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3.2. Diesel engines


This subsection describes repair operations which can be executed on the engine installed in the car. If repair of already removed engine is made, operations of dismounting can be ignored.

Description of engines

XUD engines are engines with a turbocompressor, with four cylinders, with the top arrangement of a cam-shaft installed cross with the transmission on the left side of the engine.

The head of the block of cylinders from aluminum alloy has 8 valves on engines 1.9 liters and 12 valves on engines 2.1 liters. On engines 1.9 liters valvate gaps are regulated by the adjusting laying placed between pushers and end faces of cores of valves, on engines 2.1 liters valvate gaps are regulated by automatically hydraulic pushers.

The cam-shaft is established on three bearings directly in a head of the block of cylinders on engines 1.9 liters and on five bearings on separate fasteners on engines 2.1 liters. The gear belt puts a cam-shaft, the fuel pump of high pressure and the pump of the cooling system in action.

The crankshaft leans on five radical bearings. The axial side play of the crankshaft is regulated by the persistent half rings located from two parties of the bearing No. 2.

Pistons are selected on weight and have the floating piston fingers fixed by lock rings.

The oil pump is put in action by a chain from the asterisk located on a forward part of the crankshaft. The oil heater is available on all engines.
Prevention

Liter engines 1.9 and 2.1 – difficult units with numerous systems and auxiliary units. The motor compartment of the engine is used as much as possible and access to the engine and auxiliary units is extremely limited. In many cases auxiliary units should be removed or moved, and the electrical wiring, tubes and hoses should be separated and removed at repair of the engine.

Repair of the engine installed in the car

On the engine 1.9 liters installed in the car it is possible to perform the following works:

 – removal and installation of a head of the block of cylinders;
 – replacement of a gear belt;
 – removal and installation of a cam-shaft;
 – removal and installation of the oil pallet;
 – removal and installation of piston group;
 – removal and installation of the oil pump;
 – replacement of an engine mount;
 – removal and installation of a flywheel.

On the engine 2.1 liters installed in the car it is possible to perform the following works:

 – replacement of a gear belt;
 – removal and installation of a cam-shaft and hydraulic pushers;
 – removal and installation of the oil pallet;
 – removal and installation of the oil pump;
 – replacement of an engine mount;
 – removal and installation of a flywheel.
Prevention

On engines 2.1 liters the distance between a head of the block of cylinders and a partition of a motor compartment from the back party of the engine is so limited that it is impossible to remove a head of the block of cylinders from the engine installed in the car. This operation is made only on the engine removed from the car.