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Thread: Removing the pre-cat on a Z19DTH (and smashing the insides out!)

  1. #1
    Regular Member Neve'o's Avatar
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    Vehicle : Vectra SRi 150 Hatch

    Trim : SRi

    Engine : Z19DTH

    Year : 2008

    Mileage : 69'000

    Default Removing the pre-cat on a Z19DTH (and smashing the insides out!)

    Hi guys, I'm looking to remove the pre-cat on my 07 vec over the Easter weekend (I have the z19dth), it will involve me removing most of the exhaust as I'm upgrading and while I'm there I'm chopping the main cat out, now this is all fairly straight forward but I'm looking for advice regarding the pre-cat.

    I intend to smash the insides out however is it best to remove the pre-cat from the turbo or can it be done in place easier enough? If I remove it to complete the job what's needed with regards to gaskets etc for refitting?

    Also what's a good way to remove the insides, a big drill bit or a hammer and chisel?

    My z20let was a pain in the rear to get it to seal again after having the pre-cat off and I want to avoid this if possible!

    Any help from those more experienced is greatly appreciated!

  2. #2
    Regular Member Learch's Avatar
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    Vehicle : Vectra c

    Trim : LS

    Engine : Cdti 8v


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    I'd take the pre cat off as the amount of beating you will give it is likely to crack something as the casting on the turbo isn't designed to take repeated shock.

  3. #3
    Regular Member Mark-R's Avatar
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    Vehicle : GSI

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    Engine : 3.2 v6

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    I would remove it i did my old 1.9 while still on the turbo and 3 months later the turbo went im not saying it was cos of all the vibration but better being safe than sorry.

  4. #4
    Regular Member Neve'o's Avatar
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    Vehicle : Vectra SRi 150 Hatch

    Trim : SRi

    Engine : Z19DTH

    Year : 2008

    Mileage : 69'000

    Default

    Ok sounds like good advice! What's needed with refitting the pre-cat, gaskets etc? Possible to re-use the old ones or do you need new?

    And I will remove the 02 sensor before the bashing begins lol.

  5. #5
    Moderator & Events Assistant paulhb's Avatar
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    Vehicle : M5

    Trim : Nothing needs adding

    Engine : 5.0 V10

    Year : 07

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    A new triangular gasket is a wise move and not expensive, the clamp between the turbo and the precat pipe can get rusty a new one is about £6 and saves grief if you need to cut the old one off, I brought a new one as replacing the turbo in a couple of weeks time.

  6. #6
    Regular Member Neve'o's Avatar
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    Vehicle : Vectra SRi 150 Hatch

    Trim : SRi

    Engine : Z19DTH

    Year : 2008

    Mileage : 69'000

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    Cheers for the reply Paul, so there's no gasket between the turbo and pre-cat?

  7. #7
    Regular Member Teapot's Avatar
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    Vehicle : Signum

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    Engine : 1.9 CDTI 150

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    The joint between the turbo and pre-cat is a conical flange clamped together with a ring-type compression clamp. It just needs to be thoroughly cleaned with a wire brush and then wiped with brake cleaner to ensure a good seal.

  8. #8
    Regular Member Neve'o's Avatar
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    Vehicle : Vectra SRi 150 Hatch

    Trim : SRi

    Engine : Z19DTH

    Year : 2008

    Mileage : 69'000

    Default

    Good to hear, thanks very much. The pre-cat on my Z20LET also had the same type of flange but it did have a gasket in there too so was just making sure, good news I found the triangle gasket for a couple of quid!

    Worth me doing a how-2?

  9. #9
    Moderator & Events Assistant paulhb's Avatar
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    Always worth a How 2 someone else might need some guidance!

  10. #10
    Regular Member Mark-R's Avatar
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    Vehicle : GSI

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    Year : 2004

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    I found it a pain to split the turbo from the pre-cat and that was the turbo off the car as the spring clamp is a tough git to open lol

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