The 2CV suspension is a coil spring system mounted longitudinally beneath the floor on both sides of the car. The springs are contained in canisters, one spring for each wheel thus giving independent suspension. Tie rods connect the springs to the axle arms. The rods are connected to the axles by eyes which are screwed on to the tie rods which means that the length of the tie rods can be adjusted in order to give the correct ride height (see below).

The tie rod eyes connect to brackets on the axle arm with 'knife edges' which are pins, roughly triangular in shape, with clips at each end to prevent them sliding out of the bracket. The front and rear knife edges are different sizes. They must be kept liberally greased.

Apart from greasing the knife edges, there is very little maintenance needed on the suspension. If the springs are noisy within the canisters you can use vegetable oil or castor oil to lubricate them. This can be done by pulling off the conical rubber gaiter where the tie rod enters the suspension canister and, using an old oil can filled with vegetable oil, pumping the oil as far into the canister as possible. On no account use anything but vegetable or castor oil.

Since around 1970, 2CVs and Dyanes have been fitted with telescopic shock absorbers, back and front. The back ones are longer than the fronts. It is also important that they are fitted the correct way round as regards which end the cover is fitted. Some makes the cover end should be on the axle arm but other makes the cover end is fitted to the chassis. Strangely it does matter! So if you remove yours make sure you know which way they go back! When fitting new ones follow the manufacturer's instructions as they may be different to your existing ones.

The ride height is measured from the ground to a point on the chassis midway between the two bolts which secure the axle cross tubes to the chassis. On 2CVs and Dyanes from 1970 this should be 195mm at the front and 280mm at the back.To increase the ride height screw the tie rods further into the eye one or two turns at a time; to reduce the ride height unscrew the rod from the eye by one or two turns. There is a flat area on the tie rod on which a 9mm open ended spanner can be used to turn the rod; there is also a special tool available from the usual suppliers.The wheel on which the height is to be adjusted must be jacked up and you will have to lower the car to the ground after each adjustment to see if you've turned the rod far enough. Adjusting one wheel may affect the measurement on another wheel so be prepared to adjust all four. It is not uncommon for the eyes to be corroded onto the rods so if it won't turn easily give up or you may end up snapping the rod.
Technical pages
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