1984 XJ6 Soveriegn- going after an oil leak!

Here are pictures taken where the oil apparently originates from under the front right side of the engine compartment.
Anybody “been there, done that?”
I am hoping for an relatively easily-fixed source.
Thanks in advance!

Getting it clean might help but I would suggest that its from the steering rack possibly, some have oil in the boots, yours is obviously split and needs replacing.

Typically there are several leaks. There’s just too much oil everywhere to tell where the leaks area The area needs to be cleaned then rechecked. In any case you need to keep the oil off any rubber parts like suspension bushings and any hoses. The oil deteriorates the rubber. Looks like your steering rack bushings are shot


Making sure the engine breather system is clean can often reduce leaks to a tolerable level. If the system is clogged the crankcase pressure pushes the oil out.

Clean the mess, clean the breather system, driver for a few days, recheck


Thanks for the replies. Actually, I was going to rebuild the steering rack last year. But now I have more direction. The front end is up on ramps. I will clean up the oil, take a closer look, and then schedule the steering rack work.

Some common sources of engine oil leaks in that area include the breather assembly (as mentioned already by Doug), camshaft cover seals, and the oil cooler hoses. I removed and replaced the oil cooler hoses on both of my Series III XJ6s because they were just oozing oil through the original hoses and making quite a mess. I agree with Doug that you first need to clean everything up to see what you have. I recommend that in addition to the steering rack work, that you clean up the breather, replace the camshaft cover seals, replace the oil cooler hoses (and check the oil cooler for leaks as well), and then drive the car to see if that fixes the leaks or if other ones are now visible.


Your picture shows the rear of the engine compartment, Bud - with the steering rack…?

xj6 85 Sov Europe (UK/NZ)

Probably. Level with the right front tire.

The oil filter is wet - start there. Clean everything with brake cleaner, take if for a drive, check again.

An easy start- thanks.

Oil filter could indeed be the culprit here. In the words of Nick Lowe, “take it from a fool who knows.”

Replaced the oil filter, cleaned things up a bit, then drove it for a few miles. As you can see, the oil filter seal is OK

, but oil is dripping on the top of the filter and streaking down. Oil1 is taken from below, Oil2 is from above.

Now removing the intake assembly for a better view from above.

Cam cover gasket, but that oil needs to be changed by the looks of it.

Attached is a picture of the right side of the engine in my former 1984 XJ6 Vanden Plas when I removed and replaced the engine a few years ago.

I suspect that your oil leak may very well be coming from the two oil cooler hoses directly above the oil filter (circled in red). Those oil cooler hoses (CBC1437, CBC1438) can leak, and the o-rings at the end of the hoses (CAC5118) can leak as well. Other potential sources of oil leaks in that area are the oil pressure transmitter and the oil supply line to the camshafts also shown in this picture.


Spot on, Paul. And thanks for the response.
I just removed the air intake assembly and took a “money shot” picture of the area above the oil filter.
Here it is:

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The oil doesn’t look bad to me and happy you found the source.

Those oil cooler hoses on my Series III XJ6s just oozed oil right through the hoses and made a mess from the oil cooler all the way back to the engine. Seems to me that I purchased a set of new hoses for one car (they were a bit pricey) and had the existing hoses rebuilt at a local hydraulics shop with the metal ends and modern hose meant for engine oil for the other car (but that was also pricey).


I see a new oil cooler line that should work for one (CBC1437) on Ebay.

Is CBC1438 the same, or slightly different?

Answered my own question. Different- one inlet, one outlet.

The two oil cooler hoses, CBC1437 and CBC1438 are different, that is why they have different part numbers. If you are going to work on your car you would benefit greatly by having a hard copy of the Jaguar Series III XJ6 Parts Catalogue. It will help answer this question and hundreds more that you haven’t thought of yet. The Parts Catalogues show up regularly on eBay for $30-$40 US. Just search eBay for “Jaguar XJ6 Parts Catalogue” and you will find them.


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Thanks Paul.
General question while I wait for the lines to arrive- did you need to remove the bonnet to access the cooler lines in front of the radiator?

Well, yes, I did remove the bonnet and a few other things when I replaced those oil cooler hoses :wink:

This is my former 1987 XJ6 Vanden Plas when I removed and replaced the engine after the rings failed in the #6 cylinder and made quite a mess. :sob: The engine was beyond economical repair for me, but luckily I found a nicely running 1985 XJ6 parts car with and did the engine swap in my shop. The car ran nicely with the donor engine for several years before I sold it.

This is my former 1984 XJ6 Vanden Plas after the 200K mile engine with very low oil pressure blew a second head gasket. Luckily I found a low mileage crash damaged 1987 XJ6 with a nicely running engine and did another engine swap. I sold this concours level car in 2020 to a car collector.

Needless to say that my removals and replacements of the oil cooler hoses were just minor parts of these projects, and they were pretty easy compared to the rest of the work that I did because I had full access to everything. The oil cooler hoses in both cases were oozing oil. When I did the engine changes (and posted pictures and details on Jag-Lovers) I cleaned, polished, painted, or replated pretty much everything in the engine bay. I replaced all of the belts and hoses in the process.

I have removed and replaced the bonnets from my Series III Saloons many times with a helper without any issues. I would probably remove the bonnet if I were going to replace just the oil cooler hoses primarily for good access to where the oil cooler hoses attach to the oil cooler. You can be certain that the rubber mounts for your oil cooler are shot, so order them ahead of time.