Leaking oil filter housing
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  1. #1
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    Leaking oil filter housing

    My 99 1.8 is leaking oil from the top of the oil cooler and filter holder, just above the two water hoses. On this housing there is also a port that is closed with a cap which opens with an alen wrench. It might be leaking from there. Or is it the pressure sending unit gasket? Has anybody seen this issue?

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  3. #2
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    The seal, which is between the oil cooler and the flange above it.
    Seam that it comes either with or without tabs, and either works.

    http://www.germanautoparts.com/Volks...t/Engine/146/5

    http://www.autohausaz.com/search/pro...0Cooler%20Seal

  4. #3
    2nd Gear
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    Definitely the gasket, they get hard and brittle, then fail in cold weather. There's a thread in the info heading for instructions, but here are the basics:

    Take off the oil filter, remove the nut on the filter mount threaded tube. Take the coolant expansion tank out of the way by removing the three mounting screws, then unplugging the wire connector. Flip it over with the hoses still attached. Now work from above, pry the oil cooler down (I was able to do this with the coolant hoses still attached, but if you have to remove tham, the coolant must be drained, too).

    Remove old crusty gasket. Clean top of cooler and engine block surface. Oil coat new gasket to help seal, then place on top of cooler, on tabs if it's that type. Bolt back together, install new oil filter (good idea to change oil while you're at it) and start up. Check for leaks and you're done. Don't forget to plug the coolant sensor back on the tank.

  5. #4
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    is there some kind of diagram of this unit so i can see which bolts to remove?

  6. #5
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    You remove the filter, then there is a 1 1/4"(guess) thin bolt holding it on that's all there is. It slides off the shaft. Fix it now before the oil gets in your coolant system. It would be a good time to flush and do an oil change. Most likely you'll need to replace the whole oil cooler. About $65 online. It is a mess. My seal broke and I had all of my oil in my coolant. 3 days of flushing and will never be fully cleaned out.

  7. #6
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    1 - 1/16th " deep socket; 27mm works also.

    If you don't have oil in your coolant or vice versa, it is not likely that you will need to replace the cooler. There is absolutely no interaction between oil and coolant at the seal, only if the cooler itself has an internal crack.

  8. #7
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    Thanks guys.

    I searched for this problem. Worked great, thanks for the help again.


    J.

  9. #8
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    Jan 2011
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    I did the same job today on my jetta and there is still a leak and I'm asking if it leaks because I had to hit the oil cooler where the filter sits, it is damaged, is it very important that this surface is flat?

  10. #9
    PZ
    PZ is offline
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    It has to be prefectly flat or it will leak. You willl need to replace the cooler.

  11. #10
    1st Gear
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    Oct 2009
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    Southern NJ
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    As Attofarad said, my oil cooler came with an o-ring that has two tabs on it. Are they supposed to align with anything on the cooler flange or do I just put it on there and tighten everything up?

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