[Spits] help on gearbox disassembly

[Doug Braun]

I don't recall ever having any difficulty getting the rear extension housing off.

I hop you didn't take the instructions too literally, and try to remove the flange without removing the nut first.  :-)

Do you have to do anything relating to the speedometer drive?
I forget, but does the speedometer drive assembly have to come out first?

A piece of 2x4 is an excellent substitute for a leather mallet.


You definitely do have to remove the rear housing, so that the
main shaft and the counter shaft can come out.

Doug Braun
'72 Spit



--- On Mon, 12/15/08, Jim Muller <jimmuller at rcn.com> wrote:

> From: Jim Muller <jimmuller at rcn.com>
> Subject: [Spits] help on gearbox disassembly
> To: Spitfires at autox.team.net
> Date: Monday, December 15, 2008, 10:18 PM
> I know it's supposed to be the reverse of re-assembly,
> but I'm still 
> stuck on a few points.
> 
> GT6 3-rail gearbox, no OD.  I've got the top off,
> speedo drive 
> removed, rear flange removed from the output shaft.  The
> Haynes 
> manual which I'm trying to follow gives two
> instructions, one to 
> remove the nut on the flange and remove the flange, and
> another to 
> remove the flange.  I don't quite get what they're
> driving at; why 
> two instructions unless there' something about the
> first that I 
> missed.  It looks like there is a rubber seal and a bearing
> in the 
> extension housing.
> 
> Anyway, the next step is to pull the extension off the box
> "by 
> tapping underneath the mounting stud with a leather
> mallet."  Yeah, 
> right.  The picture shows someone casually pulling the
> extension from 
> over the shaft, but I'm not there yet.  I've
> managed to lift the 
> extension from the box by maybe 1/16th inch, just enough to
> break the 
> gasket seal so I have to finish the job.  But it looks like
> it is 
> being held in place by that bearing possibly pressed into
> the end.  
> Is the proper technique just to keep tapping so as to move
> a bearing 
> off the shaft?  Do I need to remove that seal first?
> 
> I'm starting to wonder why I'm doing all this.  The
> box sure looks 
> good inside to my casual inspection.  But now I'll have
> to re-seat 
> that gasket or else force enough Hylomar into the space to
> seal it.
> 
> So what's the magic incantation to pull that extension
> off?  Is it 
> just another pint of ale?  I suppose I should be using a
> Bentley 
> manual but it turns out mine is for the single-rail box in
> a 1500.  
> Don't know whether it would be different.
> 
> Thanks!
> 
> -- 
> Jim Muller
> jimmuller at rcn.com
> '80 Spitfire, '70 GT6+
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