Oh, I see! That makes sense!
Apologies to everyone on the list for providing blatently incorrect
information - I hope I haven't confused anyone too much!
Dean
-----------------
>----------
>From: Bill Davies[SMTP:daviesw@ecid.cig.mot.com]
>Sent: 29 June 1999 13:00
>To: Dean Dashwood
>Subject: Re: Gearbox interchangability
>
>Hi Dean,
> The single rail gearbox is a direct development from the 3-rail - there
>is a very close family resemblance. While the oil is shared between the
>box and Overdrive, there are separate drain plugs to each section (but a
>common filler). Oil can flow freely through the bearings into the
>overdrive. Once the level in the box becomes low, there is no flow of
>oil between box and overdrive, which is why a non-functioning overdrive
>is the first sign of a low oil level in the 'box.
> Hope this clears things up a bit,
> Cheers,
> Bill.
>
>Dean Dashwood wrote:
>>
>> Bill,
>>
>> I've never had a look at a 3 rail gearbox, only the single rail on my
>> '77 1500. I can't say I looked at that in too much detail, to tell the
>> truth, but I'm sure they share oil - how would they do that, without
>> having a channel drilled in the case?
>>
>> How does the 3 rail gearbox do it? I always thought that this also
>> shared its oil with the overdrive, but this was really just an
>> assumption since I've never seen one, so I could well be wrong on this
>> one.
>>
>> Just curious.
>>
>> Dean
>> -----------------
>>
>> >----------
>> >From: Bill Davies[SMTP:daviesw@ecid.cig.mot.com]
>> >Sent: 29 June 1999 11:04
>> >To: Dean Dashwood
>> >Cc: 'spitfires@autox.team.net'; 'Mark Gardner'
>> >Subject: Re: Gearbox interchangability
>> >
>> >> No, you can't just bolt an overdrive onto the back of a non-o/d gearbox.
>> >> For one thing, they share gearbox oil, so the gearbox casing is
>> >> different to allow oil to flow between the two units.
>> >
>> >I'm sure this is wrong. I have previously rebuilt 3 rail Spitfire boxes
>> >from non-O/D to O/D, and I am currently doing the groundwork to convert
>> >a single rail 1500 box to O/D using components from a Dolomite 1850 box.
>> >There is certainly no noticeable difference, and I did not see a
>> >different part number shown for the casing (this is the Factory Parts
>> >List).
>> >
>> >> One of the big suppliers in the UK (maybe John Kipping, but I can't
>> >> remember for sure) supplies everything you need as a kit, including a
>> >> rebuilt gearbox. I think it costs around 400 UKP. I don't know how
>> >> practical it is to modify an existing gearbox to work with o/d, but
>> >> since the cost of a reconditioned gearbox is so low, I'd guess it's
>> >> probably not worth it.
>> >
>> >The Overdrive Conversion kits which John Kipping sells are in short
>> >supply, some 6-cylinder kits were recently being quoted on a 2 year
>> >waiting list. This may not apply to the 4 cylinder boxes, but I'd check
>> >with John first, rather than assuming they are available off the shelf.
>> > Cheers,
>> > Bill.
>> >--
>> >---------------------------------------------------------
>> > This Message sent by:
>> > ^================^
>> > / \ William Davies
>> > / \ Total Triumph Enthusiast
>> > __ __________________ __
>> >/ \ ______ ______ / \ 1959 Herald 948 Coupé Y128
>> >\__/ \ || / \__/ 1959 Herald 948 Coupé
>> >| A \____||____/ A | 1959 Herald 948 Saloon
>> >| = H H = | 1960 Herald 948 Saloon Export
>> >=====U==============U===== 1961 Herald 'S'
>> >\________________________/ 1964 Herald 1200 Saloon
>> > | | | | 1973 Spitfire MkIV
>> > |_| |_| 1959 Standard Atlas Pickup
>> >
>
>--
>---------------------------------------------------------
> This Message sent by:
> ^================^
> / \ William Davies
> / \ Total Triumph Enthusiast
> __ __________________ __
>/ \ ______ ______ / \ 1959 Herald 948 Coupé Y128
>\__/ \ || / \__/ 1959 Herald 948 Coupé
>| A \____||____/ A | 1959 Herald 948 Saloon
>| = H H = | 1960 Herald 948 Saloon Export
>=====U==============U===== 1961 Herald 'S'
>\________________________/ 1964 Herald 1200 Saloon
> | | | | 1973 Spitfire MkIV
> |_| |_| 1959 Standard Atlas Pickup
>
|