In case of critical malfunctions of the internal combustion engine, it is required to replace it. The engine is replaced in the following order: remove the engine protection, remove the hood, drain the coolant and engine oil from the engine, remove the radiator, thermostat and pipes, dismantle the carburetor, dismantle the ignition system, dismantle the receiver pipe, dismantle the collector, remove the cylinder head, disconnect power unit and gearbox, dismantle the main part of the engine. In injection engines, instead of the carburetor, it is required to remove the fuel rail with injectors, the injectors and the engine compartment wiring.