TM 10-3930-671-24 Fan Belt Tension Specification CAUTION When    tensioning    fan    belt,    tighten drive   belts   by   applying   pressure   to the alternator front housing only.  DO NOT     apply     pressure     to     the     rear housing     or     stator     or     damage     to equipment may result. NOTE New     belt     will     lose     a     substantial amount  of  the  original  tension  in  the first   few   hours   of   operation   as   the belt seats into the pulleys and should be   retensioned   accordingly.      Adjust belt  tension  to  2.5  -  3.2  lb  ft  (11.1  - 14.2 N•m) @ .20 in (5.2 mm) deflection at midpoint of span. 1. The    fan    belt    is    tensioned    by    adjusting    the alternator. 2. Loosen bolt at alternator adjusting  strap,  tighten belt   as   required,   and   retighten   bolt.      Cooling System Cooling System F-100