To check the tension, you can use the Opel KM 128 tool. The tension should be in the range of 25-30 kgf for a worn belt (in no case below 25 kgf) and 45 kgf for a new belt.
If the specified values do not match, unscrew the nut securing the generator to the tension bar, adjust the belt tension and tighten the tension bar nut.
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