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by electronmirror »
Presuming you are referring to the aux drive belt sometimes called 'the serpentine belt'
From my BOL which does cover the HDI engine:
"auxiliary drive belt eccentric roller securing bolt, 43Nm = 32lbf/ft"
Happy spannering
HTH
Ted
2010 C5 2.0 diesel(163) Exclusive Tourer (133,509miles)
1999 Xantia Exclusive Estate 110 Hdi Mauritius Blue with self peeling lacquer finish (276,174miles)
1991 XM Prestige 2.0 Auto(157,000 miles) gone but not forgotten