1988 xjs oil cooler removel
 

hey guys
i notice an oil leaking from the oil cooler core so i need to pull it out

what would be the best way to do it ?
should i remove the rediator ?
i attatched a photo showing the place of the leak
https://cimg9.ibsrv.net/gimg/www.jag...3e4277ffcb.jpg

Hi Shahar

Its really not that easy as removing the Oil Cooler is a real 'Nightmare Job' and once you start there is no going back so decide if you're going to do this yourself or take it into a shop

Either way it's going to be expensive!

BTW you didn't include the Photo

https://cimg1.ibsrv.net/gimg/www.jag...8120a92d39.jpg
https://cimg2.ibsrv.net/gimg/www.jag...5726427687.jpg
Removing the oil cooler is not easy. I suggest you remove the radiator, the lower grille, the diagonal brace across the front of the rad stack and the bonnet. The you can get at the two large fixings that join the oil cooler pipes to the cooler. These will almost certainly be so corroded onto the cooler threads that undoing them will ruin the cooler, so be prepared to buy a new one. They are quite expensive. It think, repeat think, you can just get access to the cooler without removing the lower panels beneath the bumper and the bumper itself.
The cooler sits under the aircon condenser, which has to be carefully raised about an inch to get the cooler out once it is disconnected. The attached pics show you the setup pretty clearly. If you have a hydraulic shop available to put new fittings on the OEM hoses, then buying an aftermarket cooler will be much cheaper and it would not matter if it was a bit smaller; but you would have to build some sort of supporting cage to mount it on the original mountings and support the aircon radiator.

Hi Shahar

As 'Greg' said and as I found out for myself, with Two dissimilar Metals being the Alloy Oil Cooler and the Mild Steel Nuts on those Pipes, those connections would almost certainly have Welded themselves together

Where trying to undo them could damage other Components and so you will almost certainly have to cut through the Metal Fittings in order to get the Old Oil Cooler off (which I have had to do Twice!)

This is not a Job for the 'Feint Hearted' and as I have already said before, once you have made a start there is No Going Back!

So ask yourself the Question, do I have the Mechanical Skills as well as the Grit and Determination, that will be required in order to see this Job through

Plus a Shedload of Cash for the Pipes and a New Oil Cooler, though you could save money on the Pipes/Tubes by having your local Hydraulic Shop make the Pipes up for you

Quite possibly one of the Hardest jobs for a DIY Mechanic to do on an XJS

A Total PIA from Start to Finish!

"greg", unbolt the two bolt that connecting the pipes to the coller was pretty easy task for me now im asking what should be the next step ? is there any other screws or bolts that i should remove ?

If the cooler is free of the oil pipes, then it is a matter of getting it free. To do this, raise the aircon condenser enough to free the top of the cooler, and then the cooler itself might be able to be pulled up and out. It might be just on pegs into the bracket that it stands on, OR, it might be bolted to it by nut onto a threaded stud going up through the bracket into the cooler. My second photo above shows the cooler secured by a nut onto stud coming down from the cooler through the chassis bracket. Whether this was my idea or was standard, I cannot remember.

do you remember where did you buy your oil cooler ?
i think i should replace it

they are available from David Manners; but you must tell them if you have a "full flow" or "bypass" (also called "relief" flow) oil cooling system, as the cooler oil pipe threads are different. If your car is full flow then the oil cooler pipes come from and go back to the oil filter fitting.
If it is bypass, there is only one pipe from the filter and the other returns to the front RHS of the sump sandwich plate at the front bottom of the engine.
Full flow:
Jaguar Partno_CBC2692_OIL COOLER FULL FLOW XJ12 SER 3/XJS V12_David Manners Group with Alts
bypass:
Jaguar Partno_C43923_OIL COOLER ''RELIEF'' XJ12 SER 3/XJS V12_David Manners Group with Alts

hey
how do i know if i have "bypass" or "full flow" cooler ??

I explained how in my previous post....
If your car is full flow then the oil cooler pipes come from and go back to the oil filter fitting.
If it is bypass, there is only one pipe from the filter and the other returns to the front RHS of the sump sandwich plate at the front bottom of the engine

https://cimg3.ibsrv.net/gimg/www.jag...61e68dc8a8.jpg
Found this hope its helps.