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Old 12-28-2008, 10:12 AM   #1
pupilot007
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2002 L-Series 3.0L Sedan
Default Oil cooler line o-rings?

For any tech geeks, I've got a slow oil leak about mid engine, right above the oil filter housing. It started right after I had fixed my oil cooler. I THINK its its one of the oil cooler inlet lines that attaches right above the oil filter housing. I have tried tightening them up as much as possible, but I still have the slow leak. Is there a small o-ring that is supposed to be on those lines? Or does something above all of that typically leak too. Thanks.

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Old 12-28-2008, 11:49 AM   #2
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Default Re: Oil cooler line o-rings?

The oil cooler itself is a known leak problem. What do you mean by "fixed my oil cooler"?
Oil cooler requires a special high temp, oil safe sealant when it's been taken apart and put back together, that's the reason there's a TSB on oil cooler leaks, factory used the wrong sealant on early L's.

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Old 12-28-2008, 12:05 PM   #3
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Default Re: Oil cooler line o-rings?

I mean I had the leaking antifreeze from the bad sealant. That problem is totally fixed now. However, to get to oil cooler, I had to remove the inlet lines that run down to block just above the oil filter housing. They are two aluminum tubes that are U shaped and about 4 feet long if straightened. I am wondering if there is/was supposed to be a small o-ring on the end of the tube that attaches just above the oil filter housing.

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Old 12-28-2008, 12:18 PM   #4
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Default Re: Oil cooler line o-rings?

I have one apart at work, I can let you know tomorrow (Monday)

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Old 12-28-2008, 01:00 PM   #5
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Default Re: Oil cooler line o-rings?

Thought I'd post this while waiting for the real answer from IMkenNY.

I didn't replace any gaskets or O-rings down there when doing my oil cooler fix, just slid them back in and tighten them down. Maybe you have some random bottom of the engine gunk between your lines and the block. Either that or I got real lucky when putting mine back together without replacing a seal/gasket.

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Old 12-29-2008, 07:10 AM   #6
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Default Re: Oil cooler line o-rings?

That was my thought. Maybe a little junk got in the threaded fitting and is creating a small leak. We'll see what IMkenNY finds.

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Old 12-29-2008, 09:06 AM   #7
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Default Re: Oil cooler line o-rings?

I just took a look at one of the lines and its just a metal flare (no oring or gasket). Ill try to get a better look at the block receiver this afternoon.

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Old 12-29-2008, 08:31 PM   #8
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Default Re: Oil cooler line o-rings?

I didnt have a mirror to see the inside of the block receiver (direct engine view was blocked by radiator) but I did not feel anything but metal with my finger.

It sounds like your leak is from dirt or a cracked flare.


Im working on a 3.0 Vue that I picked up off Ebay with a known oil cooler leak/ clogged heating and cooling system.

Its amazing what a mess this leaking oil cooler did (lots of oil leaked into coolant) ...... massive dex sludge!

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Old 12-30-2008, 10:37 AM   #9
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Default Re: Oil cooler line o-rings?

Thanks for looking. I'll pull it apart and check it out.

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Old 01-24-2009, 10:34 PM   #10
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Dizzy Re: Oil cooler line o-rings?

Im working on my oil cooler now. If the germans built this engine its no wonder thay lost the war! I spent 21 dollars on a 19mm flare wrench and still cant get the lower oil lines loose. no room to move. can that oil filter holder be removed? and btw...what a great place to put the thermostat!!!
I had to buy a new set of star sockets now I need a 30 mm metric socket.
I certainly hope its the oil cooler after all this work. I can see the cover is not leaking...if its the cooler can it be brazed?

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Old 01-25-2009, 08:33 AM   #11
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Default Re: Oil cooler line o-rings?

The oil filter housing is held on by a single center bolt that you will need a 12mm hex to remove it.

If you have oil leaking into your coolant the oil cooler itself is not repairable and must be replaced.

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Old 01-27-2009, 01:02 AM   #12
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Default Re: Oil cooler line o-rings?

The oil cooler lines can be removed with a 3/8 drive offset socket set. I had to spend about $70 at Sears to get a set, but it worked.

I will admit it did take a long time to remove and re-attach.

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Old 01-29-2009, 08:41 PM   #13
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Dizzy Re: Oil cooler line o-rings?

I go my cooler out and sitting in carb cleaner. if there is a leak, instead of spending 400 on a new one can I plug the oil cooler holes in the block? I dont see how this is supposed to work anyway...bathing 220 degree oil in 200 degree water? I just want to sell this car. what do you think. what size bolt would I need to plug it up? thanks again guys.........

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Old 01-29-2009, 10:19 PM   #14
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Default Re: Oil cooler line o-rings?

I dont think you would want to block the oil flow that is designed to go through the oil cooler. A alternative solution would be use those engine block ports to feed an external cooler. I wouldnt think the hassle of sealing the old cooler location and running new lines to an external cooler is worth it though.

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