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Thread: Stumpy R380 transplant to SIIB F/C

  1. #1
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    Stumpy R380 transplant to SIIB F/C

    If you just need to swap out the primary pinion in an R380 box would that be a task to tackle without many special tools.

    I rebuilt my first series Landy box as a 14 year old in 1970, but am rather more timid with grey hair.
    Last edited by Lotz-A-Landies; 2nd February 2014 at 11:45 PM.

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    Quote Originally Posted by Lotz-A-Landies View Post
    Sorry for a slight hijack. But if you just need to swap out the primary pinion would that be a task to tackle without many special tools.

    I rebuilt my first series Landy box as a 14 year old in 1970, but am rather more timid with grey hair.
    They use Grey Silicone these days , grey hair is old hat , don't use it , it will leak !

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    Quote Originally Posted by chopper View Post
    They use Grey Silicone these days , grey hair is old hat , don't use it , it will leak !

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    Back to the question.

    Is changing over one primary pinion to a different primary pinion on an R380 a job that can be attended without special tools?

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    Hey Diana,

    I am assuming you mean what I would call the input shaft?

    If so, you need to almost totally strip the box to do it, so basically you need any tools you would need to do the rebuild. You can do it without the special LR tools but you will still need pullers etc etc

    Rgds
    Pete

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    Quote Originally Posted by Psimpson7 View Post
    Hey Diana,

    I am assuming you mean what I would call the input shaft?

    If so, you need to almost totally strip the box to do it, so basically you need any tools you would need to do the rebuild. You can do it without the special LR tools but you will still need pullers etc etc

    Rgds
    Pete
    Hi Pete

    Yes I mean the input shaft. Looking at the images on various rebuilds, AFAIK/can see, I don't need to dismantle the mainshaft or sandwich plate, just remove the mainshaft and layshaft still attached to the sandwich plate, then change over the input shaft/pinion. If I use a new bearing on the pinion hopefully all I'll need is new gaskets/sealant and to press out/press in the bearing in the front of the housing.

    At least it will give me an opportunity to inspect the condition of the box.

    Diana

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    Hi with all my CD manuals, it seems that I don't have a parts catalogue for the R380.

    Does anyone have the part number for the bearing on the input shaft/pinion? D1 V8 box.

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    Quote Originally Posted by Lotz-A-Landies View Post
    Hi with all my CD manuals, it seems that I don't have a parts catalogue for the R380.

    Does anyone have the part number for the bearing on the input shaft/pinion? D1 V8 box.
    I assume that the bearing you referred to is the one fitted on the shaft itself,

    Discovery I 1989-1998, Bearing Taper Roller -----------, Part number RTC6751 -------- note: Suffix J
    Discovery I 1989-1998, Bearing Taper Roller -----------, Part number TZZ100190 ------ note: Suffix K .

    Shaft primary manual transmission -------, Part Number FTC5044 -------- note: V8 Suffix J (from (V) MA 081992
    Shaft primary manual transmission -------, Part Number TUD102340 ------ note: V8 Suffix K

    Discovery II 1999-2003, Bearing Taper Roller 35.0 x 72.0, Part number TZZ100190

    Shaft primary manual transmission -------, Part Number TUD102340 ------ note: V8 Petrol.
    .

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    Thanks Arthur

    Yery complete answer but makes an issue for me. I'm changing the input pinion from the original to the Ashcroft short bellhousing kit I wonder if there are any differences?

    I can see some micrometer work coming up.

    Diana

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    Quote Originally Posted by Lotz-A-Landies View Post
    Thanks Arthur

    Yery complete answer but makes an issue for me. I'm changing the input pinion from the original to the Ashcroft short bellhousing kit I wonder if there are any differences? I can see some micrometer work coming up.
    Hi Diana

    Look at the diameter and pitch of the teeth on the primary shaft's gear.
    I'm not sure about this, but I believe that the primary shafts are not interchangeable between the J to K/L Suffix because of the difference in the pitch of the teeth on the upgraded Layshaft.

    I'm working at the present towards reconditioning a batch of R 380 gearboxes but still could be months away from learning about whether there are any differences.
    .

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