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Audi allroad oil leak 2.7T

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Old 01-11-2011, 04:44 AM   #1
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Default Audi allroad oil leak 2.7T

Hi guys. I know this tread is posted already 100 times but I couldn't find the answer I'm looking for.

As I went through loads of discussions and websites I probably found the couse of oil leak in here:

http://www.blauparts.com/audi/audi_o...il_leaks.shtml

According to that I've got 'rear crankshaft seal leak' wicth will cause a collection of oil to accumulate and drip from the bottom of the bell housing area.

So now my question is where is that 'rear crankshaft seal' and how to change it. Believe me I've read loads of threads and wathed youtube videos but couldn't figer it out. I think it has some other name or so.

Help Please!!!
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Old 01-11-2011, 05:29 AM   #2
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Originally Posted by rylis View Post
Hi guys. I know this tread is posted already 100 times but I couldn't find the answer I'm looking for.

As I went through loads of discussions and websites I probably found the couse of oil leak in here:

http://www.blauparts.com/audi/audi_o...il_leaks.shtml

According to that I've got 'rear crankshaft seal leak' wicth will cause a collection of oil to accumulate and drip from the bottom of the bell housing area.

So now my question is where is that 'rear crankshaft seal' and how to change it. Believe me I've read loads of threads and wathed youtube videos but couldn't figer it out. I think it has some other name or so.

Help Please!!!
Unfortunately, if that's what it is, it is in single worst spot you can imagine, inside the bell housing, behind flywheel.

Ensure that this is where it leaks before you disassemble the whole thing. It is far more probably that turbo oil line or turbo line distributor are leaking oil and it might look like it is coming from bell housing since the would be dripping on top of it. Is the oil coming from inside one of the bell housing opening and there is no sight of oiil flowing around bell housing or is it just flowing on the outside surface of bell housing? First one would probably be RMS/oil pan seal, second would be something above it.

The only way to access RMS is unfortunately after removing whole transmission and then unbolting the flywheel/flexplate (depending which tranny you have). It is an expensive fix if you don't do it yourself.

Last edited by thejulex; 01-11-2011 at 05:34 AM.
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Old 01-11-2011, 05:46 AM   #3
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Can u explain how does it work: 'collection of oil to accumulate and drip from the bottom of the bell housing area' as this happens inside (as i can imagine) or maybe u have some other guesses???
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Old 01-11-2011, 06:53 AM   #4
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Can u explain how does it work: 'collection of oil to accumulate and drip from the bottom of the bell housing area' as this happens inside (as i can imagine) or maybe u have some other guesses???
Bell housing has several slots open for clutch ventilation and cooling, they are all around the bell housing where it meets the engine block. Leaking RMS would cause oil to drip down behind flywheel and collect in one area of bell housing. I said one area since bellhousing has reinforcement ridges on the inside wall which create rectangular cells which needs to fill out before the oil spill over to next cell/opening. Eventually you have so much oil there that it reaches one of the slots and flows out. There is a remote possibility that something leaking above drips right into one of the slots on top and after collecting inside of bell housing, flows out making it look like it is coming directly from inside but it is really not.

You have to really do some grease work here and look behind the engine from top and bottom to ensure you don't see any oil entering the bell housing or flowing around it before you deem RMS as the culprit.
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Old 01-11-2011, 08:14 AM   #5
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Bell housing has several slots open for clutch ventilation and cooling, they are all around the bell housing where it meets the engine block. Leaking RMS would cause oil to drip down behind flywheel and collect in one area of bell housing. I said one area since bellhousing has reinforcement ridges on the inside wall which create rectangular cells which needs to fill out before the oil spill over to next cell/opening. Eventually you have so much oil there that it reaches one of the slots and flows out. There is a remote possibility that something leaking above drips right into one of the slots on top and after collecting inside of bell housing, flows out making it look like it is coming directly from inside but it is really not.

You have to really do some grease work here and look behind the engine from top and bottom to ensure you don't see any oil entering the bell housing or flowing around it before you deem RMS as the culprit.
Can u tell me exactly where the rear seal sits according to the pic???
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Old 01-11-2011, 08:52 AM   #6
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Can u tell me exactly where the rear seal sits according to the pic???
It is not on there but it sits right at the end of crankshaft, #1 where #8 flwyheel bolts on to the crank.

Check this post, RMS is the part crank is sticking out in the picture couple of pages down.


http://forums.audiworld.com/showthread.php?t=1636345
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Old 01-11-2011, 12:37 PM   #7
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So just to make clear.. Is it No 17 that I'm after???
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Old 01-11-2011, 12:39 PM   #8
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?
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Old 01-12-2011, 06:41 AM   #9
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Ok. So till I get answer to my question about seal I'll tell full story (thats probably where should this thread had to be started from)...

After half a year since I bougth my Allroad, I've noticed minor oil leak after removing plastic bottom engine cover. It was so small so I didn't need any oil topups between complete oil change...
So after anoter year or so I thought its about a time to get rid of this issue so I went to mechanic (what a fool!!!)

