Table of contents: Description of engines 🠇 Repair of the engine installed in…🠇
This subsection describes repair operations that can be performed on the engine installed in the vehicle. If repairs are performed on an engine that has already been removed, the removal operations can be ignored.
Description of engines
The XUD type engines are turbocharged, four-cylinder, transversely mounted overhead camshaft engines with the gearbox on the left side of the engine.
The aluminum alloy cylinder head has 8 valves on 1.9-liter engines and 12 valves on 2.1-liter engines. On 1.9-liter engines, valve clearances are adjusted by adjusting shims placed between the tappets and the ends of the valve stems; on 2.1-liter engines, valve clearances are adjusted automatically by hydraulic tappets.
The camshaft is mounted on three bearings directly in the cylinder head on 1.9-liter engines and on five bearings on separate mountings on 2.1-liter engines. A toothed belt drives the camshaft, high-pressure fuel pump and coolant pump.
The crankshaft rests on five main bearings. The axial clearance of the crankshaft is adjusted by thrust half rings located on both sides of bearing No.2.
The pistons are selected by weight and have floating piston pins secured with retaining rings.
The oil pump is driven by a chain from a sprocket located on the front of the crankshaft. An oil cooler is provided on all engines.
Warning! The 1.9 and 2.1 liter engines are complex units with numerous systems and auxiliary units. The engine compartment is used to the maximum and access to the engine and auxiliary units is extremely limited. In many cases, auxiliary units will have to be removed or moved, and electrical wiring, pipes and hoses will have to be disconnected and removed when repairing the engine.
Repair of the engine installed in the car
The following work can be performed on a 1.9 liter engine installed in a car:
- removing and installing the cylinder head;
- replacement of the timing belt;
- removal and installation of camshaft;
- removing and installing the oil pan;
- removal and installation of piston group;
- removing and installing the oil pump;
- engine mount replacement;
- removing and installing the flywheel.
The following work can be performed on a 2.1 liter engine installed in a car:
- replacement of the timing belt;
- removal and installation of camshaft and hydraulic tappets;
- removing and installing the oil pan;
- removing and installing the oil pump;
- engine mount replacement;
- removing and installing the flywheel.
Caution! On 2.1 liter engines, the distance between the cylinder head and the bulkhead at the rear of the engine is so limited that it is impossible to remove the cylinder head from the engine installed in the vehicle. This operation is only performed on the engine removed from the vehicle.