Identify my Z25
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Thread: Identify my Z25

  1. #1
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    Identify my Z25

    So is my Z25 maybe the updated or not?

    The axle has like 0.5 - 1.0 mm play back and forth and little upside down movement, does not feel like its binding on the clutch gear.

    Im told this Z25 is changed like 6 months back, but it seems like the axle has somehow "sunken" in the gear? I might be wrong though...

    Have not checked the other end yet to see what kinda washer it has.
    Attached Thumbnails Attached Thumbnails Identify my Z25-z25-1.jpg   Identify my Z25-z25-2.jpg  

  2. #2
    King of the Group-Buys Laurencewhite's Avatar
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    Looks like an upgraded one to me but one way to be sure is to remove the shaft to see if it has 1 oil hole. The original shafts had 2 oil holes along it's length.
    Laurence

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  3. #3
    Senior Member Engenia's Avatar
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    I agree with Lawrence. It looks like an upgrade.
    The originals retained the sand cast finish, although I do have one that has been machined smooth - rightmost in the pic below
    upgrades are generally machined rough. You can see the resulting concentric circles that remain.
    Identify my Z25-202009281116.z25examples.jpg
    Measuring the diameter, from 2 teeth on one side to 1 on the other you will find anything from 76.38 to 76.42
    I measured a new one at somewhat under 76.36 but I don't remember exactly. I think I've posted a pic of it but can't find it at present.

    The shaft position in the gear is not generally relevant. There should be some noticeable end play (certainly no more than 1 mm), but axial play should be at a minimum - barely noticeable.
    While you are there, check the shaft bolt torque. There should only be a Belleville washer under the bolt, nothing else. I've seen people put flats under then, and that can be disastrous, especially if they aren't high tensile.
    Last edited by Engenia; 09-27-2020 at 07:39 PM.
    hooroo, Errol www.engenia.com.au [139,200 km - and counting .....]

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    Thanks for the help, going to check the other end later in the evening.

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    So then, i checked the alternator end.

    The bolt is tight as hell, but the alternator flange is so loose you can wiggle it, dont understand. Its like the washer isn`t pressing against the flange at all?

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    Seems it has had a straight washer, and the flange and axle is now fooked....

  8. #7
    GBo
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    Quote Originally Posted by Finnelli82 View Post
    So then, i checked the alternator end.

    The bolt is tight as hell, but the alternator flange is so loose you can wiggle it, dont understand. Its like the washer isn`t pressing against the flange at all?
    I wonder if that is because the shaft is slightly pulled through the gear?

  9. #8
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    Thats what i thought too! Might be...

  10. #9
    Senior Member Engenia's Avatar
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    Quote Originally Posted by Finnelli82 View Post
    So then, i checked the alternator end.
    The bolt is tight as hell, but the alternator flange is so loose you can wiggle it, dont understand. Its like the washer isn`t pressing against the flange at all?
    The Belleville washer should have it's outside edge touching the flange, and for that to work, the shaft should not quite protrude.
    It needs to come out to find out what's going on.
    Unlikely that the shaft has pulled through the gear. It's a shoulder, not a taper fit.

    Actually, that's not quite true. The gear comes up against a shoulder, but the shoulder has a taper which fits inside the gear, locking it in place.
    Last edited by Engenia; 09-28-2020 at 11:15 PM.
    hooroo, Errol www.engenia.com.au [139,200 km - and counting .....]

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    It has no belleville washer, thats whats going on....

    Talk about a few euros worth of parts causing major damage.

    I must get a new set of the z25, axle, washer and flange.

    It does seem though that the axle has come through the z25 gear a bit, there is a bit of a burr on the axle end that indicates it to be sunken on the gear, maybe. Wonder if the missing belleville, and the added loosenes has caused the axle to hammer in the gear in back and forth motion?
    Last edited by Finnelli82; 09-29-2020 at 12:06 AM.

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