To make the story shorter they repleced Valve Head gasket twice (as they thougth that's where the leak was coming from). Second time they put loads of silicone whitch is sticking out about quarter of inch (probably inside aswell !!!) and I end up with much harder oil leak (oil smell and even visible oil smoke) ....

I forgot to mention that after the 'fix' we run car for about an hour and didn't spot any leaking (ir ran idle, then about 3000-4000 rpm, and nothing)... until I took it on a road!!! After couple minutes of hard driving (I suspected the turbos) I returned to a garage and oil smoke was coming when we lifted the bonnet. U can only imagine how does bottom af engine was looked like...

And this is how I started my research and stopped on Rear Crankshaft Seal. I'm not a good writer but you should get the point. So any ideas or suggestion on what/how to check anything esle before I start removing tranny...

Many thanks for your inputs...
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Old 01-12-2011, 11:21 AM   #10
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From what I read you need a new mechanic and likely new valve cover gaskets.
There are many places the 2.7 leaks oil from including but not limited to....
valve covers, cam seals, rear cam plugs and front prop seal. Any one of which a shop charges a small fortune to replace. All of the above were replaced on my 2002 2.7 before 100K. I have since purchased and installed the updated oil filler (breather cap). It is said it reduces the pressure on the gaskets.

http://forums.audiworld.com/showthre...e+cover+gasket

Last edited by finiki; 01-13-2011 at 02:58 PM.
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Old 01-13-2011, 12:14 PM   #11
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Any more for any more??? Come on guys, bring your thoughts on!!! Share your experience... Help please...
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Old 01-13-2011, 04:37 PM   #12
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Since it didn't leak bad until you took it out and drove it hard I'm thinking maybe your building up pressure inside the engine and blowing oil out past the seals/gaskets. Thinking pressure from the turbo boost is leaking into the engine through a breather. Look for a problem in the PVC system and/or get the breathable oil filler cap.
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Old 01-14-2011, 04:41 AM   #13
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So as can imagine, the PVC system (breather) is what is shown below in the picture (correct me if I'm wrong). The only thing that's may be foulty here is an air pupm (again, correct me if I'm wrong) as I can't imagine how air pipes can become blocked.... or maybe there is something more I should know???
Now the other thing: lets assume its pressure foult... what is the way to find the weakest link (leaking seal)??? or what are the best sequent steps for exact leak detection!!!
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Old 01-14-2011, 11:15 AM   #14
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The air pipes can become clogged if you or the previous owner ran cheap, heaven forbid conventional oil, in it. Turbo engines are very hard on oil and a oil that is not up to the task will create sludge. This sludge can build up inside the PCV system and clog it up. Only synthetic VW 502 approved or better oil should be used in the 2.7t.

Knock on wood, but my Allroad has no leaks. It came with all service records and was always run on very good synthetic oil, dealer changed. I checked my PCV system when I bought it and it was very clean.

My 2.8 A4, on the other hand, had been run on quicky lube conventional oil for about 40k miles prior to my ownership. The system in that car is not clogged, but there is a fair bit of buildup. Both engines have similar # of miles.
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Old 01-16-2011, 09:24 PM   #15
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So according to the pic above what breather parts would you recommend to replace???
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Old 01-18-2011, 09:43 PM   #16
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There is no much help from you guys... And I do know that there are quite a few really good on engines in here somewhere...

So i'm going to remove the engine and try to find it out by my self... (I'll have to rent a garage with nececery equipment to accomplish this!!!).
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Old 01-24-2011, 06:21 PM   #17
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So as can imagine, the PVC system (breather) is what is shown below in the picture (correct me if I'm wrong). The only thing that's may be foulty here is an air pupm (again, correct me if I'm wrong) as I can't imagine how air pipes can become blocked.... or maybe there is something more I should know???
Now the other thing: lets assume its pressure foult... what is the way to find the weakest link (leaking seal)??? or what are the best sequent steps for exact leak detection!!!
This picture looks like the secondary airinjection system. Runs vaccum but different from your vaccum pvc system thats probally causing your problem. A known problem on the 2.7 motor is the valve cover gaskets leak because of sludge build up in the pvc system. If you reach behind the valve cover on the drivers side and feel oil thats probally your best bet to the source. The valve cover gasket can leak as well as the cam plug gasket. on the front of the passenger side of the engine and on the back of the driver side. ECS tuning has a decent kit that works. But youll probally have to replace a round diaphragm that is connected to the driver side of the intake y pipe right on top of the motor. It seizes up and causes back pressure to blow out the gaskets. hope this was helpful
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Old 01-24-2011, 06:22 PM   #18
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also recommend the updated oil cap, also at ecs tuning
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Old 01-25-2011, 05:16 AM   #19
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also recommend the updated oil cap, also at ecs tuning
Could you please post a link or part # for the updated oil cap?
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Old 01-25-2011, 05:35 AM   #20
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Could you please post a link or part # for the updated oil cap?
http://www.ecstuning.com/Audi-All_Ro..._Cap/ES251141/
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Old 01-25-2011, 05:35 AM
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