by Dexron III).
These manuals should help you determine whether HSMO is still required by any active system in your car. If your car has a separate power steering fluid reservoir for red ATF, then a lack of HSMO should have no affect on your power steering pump.
Jaguar XJ40 Power Hydraulic System Manual
Jaguar XJ12 Technical Introduction 1994
Cheers,
Don
For some reason I thought I had seen this same post from you a day or two ago and had already replied, but maybe the Covid is affecting my mind! (I'm actually over Covid as of Sunday).
The manual at the link below gives a thorough explanation of the power hydraulic system. On the 1990-1992 cars, the Hydraulic System Mineral Oil reservoir serves the SLS and power steering systems. However, for the 1993 models, a new steering rack and pump were used and the power steering system used its own supply of fluid, which was Dexron IIE ATF (later superseded by Dexron III).
These manuals should help you determine whether HSMO is still required by any active system in your car. If your car has a separate power steering fluid reservoir for red ATF, then a lack of HSMO should have no affect on your power steering pump.
Jaguar XJ40 Power Hydraulic System Manual
Jaguar XJ12 Technical Introduction 1994
Cheers,
Don
Last edited by Don B; 11-24-2020 at 09:31 PM.
The following 3 users liked this post by Don B:
#3
Dear Don,
Thank you for your post. Extremely helpful and reassuring! I was worried I would have to track down some second hand hoses for the SLS or the actual tandem unit itself. This is a relief.
You are correct, I believe I submitted an earlier version of this post but I couldn't find it anywhere.
Many thanks and best wishes,
Charles
Thank you for your post. Extremely helpful and reassuring! I was worried I would have to track down some second hand hoses for the SLS or the actual tandem unit itself. This is a relief.
You are correct, I believe I submitted an earlier version of this post but I couldn't find it anywhere.
Many thanks and best wishes,
Charles
#4
Thanks for posting this. I have been wondering about the same thing. The cap to my SLS tank has been drilled at some point but still contained the oil.
I also had the issue with leaking around the pump which I hope is just lose connectors.
I made the assumption that although no longer needed, as the SLS pump is on the same drive as the power steering pump it would need to retain fluid to prevent over heating and both pumps then seizing.
I will have to read through the documents.
As the car is off the road at the moment I haven't got round to refilling or checking for continual leaking.
I also had the issue with leaking around the pump which I hope is just lose connectors.
I made the assumption that although no longer needed, as the SLS pump is on the same drive as the power steering pump it would need to retain fluid to prevent over heating and both pumps then seizing.
I will have to read through the documents.
As the car is off the road at the moment I haven't got round to refilling or checking for continual leaking.
#5
Greetings and update,
I have been driving my 1993 Daimler Double Six virtually every day for the past two weeks with no fluid in the self-levelling reservoir (green cap). I can report no problems with power steering or brakes. The SLF fluid has drained away completely and subsequently my car has stopped leaking the green mineral oil.
I can across the following website that explains the brake/self-levelling separation from MY1990 onward.
https://rensswart.nl/daimler/power-h...-system-en.php
The author concludes that the brake boost cylinder and the self levelling system were completely separated from one another from MY1990 onward.
As Don pointed out above, from MY 1993 onward, the power steering and self levelling system were completely separated with two reservoirs utilized.
So, the conclusion I have drawn is that there is one less set of hoses I need to worry about!!
Charles
I have been driving my 1993 Daimler Double Six virtually every day for the past two weeks with no fluid in the self-levelling reservoir (green cap). I can report no problems with power steering or brakes. The SLF fluid has drained away completely and subsequently my car has stopped leaking the green mineral oil.
I can across the following website that explains the brake/self-levelling separation from MY1990 onward.
https://rensswart.nl/daimler/power-h...-system-en.php
The author concludes that the brake boost cylinder and the self levelling system were completely separated from one another from MY1990 onward.
As Don pointed out above, from MY 1993 onward, the power steering and self levelling system were completely separated with two reservoirs utilized.
So, the conclusion I have drawn is that there is one less set of hoses I need to worry about!!
Charles
The following users liked this post:
Don B (12-02-2020)
#6
#7
So, this discussion raises an interesting question. Jaguar built two pumps (NAB3731AA - tandem PS & SLS) and (NAB3731CA - only power steering). If someone with a disabled SLS system needed to replace the tandem pump, could they simply get the reconditioned single pump version (NAB3731CA) and then get rid of all the SLS hoses and reservoir?
Anyone with experience?
Charles
Anyone with experience?
Charles
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#9
I have one on a '96 XJ12 parts car. It would be the CA non-leveling type.
I don't know if it's good though, as the car is dead.
I'd be willing to send it for you to try, although you may only want a known to be working one, considering the work involved, and the distance/cost of shipping.
Good luck,
Rob
I don't know if it's good though, as the car is dead.
I'd be willing to send it for you to try, although you may only want a known to be working one, considering the work involved, and the distance/cost of shipping.
Good luck,
Rob
The following users liked this post:
Lawrence (12-07-2020)
#10
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