here's one for the technical boys, whats wrong with my gearbox

Thread in 'Technical Questions' started by thegosson, Feb 22, 2010.

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  1. thegosson

    thegosson matt black 180

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    at goldstone DI day out way mid drift "ish" and gave the clutch a bit of kick and n releasing it the car gave the mother of all bangs which left me rolling to a stop in the middle of the track. now i have no drive at all.:confused: heres a vid to show whats happening from inside the car when i change gears. all stationary by the way. engine and box are sr20det.

    YouTube- sr20det gearbox problem !!!!! HELP

    can anyone shine a bit of light as to whats going on??
     
    #1 thegosson, Feb 22, 2010
    Last edited: Feb 22, 2010
  2. Bolf

    Bolf Resident Nut Job.

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    vid no work
     
  3. thegosson

    thegosson matt black 180

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    oops there ya go
     
  4. jimmy crowley

    jimmy crowley Rouge Dori s15

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    i think its cos its low on petrol lol ah no thats fucked up id nearly say your main shaft is broke thats wat it looks like if thats possible
     
  5. gtst lad

    gtst lad Ut oh

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    i'd guess that some cogs have no teeth left and something else is broken as well.
    Definately new gearbox time if its a standard box or a rebuild if the box is/was abit more special
     
  6. thegosson

    thegosson matt black 180

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    is/was standard sr box
     
  7. MR-steveo

    MR-steveo TNS MAN CHILD

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    you have broken the end of the tail shaft of me recones if you have lost all gears!
     
  8. driftma

    driftma Member

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    I'd be saying your after managing to break your main shaft some place,
     
  9. doughnutter

    doughnutter Member

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    I kept breaking the 2 constant mesh gears on my boxs for the main and secondary shaft. Loud noise, followed by a total lack of gears and horrible noises. Usually after a 3rd gear clutch kick :D
     
  10. thegosson

    thegosson matt black 180

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    right so iv just been out investigating a bit more and what gem-s13 suggested was right. when i give it a bit more revs and try to see if i can get 2nd to grind(purely to see if its still there). it will grind so 2nd gear is still intact after all:D. got a look under the car and the prop shaft isn't moving so im guessing what danmoorhead said that the output shaft has broken/snapped.:eek:
    next question is, is this a part/shaft that can be just replaced or whats the story there? like is there loads of stuff attached or just pop it out and pop in another one???
     
    #10 thegosson, Feb 22, 2010
    Last edited: Feb 22, 2010
  11. Mr Bizzle

    Mr Bizzle In Safe Hands

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    The easiest way to sort this is to replace the entire box mate. You can use a CA18 one (if they are cheap in Irl) and swap the bell housing... Or simply get another SR one.

    Don't fuck about trying to repair the gearbox. They are made of cheese anyway. If you have broken one, it won't be the last.
     
  12. mitto

    mitto -NIGHTSPIRT FAMILY-

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    basically what bizzle said. replace the box. if you break them that way, it's a good indicator that you have slack from the back. check you diff backlash, shims and CV joints for play. CV joints are the main culprit, its backlash that causes the output to snap like that.
     
  13. Polo

    Polo Sr20 parts man!

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    yep sounds like your out put shaft is broken.

    You should upgrade to an RB25 box;)
     
  14. mitto

    mitto -NIGHTSPIRT FAMILY-

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    when you bother to make an R154 or V160 conversion, i'll be listening.
     
  15. FireStorm999

    FireStorm999 Active Member

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    ive replaced 3 boxes now. 2 broke because there was play around the back end of the gearbox (where it meets the propshaft) causing vibration and then bang bang bang, stripped main shaft.

    just replace the box.

    as bizzle said just get a CA box and replace bell housing (he told me that and its really saved me pennies). recently did one, only needed to replace front housing. however changed both, cleaned and blew out all the gears + my casing, used some decent GB oil. feels like new.

    dont tell to many people as CA boxes might go up in price!
     
  16. Mr Bizzle

    Mr Bizzle In Safe Hands

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    :nod:

    Do a T56 one and solve all problems. Large casing Nissan box is only a bit stronger than the small casing and a f**k load more expensive to repair.
     
    #16 Mr Bizzle, Feb 23, 2010
    Last edited: Feb 23, 2010
  17. mitto

    mitto -NIGHTSPIRT FAMILY-

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    finally we agree! haha.
     
  18. thegosson

    thegosson matt black 180

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    just to add a conclusion to this thread.
    i finally got a chance to put the car up on the lift and start stripping to see what happened the gearbox, and i found the problem. it is as i suspected, the output shaft has snapped in two.
    look at the state of it.........cant get the feckin thing out of the prop now, theres always something eh...

    [​IMG]
    [​IMG]

    and a goo at whats left of the shaft inside the box.
    [​IMG]
     
  19. MR-steveo

    MR-steveo TNS MAN CHILD

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    I win ;-)
     
  20. diamondsink

    diamondsink Kyouto Drift

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    A shaft from one of the nissan trucks are the same. Just cant remember which one.
     

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