4HP18 Trans Filter - XM, 605, Alfa 164, SAAB 9000
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  1. #1
    Contented Peugeot Driver addo's Avatar
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    Default 4HP18 Trans Filter - XM, 605, Alfa 164, SAAB 9000

    Consider this an incomplete thread for the time being.

    A picture of the tubular strainer (as PSA call it) filter that is accessed from under the car. ZF's number was 0501-311-497.

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    Filter construction is two layers of fine metal gauze with about 3mm of airspace between. Natural wear and tear in the transmission will result in particles blocking this filter, eventually causing a drop inline pressure. This could impact on shift quality and timing.

    Beware that many aftermarket filters don't come with the extra O-ring. The Beck-Arnley unit pictured is Taiwanese, and seems decently made. I cannot say where ZF's own filters are made, if they still offer them.

    Wildebeest's comments elsewhere about ZF castings, are a good caution. I have never had an issue with clean threads but they are very precisely cut with a full thread profile, and would thus not respond well to abuse with dirt, crossing or overtightening.
    Attached Thumbnails Attached Thumbnails 4HP18 Trans Filter - XM, 605, Alfa 164, SAAB 9000-4hp18_filter.jpg  

  2. #2
    Real cars have hydraulics DoubleChevron's Avatar
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    Just wash the existing one in petrol and refit That way you don't need to worry about the replacement filter fitting

    seeya,
    Shane L.
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  3. #3
    1000+ Posts robmac's Avatar
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    Quote Originally Posted by DoubleChevron View Post
    Just wash the existing one in petrol and refit That way you don't need to worry about the replacement filter fitting

    seeya,
    Shane L.
    If it's a dual mesh as Addo says then it could be impossible to remove the crud in between the two layers.

  4. #4
    Contented Peugeot Driver addo's Avatar
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    Aye; it's definitely dual mesh that could clog.

    I'm not spruiking these things (I only bought enough to cover myself and two other people who wanted one), it's more a part of my reasoned counterpoint to ATF hysteria.

    The cover O-ring should be replaced, whether you are washing the old filter and refitting, or playing cautious and changing it out. As Shane would know, old O-rings turn into something resembling coal; completely lacking the compliance needed to seal.

  5. #5
    Budding Architect ???? pugrambo's Avatar
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    looks like a dishwasher strainer

    reminds me i should look at doing the 605 very shortly as a precaution
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  6. #6
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    Quote Originally Posted by DoubleChevron View Post
    Just wash the existing one in petrol and refit That way you don't need to worry about the replacement filter fitting

    seeya,
    Shane L.
    Exactly what I've been doing for the last 3 years - and by the amount of muck originally caught in mine, it had probably never been cleaned before, let alone replaced.

    Since mine is probably now 17 years old, perhaps replacing it is a sensible bit of preventative maintenance...

    Cheers

    Alec

  7. #7
    Too many posts! JohnW's Avatar
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    Quote Originally Posted by Armidillo View Post
    Exactly what I've been doing for the last 3 years - and by the amount of muck originally caught in mine, it had probably never been cleaned before, let alone replaced.

    Since mine is probably now 17 years old, perhaps replacing it is a sensible bit of preventative maintenance...

    Cheers

    Alec
    Only if the holes are bigger now or it looks like cracking and letting things past!!

    I'd replace it though, if it were mine, just for peace of mind.
    JohnW

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