Engine Overview and Common Failures
The weight of the D4BH engine according to the catalog is 226.8 kg. The engine number for the D4BH is located at the junction with the cylinder head. Fuel system: Despite the fact that the engine is equipped with a reliable Bosch VE distributor type fuel pump, the most common problems with such diesel engines are related to fuel system failures. Due to the use of low-quality fuel, the mechanical parts of the fuel pump wear out and the engine has difficulty starting when hot. For the same reason, the fuel injector nozzles need to be replaced. Low belt lifespan: The timing belt should be replaced every 90,000 km as per the maintenance schedule, but often it breaks much earlier. This is because the belt needs to be tightened every 30,000 km, but many people ignore the manual. The balancer shaft belt also often breaks and gets sucked into the timing belt, which also breaks. Fortunately, in most cases only the rocker arm is damaged. Cylinder head cracks: Engines of this series do not tolerate overheating and the head gasket often fails, requiring resurfacing of the mating surfaces. In severe cases, cracks appear between the valves and around the pre-chambers. Therefore, cylinder heads for such engines are scarce and expensive. Other flaws: The remaining breakdowns can be listed in a single list: constant oil leakage from seals, frequent shearing of the crankshaft woodruff key, which immediately stops the drive of auxiliary equipment, and in very long drives at low RPM, the crankshaft can simply break. And don't forget about the periodic valve clearance adjustment, otherwise they will burn out.