Gege Blog 17.1 Disassembly of Gearbox F (f) .pdf



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Gege Blog English –

17.1 – DISASSEMBLY of GEARBOX "F" - Démontage de la boîte "F"
January 29, 2016
In May 2012, we went to Plombières at José Franssen’s ( Parts dealer ) . André had bought a new crankshaft and camshaft
there, and a gearbox (you never know ...). So this is the "F" for “Franssen” box ... The "A" is the original one of the car, which
we will keep , and the "B" is completely disassembled and comes from the marinized "B" engine )
At first glance the box "F" suffered from humidity, but I dismantle it anyway, it will help us to visualize the mounting of the
brake on transmission (disassembled and loose in boxes on the "A"), and observe the pinion adjustment shims (absent except one - on box "A"). I will then make an inventory of the parts to be found in the different cases to finalize the box "A" ...

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Rust has gone through there: and here we can guess the disastrous state of the train of intermediate gears ...

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February 4, 2016
This box has obviously already been dismantled, and as usual "careful" mechanics have used a chisel and hammer to undo the
drum nut on transmission ... This will save us from investing into a 32 mm pipe wrench!

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The puller :

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. The drum is seriously streaked ...

A screw of unknown origin wandered in the drum:

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Everything is super greasy, the oil-thrower ring has not (never?) fulfilled its role ...: . Position of the shims under brake shoes:
and it's off ..

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The rear plate of the drum is maintained by three nuts with washers:

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The two forks shafts:

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and the intermediate gears shaft. These nuts removed; the flange is removed without difficulty:

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Removal of the flange of the rear bearing held by three nuts:, and we discover the rear oil return turbine, with its adjustment
washers ("crushing washers"?):

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A bit of industrial vacuum cleaner to see a little more clearly before continuing:

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Essentials and multiple annotated bags to do a correct job:

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The forks have undergone a strange abrasion (which seems to be recent), however the cover with the shift lever was in place
...

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Friday February 5, 2016

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Continuation of operations tonight: removal of the pedals shaft ...
Unscrewing the key from the clutch pedal:

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Removing the small rod holding the bush retaining the pedal shaft

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:
… finishing with a nail ...

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and we put the rod back on the bush so as not to lose it

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:

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The clutch yoke: , removing the key from the fork: , and we can push the shaft towards the pedals side because the brake
pedal is locked on the shaft by rust: . It undergoes a bath of WD40 while waiting for her "extraction" ...

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Removing the key from the brake lever on the transmission:

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and removing the lever.

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Saturday February 6, 2016
Extract the transmission brake shaft

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Removing the leaf springs and balls from the forks, and drive out the pins (forward, i.e. towards the clutch housing, they come
out more easily in this direction ...) protecting the 7x100 threads with a nut. The rusty forks on their shaft are not helping !

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but it finally comes out

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:, and we store…

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Removing the rear bearing flange held by 3 nuts:

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One of the nuts only has the name of it; impossible to put a spanner on it! Welcome grip pliers ...

The bearing is long dead ...

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Two studs came out:,

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and the massacred nut seems to have been welded on one of them!

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To be continued tomorrow: remove the bearings from the primary shaft with their cages ...

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Sunday February 7, 2016
Almost the last straight line with the disassembly of this box ... for sport (and also discover the adjustment washers of the
intermediate gear train ...).
Disassembly of the primary shaft bearing cages. I apply the method that had worked well with the box "A", heat the aluminum
casing with a heat gun. The aluminum having a coefficient of thermal expansion almost double that of steel, this helps ...

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and the rear bearing cage comes out slowly, helped by a few blows of mallet ...

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Rear half of the primary shaft removed, we can recover the gears of 1st and reverse, and 2nd and direct drive:

The bearing then comes out, with its cage, under a simple blow of a mallet:

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Same thing on the front half of the primary shaft, always using the same technique:

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It is then necessary to unscrew the oil-thrower ring nut which is screwed to the left, this I learned on June 12, 2012 during the
disassembly of box "A"!

.

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But here this nut for oil-thrower ring has a stop ring (unlike box "A"), so you have to take it out before getting angry (and
therefore remember to have the patience to clean the parts rather than be in a hurry) ... and then it comes out very easily with
plumber’s pliers , and rags to protect the turbine nut:

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The entire primary shaft, to be packed, but it is ... very sick!

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Removing then the shaft of the intermediate gears train, which only comes forward (so to the clutch cover, I sometimes forget
that it is a rear wheel drive!)

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.

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:

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We must therefore protect the thread of the shaft with a nut, patiently heat the aluminum housing front and back, and it
comes out without much resistance ...

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Finishing with a rod

And it is out .

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Last job, take out the shaft of the reverse gear.

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Heating for very long time with the heat gun, but it resists!

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And that's where we realize that the Citroën engineers of 1922 had already discovered planned obsolescence: there is no way
to hit the shaft "in the axis" to get it out ; to believe that they never imagined that crackers like us would like to dismantle a
5HP box (having taken a long bath ) after more than 90 years ... No problem, it's just for sport and the pinion is anyway
perfectly dead:

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5

But there is no longitudinal play, so there must be an adjustment washer somewhere, I will persevere later.

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Small views of the train intermediate gears, just as unrecoverable, but I discovered "THE" adjusting washer

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… for the longitudinal play on the clutch side; it will be useful for reassembling box "A": .

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Sad condition:

A bronze bush on the back for the intermediate shaft. As the latter is fixed (not rotating), it only serves as a support for the
gear train ...

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and at the front there is nothing, the steel washer is running directly against the aluminum!

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THE END

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