Carburettor Spare Parts for Dellorto, Weber, Solex, Zenith, SU, Pierburg, Mikuni
Zenith NDIX - How to swap the pump seal
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The seal is the pink-ish part in the photograph here on the right.
This seal is made of leather, pressed into shape.
Should you find a seal of a different material on your piston, that would indicate that the seal has been replaced at least once before.
Because the seal is made of a natural material (leather) its effective life span is limited.
Aggressive modern fuel do the rest and before you know, the ancient seal is worn and crumbles to parts.
Time to swap the seal as it is vital to the perfect operation of the carburetor.
Every time you depress the throttle pedal the piston injects a small amount of fuel in the air stream which prevents the engine from "drowning in air".
When the seal no longer properly seals, the engine will lack this small amount of fuel and becomes almost undriveable.
If you want to go the easy way, you could replace the complete piston with seal.
You can find those HERE.
But, of course, there's a price tag attached to it...
The lower-cost option is to replace just the seals.
For this purpose you can purchase the individual seals HERE.
Replacing the seals is not an easy job but it can be done by the home mechanic.
On this page, we will explain how to swap them.
Once you have acquired the seals, it's time to get to work.
Please read all of the following carefully to familiarize yourself with the procedure.
Also, you will need the following "tools" apart from a regular set of tools:
- Ball joint separator like in the picture to the left
- Sturdy washer like in the pictures below
To start, take the old piston and place it, upside-down, in a sturdy vice.
Cut away as much of the old seal as possible.
This will reveal the brass bottom end with a narrow "waist" in the middle, indicated by the arrow in the photograph.
Now trial fit the washer onto the waist of the brass cover.
It should be a snug fit, able to handle considerable force.
We will now use the washer to lift the brass cap off the piston shaft.
Place the steering joint fork under the washer.
Place the shaft of a hammer so that it supports the steering joint fork and acts as a pivot point.
When successful, the cap will now be separated from the shaft.
In this picture, the cap is shown upside-down, clearly revealing the splines that are both on the outside of the shaft and on the inside of the cap.
The splines ascertain a tight fit and prevent the cap from rotating an coming loose on the shaft.
Also visible in this photo is the remainder of the old leather seal which can now easily be removed.
Now place the cap back onto the shaft, making sure that the splines line up nicely and don't get damaged.
Gently tap the cap home. The sounds of the tapping changes when it is seated properly.
And congratulations!
You have just refurbished a Zenith NDIX pump piston and it should be good for many years of service!
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