Remove the hooks from the upper protection cover of the toothed belt and remove it.
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Rotate the crankshaft until the camshaft cogwheel is at TDC 1. The mark on the camshaft wheel should coincide with the arrow on the toothed belt protection.
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Turn crankshaft back slightly.
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Loosen the tensioning pulley -arrow-.
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Remove notched belt.
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Remove the cogwheel from the camshaft. To loosen the bolt, immobilise the cogwheel using the retention tool -T20018A-.