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Thread: Gearbox Input Shaft / Coupler Wanted

  1. #1
    Senior Member
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    Gearbox Input Shaft / Coupler Wanted

    Hi all

    I am on the lookout for a primary shaft. Hoping somebody that has fitted a one piece shaft and has one of these lying in the back of the shed

    Many thanks

  2. #2
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    Here is a video of the play in the shaft


  3. #3
    LS1 DMC Nicholas R's Avatar
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    What gearbox is that? Curious why it's got a speedo gear on it.

    Have you disassembled the gearbox yet and inspected the shaft? I'd almost bet money that your problem is not the main shaft but actually the inside of the coupler.

    Both the clutch and main shaft are case hardened, whereas the coupler is not. The coupler is ~20HRC (not heat treated or hardened) compared the shafts which are 45-55HRC (depending on where you measure). It's a fairly basic principle that when two parts rub, the harder part machines the softer part. The most likely situation is that the splines inside your coupler are worn away by the splines of the main shaft, and the rocking you're seeing is pivoting about the spring pin in the coupler and main shaft.

  4. #4
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    I think it was used in a Renault 25 at one point in its life

    The gearbox has not been disassembled. That makes sense what you are saying

    Ed agrees with you too - sent me this link https://www.simon-auto-shop.de/epage...roducts/091313

    I think that might be the way to go, thanks for the input

    Quote Originally Posted by Nicholas R View Post
    What gearbox is that? Curious why it's got a speedo gear on it.

    Have you disassembled the gearbox yet and inspected the shaft? I'd almost bet money that your problem is not the main shaft but actually the inside of the coupler.

    Both the clutch and main shaft are case hardened, whereas the coupler is not. The coupler is ~20HRC (not heat treated or hardened) compared the shafts which are 45-55HRC (depending on where you measure). It's a fairly basic principle that when two parts rub, the harder part machines the softer part. The most likely situation is that the splines inside your coupler are worn away by the splines of the main shaft, and the rocking you're seeing is pivoting about the spring pin in the coupler and main shaft.

  5. #5
    Senior Member
    Join Date:  Jun 2011

    Location:  Belfast

    Posts:    154

    My VIN:    4087

    Club(s):   (DOC-UK)

    Quote Originally Posted by Nicholas R View Post
    What gearbox is that? Curious why it's got a speedo gear on it.

    Have you disassembled the gearbox yet and inspected the shaft? I'd almost bet money that your problem is not the main shaft but actually the inside of the coupler.

    Both the clutch and main shaft are case hardened, whereas the coupler is not. The coupler is ~20HRC (not heat treated or hardened) compared the shafts which are 45-55HRC (depending on where you measure). It's a fairly basic principle that when two parts rub, the harder part machines the softer part. The most likely situation is that the splines inside your coupler are worn away by the splines of the main shaft, and the rocking you're seeing is pivoting about the spring pin in the coupler and main shaft.
    Managed to get the case split - Your youtube videos were very helpful, thankyou

    I found that the roll pin appears to have fractured (maybe due to movement in the coupler?) and its remains created the wound in the clutch tube.

    Looks like my primary shaft splines are ok, so will replace that coupler - maybe the roll pin can be reused?

    rollpin.jpg

    rollpin2.jpg

    splines1.jpg

    coupler1.jpg

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