1. Wipe the distributor cap inside and out. Replace the cap with cracks or signs of breakdown (very fine cracks), chips or badly worn contacts. The contact carbon should move freely inside the cover.
2. If the contact carbon has chips, cracks, is heavily worn, or the carbon spring is broken, it must be replaced.
3. Replace the runner with cracks, traces of burning, significant wear or corrosion of the outer contact.
4. The runner must fit tightly onto the roller. This is ensured by the leaf spring. A runner with a weakened or broken spring must be replaced.
5. Replace the coupling with severely worn studs.
6. The centrifugal governor weights must rotate freely on the axles.
Otherwise, the cause of the jamming must be eliminated.
7. Replace the roller if it is badly worn or scored.
The source is on the website [VazBook]
8. Inspect the bushings in which the shaft rotates on both sides of the distributor housing. If there are any scoring or significant wear on the bushings, replace the housing assembly with the bushings.
9. If the bushing is scored or significantly worn, replace the support plate.
10. To check the Hall sensor, assemble the circuit. The voltmeter should have a measurement limit of at least 15 V and an internal resistance of at least 100 kOhm. Slowly turn the distributor shaft. The voltmeter should show a sharp change in voltage from the minimum (no more than 0.4 V) to the maximum. The maximum voltage should not differ from the supply voltage by less than 3 V.