Bosch distributors are found on many cars and are generally very reliable. But after high mileage, you may find that the engine isn’t running quite as it should. If the rest of the fuel and ignition system is well-tuned, But the car doesn’t accelerate cleanly, the problem may lie in the distributor advance mechanism. Checking and freeing the mechanism is the only work you can do on the Bosch distributor as spare parts are not available. If there is wear in the distributor shaft bearings, a new unit is the only solution. The design is conventional with the contact breaker points mounted on a movable plate, Which in turn sits on a fixed baseplate. The vacuum advance unit is attached … Continue reading Overhauling a Bosch distributor