For clarity, the work is shown on the removed carburetor.
Removing
1. Having shifted with a slotted screwdriver, remove the lock washer and then the pneumatic drive rod from the axis of the throttle lever.
2. Using a Phillips screwdriver, unscrew the two screws securing the pneumatic actuator to the carburetor body.
3. Disconnect the pneumatic actuator from the housing. A sealing gasket is installed between the carburetor body and the pneumatic actuator. Check the condition of the gasket and replace it if necessary.
4. To check the diaphragm, we sink its stem and close the vacuum supply hole with your finger. If the stem is not pushed back by the return spring, the diaphragm is good. Otherwise, the diaphragm must be replaced.
5. To replace a faulty diaphragm with a slotted screwdriver, unscrew the three screws securing the pneumatic drive cover.
6. Having separated the cover and the body, we take out the diaphragm and the return spring. Make sure that the O-ring A of the connecting channel is not lost. Replace the diaphragm with a new one.
Installation
1. Before assembly, we wash the metal parts of the pneumatic actuator with acetone or carburetor cleaner, and blow through the connecting channel.
2. We assemble and install the pneumatic drive in the reverse order.
3. If the diaphragm was replaced, before installing the rod end on the axis of the damper lever, we adjust the length of the rod. To do this, holding the key on 7 mm diaphragm rod from turning, loosen the lock nut with a wrench of the same size. By rotating the rod in the diaphragm rod, we achieve such a position that the hole of the rod tip coincides with the axis on the damper lever.
4. We put the rod on the axle and lock it with a washer.
5. Tighten the thrust locknut.