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jexy05 Profile
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Date Registered: 09-2012
TOTAL POSTS: 17
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fixing an oil cooler leak


hi all,
im new on here and thought i'd add something to the technical/engine section.
i own a 2006 [sign in to see URL] X-Trail, during a routine service i discovered a leak from the oil cooler (which is actually a water/oil temp stabilizer but we will call it a cooler) on the back of the engine, i thought this would be fairly simple to replace and searched long and hard on this and other forums only to find out that nissan will only supply these as a complete spare part (confirmed at local nissan dealer at approx $500+...rip off), not being happy with this and being a mechanic myself i decided to dig a bit further and found out that they are almost identical to the part fitted on an SR series engine and in fact the seals are exactly the same.
i attempted to search for a seal from australia and o/s to no avail (i didnt trust the o/s sites anyway) and all i could find was what nissan listed as an o-ring which is really the gasket that seals the unit to the motor.
i got a standard seal from a mates spare SR20 oil cooler and took it to the local seal shop (renhel in dandenong) and they supplied me with an round o-ring that was almost identical in size and was the same material as the standard seal.
i removed the cooler and took it apart, cleaned up the surface, fitted the new o-ring with some permatex aviation gasket goop, tightened it down, and re-fitted it with the new $5 nissan gasket and problem fixed, no leaks, drips or any issues and saved a small fortune.
i know it sounds easy and for the most part it was (i did it on jack stands) but i did have to take the power steering line off, i also disconnected the hoses at the top because the clips were too hard to get to and this created a pain when trying to refit them and i had to wash it properly with degreaser afterwards (everything got covered in oil) but other than that it was smooth sailing, the best tip i can give you is mark the top and bottom half of the "cooler" to make it easy to line up the hoses again (i didnt but fluked it).
i hope this helps and i will try to create a procedure if i get some interest but in the meantime i will be happy to answer any questions relating to this if you want to contact me.
thanks.
Jex.

Last edited by jexy05, 24/Sep/2012, 3:12 pm
24/Sep/2012, 3:06 pm Link to this post Send Email PM   Send Private Message Blog
 
DJR9000 Profile
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Date Registered: 08-2012
Location: Blue Mountains NSW
TOTAL POSTS: 169
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Re:


Nice

Makes you wonder how much Nissan makes from selling the complete assembly when they could just sell the oil seals!

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Ben
Hazelbrook, Blue Mountains NSW
2002 T30 Ti Dark Blue Mica
24/Sep/2012, 9:43 pm Link to this post Send Email PM   Send Private Message Blog
 
jexy05 Profile
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Date Registered: 09-2012
TOTAL POSTS: 17
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Re: fixing an oil cooler leak


mate you said it, they are no different than other manufacturers, subaru used to do it with gear sets for the early bug eye wrx's.
24/Sep/2012, 10:13 pm Link to this post Send Email PM   Send Private Message Blog
 
John A H Profile
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Date Registered: 10-2012
TOTAL POSTS: 3
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Re: fixing an oil cooler leak


Hi jexy05 is the seal the one that is seals the round part similar to a diaphragm to the body of the oil cooler? I'd like to send a photo but I cant find that facility on the site.

John A H.

EDIT:

Photos posted

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Last edited by jalalski, 15/Oct/2012, 7:23 pm
15/Oct/2012, 1:51 pm Link to this post Send Email PM   Send Private Message Blog
 
LukeV Profile
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Date Registered: 04-2013
TOTAL POSTS: 3
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Re: fixing an oil cooler leak


Hi,

I too had a leaking oil cooler in my 2006 Xtrail QR25DE. It was causing a lot of smoke, so at least it didn't go un-noticed for long.
My mechanic replaced the original o-ring seal with a rubber O-ring after I mentioned the OP's post.
However, it has now started leaking again and is slowly getting worse emoticon

I was wondering if anyone else has any suggestions on the type of seal to get? He said the original was not a normal rubber o-ring.

Has anyone managed to tighten the oil cooler top bolt without removing the oil cooler or inlet manifold?

Cheers,

LukeV
1/May/2013, 8:38 pm Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5291
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Re: fixing an oil cooler leak


Hi Luke,
The service manual suggests removing the RH wheel and RH wheel arch undercover to gain better access.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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1/May/2013, 10:38 pm Link to this post Send Email PM   Send Private Message Blog
 
LukeV Profile
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Date Registered: 04-2013
TOTAL POSTS: 3
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Re: fixing an oil cooler leak


Thanks Kev,
Car is booked in to the mechanics again on Tuesday. I don't think you could get to the top nut even with the RHS wheel off.
As Nissan don't sell the O-Ring as a separate part, I figure the oil cooler isn't designed to be pulled apart while in place.

