XJ XJ6 / XJ8 / XJR ( X350 & X358 ) 2003 - 2009

Rear Main Seal

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Old Jul 14, 2022 | 12:11 PM
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pkoko's Avatar
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Default Rear Main Seal

Hello. My transmission has been slowly leaking some fluid and today I confirmed from the transmission shop that it is the main rear seal that needs replacement. It is the seal from the flywheel and transmission based on my understanding. It is a transmission out job and fairly labor intensive. I didn't get an estimate as my shop couldn't find the parts. To add insult to injury my local Jag dealer is also unable to get the parts as they are no longer made.. Any advice on getting the parts?

I am also wondering if this is an urgent repair or something that I can live with. If I am going to do this work; are there any "easy" to reach parts that should also be replaced? The transmission mount was replaced 60 days ago. Should I also replace the engine mounts?

Any advice is appreciated
 

Last edited by pkoko; Jul 14, 2022 at 12:37 PM.
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Old Jul 15, 2022 | 09:14 AM
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any help or update? I would appreciate anything.

Small Update: Apparently I am leaking engine oil according to my mechanic. I will take a picture and share it with everyone. But it looks too clear to be engine oil. But then again the oil has been changed 2k miles ago. I will compare it with the dipstick.
 

Last edited by pkoko; Jul 15, 2022 at 11:38 AM.
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Old Jul 15, 2022 | 07:13 PM
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With regarding parts try Ebay. I had relatively good success buying from a seller with lots of reviews.
 
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Old Jul 15, 2022 | 09:39 PM
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The rear main crank seal is a "transmission out" job as you indicated. I'm curious, though, what parts was the shop and Jaguar dealer not able to locate? In addition to the rear seal, there's an oil gallery plug that should be checked and resealed with lock-tite or similar, but my understanding is the old plug can be cleaned and reused.

For a job like this, I had trouble finding an auto repair shop that was interested in it. I did, however, have more luck with transmission repair specialist shops. Most of the work on the crank seal or gallery plug involves removing the transmission, so transmission shops should generally be familiar with the work involved. Find a shop with experience on ZF 6 speed transmissions. My transmission shop didn't not have any issues with parts availability (and in addition to doing the rear seal and plug, they rebuild my torque converter and transmission).

Good luck with it. The rear main seal leak is an annoying one, I found oil drips every time I moved the car.
 
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Old Jul 16, 2022 | 04:02 AM
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I bought the Transmission seal and O-Ring from British Parts?

Jaguar X350 X358 XJ XJR Parts XJ X350 New Parts |British Parts UK
 
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Old Jul 18, 2022 | 10:41 PM
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Thanks to everyone especially those who sent me info regarding the parts.

The car currently drips very small amount of oil. This isn't something that you would notice if I parked the cars for one evening or during work. Is it worth doing considering the cost and difficulty of the work? What are the consequences of waiting on it?

On another note; my passenger side valve cover is leaking (again little amount of oil) and I plan on prioritizing that job. Is that a good decision? Finally, do I need to do both banks at the same time?
 
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Old Jul 23, 2022 | 06:10 AM
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Would anyone consider using any engine oil sealer in order to avoid doing the rear main seal? I am thinking about trying the bluedevil compound and driving the car for less than 100 mi then replace the oil.

Since I will replace the valve cover gaskets and change the oil anyway; I hope this will slow down the or permanently stop the rear main seal leak.

Or is any engine oil stop leak too dangerous to pour in a perfectly working engine?

Finally, I open to any recommendations regarding an engine oil stop leak.
 
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Old Jul 23, 2022 | 12:30 PM
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Hello. In opinion, don't waste your time with any kind of stop-leak.
If the leak is slow, you will not be able to detect its origin by checking your oil with the dipstick.
I would change both valve cover gaskets first, then monitor the drips (including suspected main) to see if they go away.
If the rear main leak is very slow, I would live with it for a while.
 
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Old Jul 23, 2022 | 08:01 PM
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Originally Posted by Tigre
Hello. In opinion, don't waste your time with any kind of stop-leak.
If the leak is slow, you will not be able to detect its origin by checking your oil with the dipstick.
I would change both valve cover gaskets first, then monitor the drips (including suspected main) to see if they go away.
If the rear main leak is very slow, I would live with it for a while
.
I think this is sound advice and quite honestly my plan. The only departure is that I am going to use Liqui moly engine oil saver which is designed to
Maintains and regenerates rubber and plastic seals in the engine oil circuit of gas and diesel engines. Oil consumption due to aged and hardened valve stem seals is reduced. No more blue exhaust smoke, improved emissions. External leaks are minimized or even eliminated. Dampens engine noise and reduces repair costs. Reduces pollution and improves the environment.
Based on everything that I read; it is not an oil stop leak but rather an engine seals rejuvenator. It can't hurt and I read that it is very safe. I will keep everyone updated
 
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Old Dec 4, 2023 | 01:00 AM
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Originally Posted by pkoko
I think this is sound advice and quite honestly my plan. The only departure is that I am going to use Liqui moly engine oil saver which is designed to


Based on everything that I read; it is not an oil stop leak but rather an engine seals rejuvenator. It can't hurt and I read that it is very safe. I will keep everyone updated
doing the same myself if you would you mind keeping us (or at least me) updated?
 
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