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Old 12th July 2023, 08:04   #1
stocktake
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Default Interesting Oil leak

Never had that one before, noticed patch of oil on the drive and removed undertray to reveal a steady drip from the flange on the end of the oil cooler (early type) and a whole lot of oil covering the undertray.
Had to drain the water but after I did this and I next removed the end plate of the oil cooler only a cupful or so of oil is lost. Just enough room to remove the endplate without having to remove the cooler itself.
Its a combination of a large O ring and a metal gasket on the end of the cooler and the metal gasket had failed. most unusual.
Luckily I had in my stash the metal gasket so after half an hour in the shed trying to find it, stealing a cardboard nail file from the wife to clean the surfaces and an hour or so under the car all is well. Just need to clean the undertray up now
Not my idea of a nice lazy afternoon watching the showers come down but at least being under the car only my legs got wet and the oil in my hair stops the grey from showing so much
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Old 12th July 2023, 08:54   #2
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Originally Posted by stocktake View Post
Never had that one before, noticed patch of oil on the drive and removed undertray to reveal a steady drip from the flange on the end of the oil cooler (early type) and a whole lot of oil covering the undertray.
Had to drain the water but after I did this and I next removed the end plate of the oil cooler only a cupful or so of oil is lost. Just enough room to remove the endplate without having to remove the cooler itself.
Its a combination of a large O ring and a metal gasket on the end of the cooler and the metal gasket had failed. most unusual.
Luckily I had in my stash the metal gasket so after half an hour in the shed trying to find it, stealing a cardboard nail file from the wife to clean the surfaces and an hour or so under the car all is well. Just need to clean the undertray up now
Not my idea of a nice lazy afternoon watching the showers come down but at least being under the car only my legs got wet and the oil in my hair stops the grey from showing so much
Hi Dave.
Hope all is well with you and Marina, i am presumably thinking you must have known about this problem or at least read about it somewhere before, i say this because you had the gasket in stores to fix it, did you take any photos while you were getting your hair dyed.

It wont be to long before i too will be lying under the tourer once the weather is ok to do the Auto box oil change, that's if the old back and legs allow it
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Old 12th July 2023, 09:31   #3
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Hi Dave.
... did you take any photos ...
That's just what I was thinking Steve, particularly as my car is a similar age to Dave's with the early type of oil cooler.

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Old 12th July 2023, 09:59   #4
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I didn't take photos as I was rain dodging, but, I have a spare oil cooler that I stripped and inspected before I attempted to work on the one on the car. I will take some photos and add them. Very interesting to see the inside of the oil cooler and also to discover the two O rings that could be a cause of water/oil contamination in the cooler.

As for the gasket, no idea where it came from I certainly didn't buy it and until I stripped the spare down I didn't know what it was for.
Pictures soon
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Old 12th July 2023, 10:06   #5
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Ditto - most V6s here are early types so a photo would add to understanding.

I've had an oil leak, and earlier this spring another owner, from the hoses but the oil cooler leak is a new one on me. (https://the75andztclub.co.uk/forum/s...d.php?t=282657).

Dave's wife might not miss the one nail file, on the other hand she should be grateful that the undertray won't fit into the dishwasher unlike the VIS motor housings

Keep well
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Old 12th July 2023, 10:34   #6
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Here you go, the other end of the cooler is identical fitting wise but the exit/entry is a 90degree bend as opposed to straight. The inner tube simply slides out. it is sandwiched in between the O rings and gasket.


O ring and gasket still in place

O ring removed

Gasket removed

Close up of oil cooler end plate, gasket and O ring

Withdrawing cooling tube

Tube removed

looking down tube

Looking down casing
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Last edited by stocktake; 12th July 2023 at 16:14..
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Old 12th July 2023, 11:58   #7
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Very interesting to see the inside of the oil cooler and also to discover the two O rings that could be a cause of water/oil contamination in the cooler.

Excellent photos Dave, thanks very much, and great news that the original cooler can be dismantled and repaired if the 'O' rings are at fault which I'd have thought is likely.

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Old 12th July 2023, 16:20   #8
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Dave's wife might not miss the one nail file, on the other hand she should be grateful that the undertray won't fit into the dishwasher unlike the VIS motor housings

Keep well
Really do miss the "thanks" button
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Old 12th July 2023, 16:30   #9
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HI Dave.
Nice bunch of photos we all now know what your referring to and how the cooler is put together

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Old 14th July 2023, 09:00   #10
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Nice set of photos Dave. Luckily? mine is the later type? Should keep my mouth shut now.
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