timing...

The 300D has a vacuum pump on the front of the engine, driven by an axial cam on the injector pump gear. A replacement costs ~$300. Most everything is vacuum operated, including the door locks. Kind of stupid since diesel don't have manifold vacuum, as C130 Chief knows. To shut-off the engine, vacuum is applied to the "stop valve" on the injection pump (similar to vacuum solenoids for climate doors on Darts. The key switch actuates both electric and a bolt-on vacuum switch for the stop valve. If you have a vacuum leak, the stop valve doesn't work, so there is a manual lever at the top of the pump labeled "stop". When the stop valve diaphragm fails, oil is sucked past into the vacuum system, which the driver realizes when oil starts dripping on the right foot from the key switch, and diesel oil is the blackest you ever saw. Exquisite German engineering. I plan to get rid of the 300D's in the future. I only have 2 because I bought one for its engine and ended up fixing it, then finding another engine for the first. They don't go a million miles. At 330K mi the pistons failed, which is typical for the turbo-diesels.