Leaking oil, what is it? - JeepForum.com
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post #1 of 38 Old 04-04-2019, 03:37 PM Thread Starter
Brizzzle
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Leaking oil, what is it?

Just bought a used 2008 GC CRD Overland 184000 km a couple weeks ago. I noticed a leak showing up where i park drips are a bit off centre closer to passenger side. Reguardless i look underneath and the main drip shows up off the skid plate right where the oil pan access bolt is.Its not coming from the plug. I have pictures attached to follow please help if you have any idea.
I pulled all the guards off and i noticed fresh oil around that orange access plug which gives access to the crank case i believe? ( sorry im not really sure whats what but im learning). Pics 1 and 2 Is that where the rear main seal im reading about that leaks?
Also continued down i removed the plastic guard by the transmission i noticed an oily wetness on it , upon removal see pics 3,4,5 and you can see where its coming from around the transmission pan . I cant tell if its the pan itself or the from those big bolts above it that mount the transmission itself ( i believe)

Plz see pics and let.me know what you think and what should be done. Thanks so much!
P.s (i dont know how to add pictures properly like most do it so im hoping the attachments are fine)

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post #2 of 38 Old 04-04-2019, 04:09 PM
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If your crankcase is pressurized like that, I would first check the PCV valve. The intent of that system is to run the crankcase below atmospheric pressure to:
1. Avoid air pollution through venting oil vapor to the environment;
2. Preclude crankcase explosion in a diesel. Big diesels have had this for many years.

The PCV valve on the gas engines is simple; I gather (from posts on this forum) that it is more complex on the 3.0L CRD. Other members can probably provide a quick method for you.
Also, clean up the areas with a light power wash (like the self-serve type) to start fresh in finding the source.

Let us know what you find. Hope it is that simple.

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post #3 of 38 Old 04-05-2019, 10:51 AM Thread Starter
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Yes maybe I could look into changing the PCV valve oh, I have looked at it and the hoses passed it to the intake there is some oil residue and like many others on the crd they had oil leak through the orange gasket mine has the updated black one already but clearly there was some oil leaking below the turbo intake at one point it's all black in there. Anyway if the PCV valve wasn't working properly basically what we're saying is it could blow oil out of the crankcase seals?

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post #4 of 38 Old 04-05-2019, 01:16 PM
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Yes, it keeps the pressure from building up. If the valve fails, sometimes you get a leak, sometimes oil in the intake. I've only had gas engines, so maybe the effects are a bit different with yours.

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post #5 of 38 Old 04-05-2019, 01:33 PM
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Quote:
Originally Posted by Brizzzle View Post
Yes maybe I could look into changing the PCV valve oh, I have looked at it and the hoses passed it to the intake there is some oil residue and like many others on the crd they had oil leak through the orange gasket mine has the updated black one already but clearly there was some oil leaking below the turbo intake at one point it's all black in there. Anyway if the PCV valve wasn't working properly basically what we're saying is it could blow oil out of the crankcase seals?
The PCV is designed to pull a small vacuum (i.e., negative pressure) in the crank case and anything in free communication with the crankcase, such as the rocker arm cover area. there is normally a fresh air makeup into the crankcase from the clean side of the engine air intake or through a filtered opening in the valve cover area. I was suggesting that you pull that connection to see if the PCV system is actually generating a vacuum drag. Verify with a compound gauge or by putting your finger over the clean air intake fitting.

Combustion chamber blow-by tends to add pressure in this semi-confined space. The more the blow-by from the rings (either excessive leakage per stroke or total blow-by due to higher engine speed, the more it will try to pressurize the enclosed volume. Oil vapor above the liquid level in the pan will get pushed out with the escaping gas through the closest vent path with low resistance.

Prior to the 1960's, cars vented their crankcase directly to the atmosphere via a large vent pipe under the engine. In the current engine configurations, the PCV system pulls the vented oil-laden air mixture into the intake manifold for combustion with the fuel/air mixture.

Specific details into your 3.0L CRD will need to come from other Jeep Forum members who own a diesel. Also, I would suggest checking the D-I-Y sticky and the how-to's provided by Chirpz. They are very well done. You might even send him a PM directly.

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post #6 of 38 Old 04-05-2019, 01:48 PM
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@Walt has a good suggestion.

The valley drain dumps oil accumulating in the valley out the back like that so I would bet dollars to donuts that your oil leak is coming from the top of the engine.

