I had the car on the lift yesterday and while looking around I noticed looking into the lower grill how the oil cooler is mounted. Instead of being mounted vertical it is mounted horizontal. It runs the full length of the lower grill and it has a plastic deflector mounted on top to direct the airflow down. If you look under the nose you will see louvers where the air is expelled from the cooler. On most applications I have seen the cooler is usually vertical where the air flow is straight through the front.

 

Hang on - the oil cooler sits in the V of the engine block, and is fed with cooled water from the main radiator (it's probably better described as a heat exchanger). What you've described is the auxiliary radiator, only fitted to the XKR:

 

Diagrams from shop Manual:

 

OK I stand corrected and Thanks.

 

No prob - thanks for making me investigate it, since I wasn't aware of it either!

 

No correction intended. I'm glad you bought this subject up. Who would think the 5L SC had an internal engine oil cooler. My GT-R and Merc AMG both have external conventional direct air coolers which IMO would be more effective and safe.


In another diagram in the shop manual it shows a separate line coming from the water pump going to the oil cooler after the water was cooled from the radiator. Our water pumps are also known to have been revised several times because of a design defect. This may add significantly to an engine overheating rapidly when a warning message appears "over heating". I would take any warning message about overheating very seriously with this design.

 

I recall when doing a V8 conversion on my 76 XJS I removed a large oil cooler from in front of the engine. I didn't use one on the V8 so I must have kept this cooler for maybe 10 years before I junked it. I couldn't sell it at the time. This is a 1st for me as I have never seen an internal oil cooler . Live and learn.

 

Picture of water pump with separate outlet to oil cooler. If this fails everything will heat up super quick. DO NOT IGNORE "OVER HEATING" WARNING! Jaguar should, also, release a bulletin to owners to not ignore "over heating" warning if they are not going to recall the defective pump.


It's no secret the original water pump is defective and will fail. Some members have lost their engines from over heating. The water pump is obviously a critical component to safe guard the 5L engine because it feeds the engine and oil cooler. IMO Jaguar should recall cars manufactured with the defective water pump and have the new designed water pump installed. I will surely install the new water pump on my XKR if I still have it when it goes out of warranty. It's not really a big job and can save your engine.

 

Is this oil cooler just on the 5.0L or also on the 4.2L?
I lost my 911 due to a problem with a similar type oil cooler. I found out that Porsche engines don't run well when the oil and coolant mix

 

No, the 4.2 has 1 or 2 conventional radiator-style coolers at the front. Not quite sure which models/years have which - the manual is confusing, as it suggests an XKR has either 1 or 2 and the XK has none. My guess would be: XK has 1, XKR has 2.

 

These are the options from the parts manual. On the 4.2L XK the oil filter seems to screw straight on to the cooler.

 

Wonder when they changed the XKR from one to two - and why. Or perhaps it's a market thing; maybe cars sold in hot places have two.

 

Is there an online location to view the PDF shop manual and parts manual that are referenced in this post? Thanks for any assistance!

Bob

 

I bought mine off eBay, but apparently most of those are bootlegs of one of the forum member's work:

Jaguar XK XKR X150 Workshop Manual

 

An oil to water cooler located under the supercharger. Well, that has to be one of the more complicated solutions to a simple problem that I have run across.

Learn something every day.

 

The airflow transition for the auxillary radiator is an interesting turn of logic. It would keep the exhausted air from continuuing on through the main radiator.

As for hiding the oil heat exchanger under the SC, they obviously wanted something else to inconvenience diy'ers besides the infamous hoses under the SC.

 

Is there any way to run a conventional air to air oil cooler? Driving round the nurburgring and i was hitting 130°c oil temps, and would like to find a way of stopping that!!

 

Not sure where you'd hide it - there's not a lot of unoccupied space with access to frontal airflow.

 

Would a heatsink on the oilpan make sense? (where it would protrude from a cutout in the liner)
Or would there be not enough ground clearance?

 

this is nothing new, to aid quick warm up times the oil is firstly heated by the coolant, once up to temp the oil is cooled by the coolant, so it’s not just an oil cooler! Works well until failure fills the cooling system with oil! Like mine which is broken down miles from home on a weekend away! Recovery home tomorrow.