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Old 12-09-2020, 03:22 AM   #1
Oily
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Default 940 oil leak

My normally oil leak free car has seemed to develop a couple of leaks the biggest was sorted by getting a reconditioned steering rack but there is another smaller leak from between the oil filter to housing.

I have tried a new filter but still have the same problem, this seems like a very strange area for a leak and the housing looks undamaged, is this a common problem or have I just been unlucky.
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Old 12-09-2020, 03:38 AM   #2
hessam69
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Turbo 940?
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Old 12-09-2020, 04:05 AM   #3
Oily
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Yeah LPT 2.3
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Old 12-09-2020, 04:24 AM   #4
hessam69
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It sounds like your problem lies in the oil to water sandwich oil cooler housing
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Old 12-09-2020, 08:31 AM   #5
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As hessam said, this is quite a common place for leaks.
It leaked on my car.
The square O-ring was rock hard and crumbled into bits (part 5 on diagram, p/n 3547188)

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Old 12-09-2020, 10:50 AM   #6
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Check the condition of the PCV system: if plugged up or constricted it will likely promote oil leaks.
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Old 12-09-2020, 01:50 PM   #7
Oily
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Quote:
Originally Posted by Fa182 View Post
As hessam said, this is quite a common place for leaks.
It leaked on my car.
The square O-ring was rock hard and crumbled into bits (part 5 on diagram, p/n 3547188)

Thanks for that, I will order a new seal and hopefully that will solve it.
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Old 12-09-2020, 02:42 PM   #8
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While you're there, it's a good idea to check the coolant hoses (#11 & #14).
I replaced them.
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Old 12-10-2020, 10:35 PM   #9
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i did this recently, and getting that cooler housing bolt off was a pain in the rear. 27mm if i remember correctly.

since the hex is quite thin, and my deep sockets have a fair amount of lead-in, i bought a 27mm flat socket like this...

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

...because i wanted to be overly cautious to not round the hex.


am sure you could just ground flat a regular socket too, i just didnt have one spare. Suppose certain wrenches would also work if you have a kit.

I torqued this back to 40nm and so far no leaks.

Also, i second the hose replacement while your there- if, like mine yours have some degree of bulge.
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