A very common leak is from the oil cooler bolted down in the bottom of the valley. I have replaced the seals on 3.0l oil coolers numerous times. I think the turbo pedestal also leaks sometimes, worth replacing the seals if you go in there.

The other suggestions are much more DIY and much cheaper so worth looking into.

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post #7 of 38 Old 04-05-2019, 10:14 PM Thread Starter
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Thanks Walt, i will try to check fornvacuum through the PCV, i have read a few posts and tutorials of Chirpz and i read lots about the elephant hise mods. Appreciate your reply and i will check that.
Also today i went to check those areas again under my skid plates for the leak after a few days of driving. Those last pics were when i first uncovered and then i cleaned it all best i could after that and chexknit all today... pics are attached...

I noticed the drips on my transmission bell housing and i just wasnt convinced it was coming from it itself... closer inspection shows black oil residue coating the top portion and looking way up i can see wet on these hoses in picture... they lead to the upper right portion area to the right of my turbo. Now ill need some crd wk owners to chime in as im sure as 2005JGC has stated this leak is coming from the top somewhere theres a black square fitting that has elextrical it looks like it could come from there or theres these mercedes plugs one in the deep crevace is wet maybe from there? And theres a puddle of qey oil in this spot in these region ..... any ideas from these pics?
I dont doubt its related partially to this pcv valve so ima check on that pronto.... will the elephant hose mod help with pressure or no? Or is that just mainly to save the turbo intercooler of blow by oil

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post #8 of 38 Old 04-05-2019, 10:24 PM Thread Starter
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These pics i believe show precisely where the main leaking oil is coming from ( sorry forgot to attach in last post) sorry if you cant see well in these pictures i did my best.
The first 4 pictures are from underneath and centre of the pic shows the wet spot i see as high up as i could see. Its dripping off two hose which are under this black square thing which is driver side right side of the turbo and at the back close to the firewall.

The next 5 photos are diferent angles of the wet area to the right of the turbo, looking from the to. Maybe that electrical connector has a seal gone bad?
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post #9 of 38 Old 04-06-2019, 12:47 PM Thread Starter
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Side notes,
- recently changed oil and thats when it first became noticable
- put in 9.5 litres it come up a little over half on the readout when warmed. So ifigured thats good and thats what ive read.
- did notice once after checking the oil it was reading past all the marks like it shot up or something at one time driving....
-I had noticed a clear oily substance on my coolant reservoir lid when i first got it, didnt know why or where. Cleaned that all off and for a while i seen nothing appear from anywhere. Today i noticed a little bit on the top edge of the air filter box. Its not water but it is a little oily and seemd pretty clear on my finger (fine oil vapour?). which closest thing is oil dipstick which is right there within 3 inches . Seems all like back pressure to me. High oil pressure

Im hoping replacing or cleaning PCV valve if i can or replace, doesnt bother me..
Then carriying out with the elephant hose mod..

- front right side of my intercooler shows oil coming out, initially it looked like oil coming out of the driver side hose clamp but cleaned that off and it appears clean still.
- wet area still showing up in bottom right of intercooler.
There is rock damage to the bottom right of it for sure, im thinking i need to replace that for sure aswell, not sure if theres relevance though????

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post #10 of 38 Old 04-08-2019, 01:28 PM Thread Starter
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Quote:
Originally Posted by Walt View Post
Quote:
Originally Posted by Brizzzle View Post
Yes maybe I could look into changing the PCV valve oh, I have looked at it and the hoses passed it to the intake there is some oil residue and like many others on the crd they had oil leak through the orange gasket mine has the updated black one already but clearly there was some oil leaking below the turbo intake at one point it's all black in there. Anyway if the PCV valve wasn't working properly basically what we're saying is it could blow oil out of the crankcase seals?
The PCV is designed to pull a small vacuum (i.e., negative pressure) in the crank case and anything in free communication with the crankcase, such as the rocker arm cover area. there is normally a fresh air makeup into the crankcase from the clean side of the engine air intake or through a filtered opening in the valve cover area. I was suggesting that you pull that connection to see if the PCV system is actually generating a vacuum drag. Verify with a compound gauge or by putting your finger over the clean air intake fitting.

