[ROVERNET - UK] Gearbox changes

[Fritz Rauschenberg]

Thanks to all for the gearbox responses-it has been enlightening. Another
question-should I look to replace the current bushing box with a bearing
box keeping in mind that the bushing box needs synchro rings ? I have
located a bearing box at a reasonable price. 

Cheers,

Fritz


> [Original Message]
> From: Vern Klukas <vern at inkspotco.com>
> To: <rovernet at lyris.ccdata.com>
> Date: 8/28/2006 2:42:04 PM
> Subject: Re: [ROVERNET - UK] Gearbox changes
>
> Needle roller gearbox have a suffix of "H" or higher. The actual 
> serial number does not matter.
>
> As for the bushing failure, the only bushing failures I have ever 
> seen have been directly related to the early design bushing, which 
> was replaced fairly early in production. In my experience, the most 
> common form of total failure is wear and breakdown of the forward 
> layshaft bearing, a malaise common to both bushing and needle roller 
> gearboxes.
>
> Yours
> Vern
>
>
>
> >Fritz,
> >A 401******** is a bushing box.
> >The main gears have a larger inner diameter to match
> >the phosphor bronze bushes (X2).
> >
> >The 415******* series uses main gears with a smaller
> >inner diameter to match the roller bearings.
> >
> >The reverse gear is the same.
> >
> >The idler gear can be used.  In one case there is a
> >castle nut at one end and in the other case a bolt is
> >used.
> >
> >The 415 was introduced as the phosphor bronze bush got
> >crunched under some conditions.
> >
> >8 hours re and re plus gearbox time to just replace
> >the bush(es).  Major bummer!
> >
> >
> >Eric
> >
> >
> >
> >--- Fritz Rauschenberg <wfritz at mindspring.com> wrote:
> >
> >>  Regarding gearboxes, My 69 2000TC has a four speed
> >>  box that begins with
> >>  401.... and has a "G" suffix. So what do I have? The
> >>  bushing type or the
> >>  needle -roller-bearing type. It needs work (prob.
> >>  synchro rings on 1-2-3)
> >>  but I don't want to spend money on a "bushing box".
> >>  Any ideas as to what I
> >>  have ?
> >>
> >>  Fritz Rauschenberg
> >>  Atlanta
> >>
> >>
> >>
> >>  > [Original Message]
> >>  > From: Gordon Harrower <griffo at comcast.net>
> >>  > To: <rovernet at lyris.ccdata.com>
> >>  > Date: 8/27/2006 1:14:18 AM
> >>  > Subject: Re: [ROVERNET - UK] Gearbox changes
> >>  >
> >>  > Vern Klukas wrote:
> >>  >
> >>  > >> My gearbox saga continues, and I'd like to
> >>  consult the more
> >>  > >> knowledgeable.  I'm prepared to rebuild the
> >>  gearbox on my 1968 TC
> >>  > >> (gearbox suffix F), and have bought the
> >>  necessary parts from Pierre.
> >>  > >> Meanwhile, someone has offered me a functional
> >>  gearbox from a 1971
> >>  > >> TC.  Are there major differences or
> >>  improvements in the later 'box?
> >>  > >> Will it fit in my '68?  Gordon.
> >>  > >>
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> >>  > >
> >>  > >
> >>  > > Internally, your "F" gearbox is a bushing type,
> >>  while the 71 will be a
> >>  > > needle roller type. That means that the internal
> >>  mainshaft parts are
> >>  > > not interchangeable. The needle roller gearboxes
> >>  (suffix H and above)
> >>  > > are better but (technically) slightly nosier due
> >>  to the many more
> >>  > > rotating bits. The early bushing type gearbox
> >>  had problems with the
> >>  > > bush for 2nd and 3rd gear breaking, but unless
> >>  you came across a low
> >>  > > mileage original all of those have long since
> >>  broken and been fixed.
> >>  > >
> >>  > > Yours
> >>  > > Vern
> >>  > >
> >>  > Thanks, Vern.  I'll let you know how it goes.
> >>  Gordon.
> >>  >
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> >>
> >>
> >>
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> >
> >
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> >
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>
> -- 
> Vern Klukas                             I'm a little . . .
> Inkspot Type & Design
> vern at inkspotco.com
>
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