Gege Blog 14.1 Disassembly of Gearbox A (f) .pdf



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1

Gege Blog English –

14.1 – DISASSEMBLY of GEARBOX "A" - Démontage de la boîte "A"

Saturday June 9, 2012
The essential parts of engine "A" being (almost) ready to go to Italy at Michel for a major repair, I attack today the gearbox
which seems to be original to the car. I am improvising as the documentation is too sparse, incomplete, diverse ... I don't
have the courage to read it, I will try to understand all of this by myself as a grown-up! … and André will still blame me
because I did this without him ....

The clutch housing starts badly, one nut is missing and the other two are loose ....

...
Everything is pretty rusty ...

The Citroën engineers of 1924 were machiavellian enough to imagine leaf springs to hold the balls of the forks !!!

2

The output bearing is dead of course.

A lever which I ignore the use of, but we will eventually understand

3

That little thing is unreasonably complex

Since I still want to put it back together after a big wash, I classify all the pieces carefully

4

I remove the studs to be able to put the casing vertically, easier to work. Obviously, they all come out except one
(the long one

But it is clear that this box does not know me well, what does she believe ? Steel studs screwed into aluminium : we take
out the heat gun to heat the casing and the plumber's pliers to loosen the stud, it does not resist long (thank you Christian
for helping out, sometimes you would need 4 of them )

5
What is this thing made for? In addition the screw does not seem to be original to me, I dismantle everything

Moving to the forks springs. Obviously, the screws were massacred by "professional mechanics", I take out my impact
screwdriver, nothing can resist it either ; thanks to him , I was able to dismantle the hinges of the “ Tracab “ ( Traction
Avant Cabriolet ) in ... 1990 (It does not make us younger !)

I love it, it's really useful

6
Springs !!

The forks are obviously blocked, I manage with great amount of WD40 to take out the ball of the top, and to find it under
the “Tracab “ when it jumped ... of course! The fork slides now

7
This box has really decided to annoy me ..., the other ball is totally stuck with rust. However, I thought I had made her
understand that I would have her, she must be deaf at 88 years old. WD40, heat gun, it came out before everything melted

Secondary shaft (I think) once again massacred, no more pins but a pseudo matting of the nut, I block two speeds and I
come to grips with it (yes, I know, I'm in bad shape today) don't look for me ...)

8

The flange of the primary shaft is missing a nut, the other two are not tight and in addition there is a 12 and a 13, but what
the hell were they B….. doing, in garages at the time? I manage to recover the seal, in order to be able to make a new one

9

10
This is where my camera decided to go to sleep, that's good, I'm going to eat and I will continue my sadistic actions on this
box later ...
A nice big sole meunière, cooked in butter very gently

… fries (of course), parsley, lemon, delicious

Sunday June 10, 2012
No courage to work last night, too busy watching the studio shots of "Sympathy for the devil" by the Stones
there .
I resume today ...

here and

So I dismantle this bizarre shaft, you have to orient it well to take out the nut
The shape of the key is conical; fortunately, it is not too tight because there is little room to hit it from outside

11

12
The shaft of the transmission braking system: which goes out it goes out without too much problem (but I hit hard!)

13

It emerges very slowly...

I can now drive out the shafts of the forks, first the left, leaving a 7x100 nut so as not to strike the thread then with a long
and thin screwdriver and it's out

14

There is a kind of stirrup that gets stuck , but it is stupidly straddling the axes, just know it (or find out)

15

I attack the shaft of the second fork.

which also comes out without too much difficulty, despite the oxidation;

16

I remove the fork

17
and put it back on its shaft to remember which way it is mounted

Here on the shaft to remember how it is fitted.

The gears slide correctly on the primary shaft, but I'm not at the end of my troubles to get it out!

18

I place the box vertically, it will be easier ...

19
The 3 studs out of the box (rear side) are annoying me, I remove them without much difficulty

I wonder how to take out the rear gear countershaft; well it comes out on the finger !!!

20

Strange ...

The gearbox rear outletis really well rusted

and the two bearings are in steel cages wedged in the housing. I tap on one side, on the other, I take out the heat gun, and
it starts to move

21

I try with the beautiful Facom tripod puller freshly acquired by André, but the bearing is really welded by rust on the shaft.

Finally, by tapping on the cage from behind I manage to extract it and take out the rear part of the shaft, Hurrah !

22

But it would be too easy, the primary shaft is in two fitted (clutched) parts,; we need to take out the clutch side

I can already take out two gears

23
The first gear

The second gear

Take out the second part of the primary shaft

I reference them as well as their positions

24

I tackle the second part of the primary shaft;, there too the bearing cage is securely blocked,

and the heat gun associated with the WD40 comes to my rescue

25
It's out!

Nothing comparable with a “traction AV ” box .!

.
I temporarily reassemble everything before rusting out the gears

26

And I can take the sprocket out of the secondary shaft which I also temporarily put back on its shaft

27

And here is the whole thing

28
It's over, all empty, all remains to be cleaned; , the two bearings to be removed and replaced (hoping they are standard),
and and reassemble all . The bronze bushes seem to me in good condition, that's a good thing !!!

And the small bags accumulate in the beautiful crates ...

Monday June 11, 2012

Little work tonight, trying to get out the two gearbox bearings ... I start by cleaning the rear shaft a bit, the cone is
seriously rusted

.