Combustion chamber blow-by tends to add pressure in this semi-confined space. The more the blow-by from the rings (either excessive leakage per stroke or total blow-by due to higher engine speed, the more it will try to pressurize the enclosed volume. Oil vapor above the liquid level in the pan will get pushed out with the escaping gas through the closest vent path with low resistance.

Prior to the 1960's, cars vented their crankcase directly to the atmosphere via a large vent pipe under the engine. In the current engine configurations, the PCV system pulls the vented oil-laden air mixture into the intake manifold for combustion with the fuel/air mixture.

Specific details into your 3.0L CRD will need to come from other Jeep Forum members who own a diesel. Also, I would suggest checking the D-I-Y sticky and the how-to's provided by Chirpz. They are very well done. <img src="https://www.jeepforum.com/ubb/2thumbup.gif" border="0" alt="" title="2 ThumbsUp" class="inlineimg" /> You might even send him a PM directly.
I want to check that my PCV system is actually generating a vacuum drag , i just cant figure out where to check ? Would that be just disconnecting the hose after the pcv valve and checking for suction there on the hose bot the valve???

I did remove the valve itself and blowed air goes through positive both ways. And i connected a vacuum to both side and it sucks through that valve both ways. I noticed woth the vacuum test it sucked real hard for a second then closed off a little bit both ways. But it did not lose suction on one end or the other. Does this mean its bad?

Incase you cant tell what i mean , cuz it sounds confusing. I sealed a vacuum hose one way and it still sucks my skin flat on the other side of the valve. Works like this both ways

..

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post #11 of 38 Old 04-08-2019, 01:37 PM Thread Starter
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Quote:
Originally Posted by 2005JGC View Post
@Walt has a good suggestion.

The valley drain dumps oil accumulating in the valley out the back like that so I would bet dollars to donuts that your oil leak is coming from the top of the engine.

A very common leak is from the oil cooler bolted down in the bottom of the valley. I have replaced the seals on 3.0l oil coolers numerous times. I think the turbo pedestal also leaks sometimes, worth replacing the seals if you go in there.

The other suggestions are much more DIY and much cheaper so worth looking into.
I have read lots since all this i hope its not the oil cooler, im going to try and get a view of the valley drain hole that the leak originates from for the oil cooler seals leak. Not sure if i can see it.. this weekend i was way under there again cleaning it all off and getting a look. Its definetly coming from top, you are right. Not rear main seal. I just wonder if its not the oil cooler seals, is there anything else it can be right there?. Theres this metal guard over a sensor right in the top driver side of the bell housing( not sure what it is but it looks like it could be a fitting that leaks).

Also after cleaning the leaks i had the jeep starting and my wife pressing the gas raising the rpm and all that i could not see it leaking. Only after a drive and then shutting the vehicle off i swear it just starts running down that housing.....
Would this sound like oil cooler leak? I came across a thread or 2 with this same leak symptoms but no conclusion... thanks aby help appreciated i dont want to bring this to a shop for diagnosis and be at theiir mercy.... i will to fix it depending but i want to be 98% sure i know what it is and where its coming from..

P.s i belive im a bit full of oil, its reading on the max line adter driving and checking 20.mins later. Im getting an extractor today to pull out some 1/2 litre or so..

Thanks any help is much appreciated and i know there tonns of threads with similar instances, each situation is different and TBH ive read hours and hours and ive learned alot but need to learn more
.

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post #12 of 38 Old 04-08-2019, 07:05 PM Thread Starter
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This is where the leak is coming from i cleaned checked cleaned checked. It only starts dripping after a drive and it seems like its right where a horizontal mount and verticle mounts meet on the driver side of the bellhousing .. im going to remove my driver front wheel and fender guard and see if i can get a better look at that angle. Its clearly not coming from the top of the housing. See pics. ( last pic is an angle at it facing the rear i reached my hand in to take some pics backwards.) What do ya guys think?
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post #13 of 38 Old 04-08-2019, 07:58 PM
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https://fifthgear.biz/fifthgear-blog...ng-oil-cooler/

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post #14 of 38 Old 04-08-2019, 10:29 PM
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Also that breather hose looks like ***

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post #15 of 38 Old 04-10-2019, 08:42 PM Thread Starter
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Heres a few pics looking at the area through the driver side fender , after removing the guards. The leak is coming from that one bolt in the center of the 2nd pic i belive.. its definetly not coming from above that. What kind of seal would be there to replace?
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