3/May/2013, 5:28 pm Link to this post Send Email PM   Send Private Message Blog
 
jexy05 Profile
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Date Registered: 09-2012
TOTAL POSTS: 17
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Re:


hi again, it's been a while and I have not checked this thread but if you have a specific question then please pm me direct.

update.
my oil cooler is sealed up and working perfectly, after finding a small leak I re-tightened the bolt again in the car, it was hard and i used a hoist for that one but after that it sealed perfectly, don't worry about a specific torque setting just do it up VERY TIGHT, it worked for me. I've been on a 4000k trip since and it's worked perfect and still is.

I've been reading some of the replies on here I will try to answer them individually.

I have also had a couple of pm's regarding seal sizing, I do not know what the size was but I bought mine from RENHEL in Dandenong and they had it on the shelf as a stock item, I bought the orange seal as they are oil resistant and made from the same material as the original seal, they are available.
If someone else finds one maybe they can post the size up here, I am not puling mine apart again but if I can find another seal ill go and get the size sometime in the future.


john: yes it is the seal that goes between the main body and the cap, don't forget to mark the top and bottom sections before taking them apart so they can go back together in the right place, it was a bugger to get it right once I had fitted it back the car.

lukev: I had the same trouble did the mechanic lather the sealing faces with permatex before re-fitting? because the original seal is square and the new one is round you will need to seal it properly and TIGHTEN IT HARD, I had a small leak when I re-fitted it and managed to get a spanner on it and get that extra turn out of it and it's fine now and I went on a 4000k trip around oz after I fixed it. it is impossible to do it while it's in the car, pm me your number and ill be happy to call you.

revhead kev: I removed the rh wheel, took of the p/s pump hose for clearance and then removed the whole unit as one with the hoses attached, I then removed the hoses and ran them back under the manifold and re-attached them after I bolted it back in place, it's fiddley but it can be done but not on the car, new gasket from cooler to block is avail from Nissan for nix.

hope this helps a bit more.
15/May/2013, 11:20 am Link to this post Send Email PM   Send Private Message Blog
 
UNM Profile
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Date Registered: 07-2013
TOTAL POSTS: 4
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Re:


My x-trail has been dripping for quite a long time now. Looking at other fora, it seems to be a common issue with this type of cooler (pathfinder and SR20 engines also use a similar one). As they age, the seals gradually start to weep.

I managed to remove the cooler without having to take off the power steering hose. It is tight, but possible as long as you have different socket extension bars to work on either side of it.

As soon as I detached the cooler, I slid an old sock over it to protect the machined face.

I left the coolant hoses attached until after detaching the cooler from the engine block. I removed them pretty much by touch once I could turn the oil cooler around to get access. I used a couple of PVC irrigation pipe end pieces to stop all the coolant leaking out. You have to be quick when disconnecting the hose, but it saved me a complete coolant change (just did that about 3 months back).

Now to the really important stuff.
I went to a seal specialist who sold me a length of 6mm round O-ring material (nitrile rubber). I formed this into an o-ring using superglue, as recommended.

The seal removed has an outside diameter of 75mm, inside diameter of 62mm and is a rectangular cross section with a thickness of [sign in to see URL] when removed. A 6mm thickness for new seal is what I (and the guys at Hallite) recommend for a replacement.

The smaller O-ring for the top bolt is easier to source - the original is internal diameter of 23mm (outside diameter 30mm) and requires 3mm thickness (you can probably go slightly thicker here too if you want).

If given a choice of material, nitrile seems to be recommended by most places. One place said silicone and another said to avoid silicone and use EPDM or nitrile. Given everyone says nitrile is OK, that was my choice.

Recommended torque for top nut is [sign in to see URL] and mounting bolts [sign in to see URL]

Only just finished putting my x-trail together again, will update if there are any problems, but looking good for now.
29/Jul/2013, 9:02 pm Link to this post Send Email PM   Send Private Message Blog
 
valkie Profile
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Date Registered: 04-2014
Location: Central Coast NSW
TOTAL POSTS: 84
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Re:


I have just found some oil on the rear engine torque bar that attaches to the engine mount
Was this a symptom you found when you noticed the oil cooler leaking
The oil on my engine torque shaft is not dripping and appears to be more the result of a long term very small leak

I have just purchased this car and Im basically broke
So serious repairs are of great concern to me and my hip pocket

If I leave this repair for a while is there any chance of it getting worse or causing catastrophic failure of something?

---
2010 T31 Series III 2.5 White Automatic CVT
A vehicles real purpose in life is to tow a boat
Guy Fawkes is my hero (Born 13/4/1570, Murdered 5/11/1605)
He was only trying to do the right thing
16/May/2014, 9:34 pm Link to this post Send Email PM   Send Private Message Blog
 


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