29

I then try with the Facom tripod puller, heating the inner cage, but nothing to do, and I am afraid of breaking the
puller

Without believing it very much, I hit a big blow with a plastic mallet on the axis, the bearing heated with a blowtorch, and it
came out!

Bearing 20x52x15, standard 6304 therefore, phew! It is completely dead, but we can replace it without difficulty ...

30
It remains to dismantle the clutch side of the shaft , but that resists, it is late and I will see that tomorrow ...

Tuesday June 12, 2012
André gave me a doc that I did not yet have about the disassembly of the box, and I discover that this is not how it comes
apart, the pinion being integral with the axis.
He also brought me his little boxes full of gears, forks, bearings, it can always be used ...

...
The gear nut is screwing to the left;, as soon as we know, it can be disassembled much more easily, !

31

I can easily take it apart by turning it in the right direction (clockwise) using pliers, protecting the teeth with a cloth

But the "professional mechanics" of the time must not have known that, seeing how it has been massacred

32
So massacred that I cannot, after having loosened it, slide it on the axis. So I take out my Dremel with a very small milling
cutter, in order to gently rectify its bore ... and I finally take it out

Just need to take out the bearing with its cage, without difficulty

33
We see here that a shaft (at the back on the photo) coming from the pieces brought by André presents a small hole for
pinning, that of the box "A" does not ..?????????

The essential tool

The front side bearing is, contrary to what we thought, different from the rear, it's a 25x52x15, so a 6205

34

As we do not have a replacement nut, I will try to repair the threads with my Facom file, it is 150

Good, it is recoverable, failing to find one in better condition.

Note: the shaft is not drilled to receive the pin intended to block the pinion nut (which is pierced), and on a shaft brought
by André, there is the hole. Strange.

35

I will thus attack, with a better knowledge , the box that André bought recently from Franssen

THE END

Gege Blog English –

14.1 – DISASSEMBLY of GEARBOX "A" - Démontage de la boîte "A"

Saturday June 9, 2012
The essential parts of engine "A" being (almost) ready to go to Italy at Michel for a major repair, I attack today the gearbox
which seems to be original to the car. I am improvising as the documentation is too sparse, incomplete, diverse ... I don't
have the courage to read it, I will try to understand all of this by myself as a grown-up! … and André will still blame me
because I did this without him ....

The clutch housing starts badly, one nut is missing and the other two are loose ....

36

...
Everything is pretty rusty ...

The Citroën engineers of 1924 were Machiavellian enough to imagine leaf springs to hold the balls of the forks !!!

The output bearing is dead of course.

37

A lever which I ignore the use of, but we will eventually understand

That little thing is unreasonably complex

38

Since I still want to put it back together after a big wash, I classify all the pieces carefully

I remove the studs to be able to put the casing vertically, easier to work. Obviously, they all come out except one
(the long one

39

But it is clear that this box does not know me well, what does it think? … Steel studs screwed into aluminium : we take out
the heat gun to heat the casing and the plumber's pliers to loosen the stud, it does not resist long (thank you Christian for
helping out, sometimes you would need 4 of them )

What is this thing made for? In addition the screw does not seem to be original to me, I dismantle everything

40

Moving to the forks springs. Obviously, the screws were massacred by "professional mechanics", I take out my impact
screwdriver, nothing can resist it either ; thanks to it, I was able to dismantle the hinges of the “ Tracab “ ( Traction Avant
Cabriolet ) in ... 1990 (It does not make us younger !)

I love it, it’s really useful

Springs!!

41

The forks are obviously stuck , I manage with great amount of WD40 to take out the ball of the top, and to find it under
the “Tracab “ when it jumped ... of course! The fork slides now

This box has really decided to annoy me ..., the other ball is totally stuck with rust. However, I thought I had made it
understand that I would have it,she must be deaf at 88 years old. WD40, heat gun, it came out before everything melted

42

Secondary shaft (I think) once again massacred, no more pins but a flattening of the nut, I block two speeds and I come
to grips with it (yes, I know, I'm in bad shape today) don't look for me ...)

43

The flange of the primary shaft is missing a nut, the other two are not tight and in addition there is a 12 and a 13, but what
the hell were they B….. doing, in garages at the time? I manage to recover the seal, in order to be able to make a new one

44

This is where my camera decided to go to sleep, that's good, I'm going to eat and I will continue my sadistic actions on this
box later ...
A nice big sole meunière, cooked in butter very gently

45

… fries (of course), parsley, lemon, delicious

Sunday June 10, 2012
No courage to work last night, too busy watching the studio shots of "Sympathy for the devil" by the Stones
there .
I resume today ...

here and

So I dismantle this bizarre shaft, you have to orient it well to take out the nut
The shape of the key is conical; fortunately, it is not too tight because there is little room to hit it from outside

46

47
The shaft of the transmission braking system: which goes out it goes out without too much problem (but I hit it hard!)

48

It emerges very slowly...

I can now drive out the shafts of the forks, first the left, leaving a 7x100 nut so as not to strike the thread then with a long
and thin screwdriver and it's out

49

There is a kind of stirrup that gets stuck , but it is stupidly straddling the axes, just know it (or find out)

50

I attack the shaft of the second fork.

which also comes out without too much difficulty, despite the oxidation;


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