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Gearbox issue

Discussion in 'S30 (240Z,260Z,280Z) Drivetrain' started by johnymd, Nov 22, 2016.

  1. toopy

    toopy
    Z Club Member

    Was going to start a new thread, but found this one which sounds similar to my problem.

    Im doing a S13 swap and have removed the bell housing, the three rods that the forks slide up and down on, appear to have moved!
    The lower one which i believe is reverse and fifth was sticking out further than the other two when the bell housing was removed,
    so i pushed it back a bit, minimal force, but it now seems to have gone too far, compared to the other two!!
    With the gear stick temporarily held in place, i can only select first and second, it wont move past neutral to the right, to select 3, 4, 5 or reverse, all gears were easily selectable before dismantling.

    I have read through the posts in this thread, but i have no experience with gearboxes and cant quite get my head round what is or isnt happening :(
     
  2. jonbills

    jonbills
    Z Club Committee
    Committee Member

    It's probably got more than 1 gear engaged - if you take the other half of the casing off you should be able to easily return it to a proper neutral
     
  3. johnymd

    johnymd
    Z Club Member

    I believe you should not have pushed the rod in :)

    My old 260z box only got stuck with 2 gears selected on 2 occasions. On both occasions the car was driven into the garage in 1st gear, clutch depressed and engine turned off. When next used the clutch was pressed in and the engine started then reverse was selected. When the clutch was released the car moved forward. On stripping the box I had to move the selector rods to get the back of the box off and then it was fine from then on.

    Take it apart and move the rods until they all line up and put it back together. Do not then touch the rods.
     
  4. toopy

    toopy
    Z Club Member

    If its just a case of moving the rods back into the correct position, can i not just gently pull/ease the offending rod back out, I dont fancy removing the back cover, as i really dont know what im doing, and now Im worried i'll just make it worse. Faffing about with the thing on a dusty garage floor is not ideal.

    This gearbox swap lark was supposed to be easy! :lol:
     
  5. SKiddell

    SKiddell Having a bad day

    It is if you know what you're doing

    You don't have to remove the back end to get the rods to their correct position
    There is a detent notch on the rod towards the sandwich plate, get a small pry bar and GENTLY lever it back to its correct position, avoid bringing any sharp edged tool into contact with the shaft and damaging it, when re installing the bell housing put the box into 3rd, this will lock the rods and prevent them moving so easily as if they were in neutral.
     
  6. Huw

    Huw
    Z Club Member
    Staff Member

    Sounds like you've got a selector engaging more than one gear. I don't know if the attached will help. It's my old gearbox with out casings. Should be in neutral if memory serves so you can see where the selectors need to be.
     

    Attached Files:

  7. toopy

    toopy
    Z Club Member

    The indent is currently inside the sandwich plate, i was going to try and use the reverse switch cutout as that has a flat face to lever/tap on towards the front.
     
  8. toopy

    toopy
    Z Club Member

    Thanks Huw
     
  9. uk66fastback

    uk66fastback
    Z Club Member

    I think gearboxes are a mystery to most people. Automatics especially. I count myself in that number.
     
  10. Rob Gaskin

    Rob Gaskin Membership Secretary Staff Member Committee Member

    Manual gearboxes are quite simple mechanical things really. Synchromesh makes them a bit more difficult to understand because I think most people think that when changing gear you are moving the gearwheels into mesh when in fact they are always in mesh but not locked to the shaft they are on. When people crunch the gears it's not the teeth on the gearwheels that are grinding but smaller ones associated with the synchromesh unit.
     
  11. toopy

    toopy
    Z Club Member

    So managed to gently pull out the offending selector rod, and can now easily get 3rd and 4th but, reverse and 5th although selectable, its stiff and notchy and you have to forcefully get back to neutral!
    The end of the rod also doesnt line up with the two above, sure it did previously!

    [​IMG]

    Also how do you remove the oil seal from the front cover plate, i have some picks/hooks but all that's happening is its getting chewed up and not budging, is there metal inside the outer part, as its bloody solid?
    [​IMG]
    [​IMG]
     

    Attached Files:

  12. jonbills

    jonbills
    Z Club Committee
    Committee Member

    The FSM shows removing the seal with a puller, but I think I drove mine out with a big socket. It is metal under the rubber.
     

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