According to factory recommendations, the alternator belt should be replaced after 15 thousand km

We replace the timing belt every 75,000 km or if it shows signs of wear and undercutting of teeth, cracks, delamination of rubber and fabric base

Usually the camshaft oil seal is replaced during engine repairs and when oil leaks

Remove the cylinder head cover (see “Adjusting thermal clearances in the engine valve mechanism”).

Usually, the oil deflector caps are changed when there is an increased oil consumption, accompanied by a large emission of smoke from the muffler

Usually seals are changed due to oil leakage from under the seals or during engine repair