15.5. REPLACING A CRANKSHAFT SEAL

It is not common that the retaining rings of a 2CV motor start leaking after quite some kilometres. This often starts with a small drop but will become ever worse. As mentioned before, this can be caused by a defect oil filler pipe. But still, when a retaining ring is leaking, this should always be changed.
- For the replacement of the front retaining ring, the ventilator and the rubber flap below the oil cooler will need to be removed. The motor can remain built-in here.
- Sometimes there’s also a metal plate behind the pipes of the oil coolers. This should be removed by folding this double and pulling it towards you through the space between the oil pipes.

If you also start replacing the rear retaining ring, the motor and gear box should be separated. Then remove the clutch and the flywheel so the retaining ring becomes visible.
- Carefully remove the retaining ring using a screwdriver or drill two small holes of 2 mm opposite each other in the middle of the retaining ring.
- Screw two parkers (those are self-tapping screws) in the holes and pull the retaining ring out of the motor.
- Grease the bore and the outside of the retaining ring.
- Orient the lip of the retaining ring towards the inside of the motor and the mark and number of the manufacturer outward.
- Tap the new retaining ring into the engine block using a plastic hammer.
- The installed retaining ring must fit 0.5 mm inside the engine housing surface.
- When replacing the rear retaining ring, please check the prise-axle retaining ring is still in good condition and replace if necessary.
- Mount the flywheel using the old tension bolts if these have not been damaged. No new tension bolts of good quality are available.

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