[ROVERNET - UK] SD1 Gearbox

[Nick and Laurie Hand]

Hi Kent,
Just a recap of how I got to this point. I bought the car in Oregon with a
bad transmission. I purchased a used transmission  from Rover shop in
Oregon. Prior to installing replaced front & rear seals, did a cursory
visual inspection, of what I could see. Transmission had a bearing noise
from the beginning. 7000 miles now and does not seem to be any worse; but I
don't want to drive it to destruction. The plan was to drive this engine and
transmission a couple of years and  rebuild the engine and transmission in
my parts car, to have a replacement on hand. I've driven parts car .
Transmission is quiet and behaves normally. If I could replace the front
bearing with out splitting the case I thought it might be worth while.  Nick
From: "Kent Kinard" <kkinard at wcc.net>
To: <rovernet at lyris.ccdata.com>
Sent: Wednesday, January 31, 2007 7:43 PM
Subject: Re: [ROVERNET - UK] SD1 Gearbox


> Hi Nick,
> I've never done it.  RPI developed this replacement many
> years ago, but I'm not sure they even supply the parts any
> more.  I think it requires spliting the case and removing
> the first motion gear and doing some machining to it in
> order to fit a roller bearing to the front end of the
> mainshaft.  I'v never really seen this done, only heard
> about it.
>
> If the LT77 is not damaged, simply replacing the bearings,
> shimming properly according to the shop manual, and
> changing the trans fluid often should be good for 80k
> miles.  Swarf is the enemy of these transmissions.  It
> eats up or jams the oil pump.  Also, even a few miles of
> towing with the rear wheels on the ground is enough to
> destroy the trans, so always disconnect the driveshaft or
> tow it like you would an automatic with the front wheel on
> the ground.
>
> I don't think it's a good idea to just swap in an unknown
> transmission without a teardown and inspection.
>
> Roverly,
> Kent K.
>
> On Wed, 31 Jan 2007 17:00:33 -0600
>   "Nick and Laurie Hand" <flynp170 at cablelynx.com> wrote:
> > My SD1 gearbox [5speed] has a bearing noise and I intend
> >to replace it with
> > one from my parts car. I read this on RPi engineering
> >web site "Having
> > supplied many reconditioned units in the past, we
> >developed a replacement
> > for this taper bearing, using a heavy duty non-tapered
> >one. This can be
> > fitted with very little fuss and ensures a more precise
> >allignment for many
> > many thousands of miles."   Anyone replaced the front
> >bearing with a non
> > taper one? Thanks Nick
> >
> >
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