Engine Overview and Common Failures
The weight of the D4BB engine according to the catalog is 200.8 kg. The engine number D4BB is located at the junction with the cylinder head. Despite being equipped with a simple distributor-type pump, on long journeys, the engine often has difficulty starting when hot due to severe wear and tear on the injection pump. The gaps in the plunger increase due to heating, and the necessary pressure simply cannot be created. Over time, the injectors also begin to overflow and their nozzles need to be replaced. Low lifespan of timing belts. According to the regulations, the timing belt should be replaced every 90,000 km, but in reality, it can break much earlier, especially if its tightening is ignored every 30,000 km. The balance shaft block has a separate belt that often gets caught in the timing belt when it breaks, causing it to snap as well. It's fortunate that only the rockers break in this case. Cracks in the cylinder head. This power unit is prone to overheating and the gasket often blows out. In this case, replacing the gasket is not enough; the mating surfaces will have to be ground. Cracks frequently form in the cylinder head, especially around the pre-chambers or between the valves, which is why cylinder heads for these diesel engines are very scarce and expensive. Other shortcomings. Regular complaints on the specialized forum include lubrication leaks through gaskets and seals, low lifespan of the vacuum pump, and crankshaft damage at low speeds. The woodruff key on the crankshaft is often sheared off, resulting in the loss of drive for auxiliary equipment. And don't forget to check the valve clearance every 20,000 km, or they will simply burn out.