2.9.20.9. Check of the coupling of the drive of the cooling fan
Magnetic coupling
Cross-section of the magnetic coupling of the fan
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- On the stopped engine to a vreshcheyta the fan manually be also convinced that it rotates evenly and silently.
- Replace the fan coupling if it does not show resistance to rotation or works with noise.
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Viscous coupling
Cross-section of the viscous coupling of the fan
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- Warm up the engine up to the normal working temperature and support its frequency of rotation from 4000 to 4500 rpm. Do not close a radiator, otherwise the coupling will correctly not react to changes of temperature.
- By means of the thermometer (the index of temperature) be convinced that when heating the engine to 90 — 95 °C the speed of rotation of the fan increases approximately by 1000 rpm. At correctly working coupling it will be noticeable aurally. The faulty coupling should be replaced.
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