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400 GT, 25581

Discussion in '365 GT4 2+2/400/412' started by dedo tanzi, Sep 22, 2020.

  1. dedo tanzi

    dedo tanzi Karting

    Dec 16, 2013
    51
    Lugano - SUISSE
    Full Name:
    DEDO - Alfredo
    Dear friends
    My 400 GT, 25581, year 1978, 80.000 km .... has finished its work to ... rejuvenate ...
    Now I miss "only" a nice overhaul to the gearbox, and to replace - among other things - those two bearings, which I have seen cost more than a Rolex .....
    Unfortunately they whistle, but much less in 4th gear, and I don't think adding miraculous additives, just to decrease the noise .... is the best solution!
    Have any of you already had this overhaul done by a good mechanic?
    Before delivering the car to the ... clinic, could I please have some very useful information?
    Thanks, from Switzerland
     
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  3. dedo tanzi

    dedo tanzi Karting

    Dec 16, 2013
    51
    Lugano - SUISSE
    Full Name:
    DEDO - Alfredo
    Buongiorno a tutti....:):):)

    Strano, davvero strano che nessuno dei " felici " possessori del 365/400/412 abbia mai fatto nessuna revisione al cambio MECCANICO, o ai suoi cuscinetti ......
    Speriamo per il meglio .... GRAZIE !!!

    PS) Scusa il mio terribile inglese ....: D
     
  4. raemin

    raemin Formula Junior

    Jan 16, 2007
    695
    Lyon (FR)
    Full Name:
    R. Emin
    The gearbox is not forgiving: once the synchronizer are worn-out, driving the car aggressively is a real challenge. On these cars none of the usual "old gearbox trick" work for me (operate the clutch twice, increase rpm,...), the only option is to slowdown...

    Maybe Kernite oil could do the trick on an old (but not wornout) 400 gearbox. This oil did did quite a good job in my old Alpine: the synchronizer would crack badly when the gearbox was hot (fixed with this sticky product).

    As far as an overhall is concerned: a not so perfect gearmesh can be adjusted (within limits), but you will need new synchronizer. I have not heard of any cheap source for such part, and I am not aware of them being re-manufactured.
     
    dedo tanzi likes this.
  5. dedo tanzi

    dedo tanzi Karting

    Dec 16, 2013
    51
    Lugano - SUISSE
    Full Name:
    DEDO - Alfredo
    Gentil Amico Raemin
    Grazie per la tua risposta ...

    I miei sincronizzatori sono perfetti, gli ingranaggi funzionano perfettamente ... solo i due grandi cuscinetti dell'albero principale che fischiano che è un " piacere".
    Tranne che in 4a marcia .... dove il rumore è molto più leggero ...
    Ho già provato con gli additivi, nascondono un po 'il fischietto, ma purtroppo non è quello che voglio ....
    (Ho anche provato ad alzare il volume della radio ....: D: D: D )

    Sto cercando qualcuno che abbia già fatto una revisione del cambio ....
    Ciao, dedo
     
  6. dedo tanzi

    dedo tanzi Karting

    Dec 16, 2013
    51
    Lugano - SUISSE
    Full Name:
    DEDO - Alfredo
    Caro amico Raemin
    La ringrazio per la risposta ...
    I miei sincronizzatori sono perfetti, gli ingranaggi funzionano perfettamente ... solo i due grandi cuscinetti dell'albero principale fischiano che è un "piacere".
    Tranne che in 4a marcia .... dove il rumore è molto più leggero ...
    Ho già provato con gli additivi, nascondono un po 'il fischio, ma purtroppo non è quello che voglio ....
    (Ho provato anche ad alzare il volume della radio ....: D: D: D)
    Sto cercando qualcuno che abbia già fatto una revisione dell'attrezzatura ....
    Ciao, dedo
     
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  8. raemin

    raemin Formula Junior

    Jan 16, 2007
    695
    Lyon (FR)
    Full Name:
    R. Emin
    If the sync are working properly and your only issue is a "noise annoyance" my personal advice would be to experiment with several oil additives prior to an overhaul. You should also validate first that the issue is not in the torque tube or rear diff.

    Take into account that engine, gearbox, torque tube and rear axle are bolted together as a "rigid" setup. In order to extract the gearbox, it is not a matter of unbolting the gearbox from the engine: one has to unplug the torque tube and dissociate the rear axle from the frame. As an additional time consuming issue, your clutch is probably full of asbestos. Bottom line: on top of the sheer cost of refurbishing the gearbox, you should factor for an additional 10~20hrs for the swap. Unfortunately this will probably not be "sufficiently expensive" for your mechanic who is going to be stuck with your car for quite a long period (waiting for the gearbox). Not an easy bargaining.

    Back to your original question (refurbishing the gearbox): ask your mechanic for a transmission specialist & machinist(s) he would be willing to work with. If your mechanic does not want to open his address-book this overhaul will be a huge and lengthy challenge.
     
    dedo tanzi likes this.
  9. dedo tanzi

    dedo tanzi Karting

    Dec 16, 2013
    51
    Lugano - SUISSE
    Full Name:
    DEDO - Alfredo
    Gazie.....felice giornata...
     

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