Make sure of lack of resistance to rotation of a krylchatka of the fan at the cold engine, in case of need replace the coupling coupling.
At the hot engine resistance to rotation of a krylchatka, otherwise the coupling also, on the contrary, should be felt is subject to replacement.
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Make sure of absence excessive люфта the bearing, in case of need replace the coupling.
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Examine the coupling on existence of signs of development of leaks, make sure of absence of deformations of a bimetallic spring.
In case of need remove the coupling for more its detailed studying.
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