Recommendation. The condition of the engine should be monitored regularly during the operation of the vehicle. Signs of malfunctions may be: the presence of oil drops in the parking lot of the car; ignition of the engine malfunction warning lamp or emergency oil pressure warning lamp, the appearance of an extraneous sound (noise, knock) during engine operation; smoky exhaust; moving the arrow of the temperature indicator to the red zone; increased oil consumption, noticeable loss of power. If at least one of the listed signs is detected, a more detailed check is necessary. Checks of the technical condition of engine systems are shown in the relevant sections of the chapter «Engine and its systems» (see «Checking the technical condition of the cooling system»; cm. «Power system - check of technical condition»; cm. «Checking the technical condition of the engine management system»; cm. «Check of a technical condition of system of release of the fulfilled gases»).
It is possible to assess the technical condition of the engine with sufficient accuracy by external signs and with the help of available equipment (compression gauge, manometer, technical stethoscope).
Recommendation. It is convenient to diagnose engine malfunctions by ear with the help of a technical stethoscope. With it, you can quite accurately determine the source of extraneous noise.