Gearbox Splines R8/R16
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Thread: Gearbox Splines R8/R16

  1. #1
    Fellow Frogger! R8philSA's Avatar
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    Default Gearbox Splines R8/R16

    Hi Guys.

    Is there anybody out there that can put me straight?

    The Gearbox in my R8 'Barn Find' has 21 splines on the clutch input shaft. My other R8 has 20 splines on the clutch input shaft.

    So is this telling me that the gearbox fitted to the 'Barn Find' has probably been modified/upgraded with R16 gear ratios and stronger box ??

    Thanks to anybody that knows the answer

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    Cheers
    Phil

  2. #2
    Simon's Avatar
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    Nope. It could also mean someone has just swapped the input shaft to accept a 16 clutch plate.
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    Fellow Frogger! R8philSA's Avatar
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    OK, thanks Simon.
    Very wet up at Blackwood this morning but there was 5 Renaults there; Trophy, RS 265, 2 x Megane Sport and a Cleo Sport. Good collection of Labos, Mazzas and Ferrari as well.
    Thanks again
    Phil

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    1000+ Posts Frans's Avatar
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    Phil,

    That shaft differs on the clutch plate end and is specific for a TS clutch plate and differs for a R8/R10 but the other end that goes into the box is the same as R8/R10.

    The only way to tell if it is a Big Box without opening it, is if there is a spacer in on the side shaft output tubes.

    Regards, Frans
    Old enough to know better
    Young enough to do it anyway.

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    Fellow Frogger! R8philSA's Avatar
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    Thank you Frans.
    I just haven't got down to the G/Box yet so it is for a future discovery. Do you have to remove the drive shafts boots to see the spacers ?? Just started on the engine last week but to cold and wet at the moment to work outside!
    Cheers
    Phil


    Quote Originally Posted by Frans View Post
    Phil,

    That shaft differs on the clutch plate end and is specific for a TS clutch plate and differs for a R8/R10 but the other end that goes into the box is the same as R8/R10.

    The only way to tell if it is a Big Box without opening it, is if there is a spacer in on the side shaft output tubes.

    Regards, Frans

  6. #6
    1000+ Posts renault8&10's Avatar
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    The spacer if present (if it has an R16 diff) will be bolted between the gearbox casing and bearing carrier/axle tube on the drivers side of the gearbox. It will be around 5-6mm deep. You could also look for my recent thread on putting my gearbox together.

    The diff centre requires the gearbox and engine be bolted 5-6mm further towards the left hand side of the car by use of the spacer and other means, otherwise the drivers side would poke 5-6mm further out than the left.

    You can't see the spacer in my pic below, but you can see the bearing carrier beside the rubber boot. Keeping looking towards the gearbox casing. I thought I had a photo of it, but doesn't appear so.
    Attached Thumbnails Attached Thumbnails Gearbox Splines R8/R16-dscn2848.jpg  
    Last edited by renault8&10; 29th May 2017 at 10:43 PM.
    KB


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    Fellow Frogger! potentz's Avatar
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    Quote Originally Posted by renault8&10 View Post
    The spacer if present (if it has an R16 diff) will be bolted between the gearbox casing and bearing carrier/axle tube on the drivers side of the gearbox. It will be around 5-6mm deep. You could also look for my recent thread on putting my gearbox together.

    The diff centre requires the gearbox and engine be bolted 5-6mm further towards the left hand side of the car by use of the spacer and other means, otherwise the drivers side would poke 5-6mm further out than the left.

    You can't see the spacer in my pic below, but you can see the bearing carrier beside the rubber boot. Keeping looking towards the gearbox casing. I thought I had a photo of it, but doesn't appear so.
    Sorry for tne correction,KB. The spacer will be 11 to 12 mm thick and if if the engine and gearbox location is not shifted, the drivers side will protrude 11 to 12 mm more than the left.
    cheers brian

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    1000+ Posts renault8&10's Avatar
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    Happy to be corrected Potenz.
    I didn't go back and review my post, nor look at the gearbox. Was just going off memory.
    KB


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    Fellow Frogger! R8philSA's Avatar
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    Thanks KB and Brian. I,ll look tomorrow.
    Phil


    Quote Originally Posted by renault8&10 View Post
    Happy to be corrected Potenz.
    I didn't go back and review my post, nor look at the gearbox. Was just going off memory.

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    Fellow Frogger! R8 Dream's Avatar
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    Quote Originally Posted by R8philSA View Post
    Thank you Frans.
    I just haven't got down to the G/Box yet so it is for a future discovery. Do you have to remove the drive shafts boots to see the spacers ?? Just started on the engine last week but to cold and wet at the moment to work outside!
    Cheers
    Phil
    Phil, see attached photo which shows the ring between gbox and shaft tube (bottom side)
    Angelo

    Attachment 96649

  11. #11
    1000+ Posts renault8&10's Avatar
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    Angelo,

    That looks to be the earlier style bellhousing? Does it bolt up to your engine OK and the clutch work.
    KB


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    Fellow Frogger! R8 Dream's Avatar
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    Quote Originally Posted by renault8&10 View Post
    Angelo,

    That looks to be the earlier style bellhousing? Does it bolt up to your engine OK and the clutch work.
    Sorry if the pic caused any confusion, the pic was just to highlight the offset ring.

    The gbox is a 'R10 strong box' with R16 internals, with again bell-housing from a late R10 type to fit R5 Alpine engine, not R16TS as Phil is running.

  13. #13
    1000+ Posts Frans's Avatar
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    Quote Originally Posted by renault8&10 View Post
    Angelo,

    That looks to be the earlier style bellhousing? Does it bolt up to your engine OK and the clutch work.
    KB, if you enlarge the pic it looks like the sleeve for the thrust is visible? So the clutch should work.

    Angelo, we realise that but there were 2 styles. The old one with the carbon thrust fork and the new one with a roller thrust fork. Both fit on the Sierra block.

    Frans.
    Old enough to know better
    Young enough to do it anyway.

  14. #14
    Fellow Frogger! R8philSA's Avatar
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    Thanks Angelo

    I'll check it out tomorrow morning. Can't miss it really.

    Thanks mate
    Phil



    Quote Originally Posted by R8 Dream View Post
    Phil, see attached photo which shows the ring between gbox and shaft tube (bottom side)
    Angelo

    Attachment 96649

  15. #15
    Fellow Frogger! R8 Dream's Avatar
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    Quote Originally Posted by Frans View Post
    KB, if you enlarge the pic it looks like the sleeve for the thrust is visible? So the clutch should work.

    Angelo, we realise that but there were 2 styles. The old one with the carbon thrust fork and the new one with a roller thrust fork. Both fit on the Sierra block.

    Frans.
    Frans
    I have the roller type. See pic.
    Angelo

    Attachment 96656

  16. #16
    1000+ Posts renault8&10's Avatar
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    That's what Frans meant by the sleeve comment. That would determine that it used that type of thrust bearing.
    Anyhow, we wait for an update from Phil re the spacer ring.
    KB


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