Quantcast Figure 5-6.  Rivnut Removal

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TM 10-5411-224-14 (f) Coat rivnut body with fiber filled polyester resin before installing. (g) Insert rivnut in hole.  Make sure sheets are held tightly together before pulling. (h) With pull-up stud parallel to axis of rivnut, pull up on rivnut.  Exert firm pressure but do not  bend or buckle metal sheets. (i) Make  sure  fastened  parts  are  not  loose,  rivnut  does  not  rotate,  and  rivnut  head  is  seated  tightly against surface.  Make sure rivnut threads are in good condition.  If threads are damaged or rivnut is improperly installed, remove it and install a new one. (2) Removal (Figure 5-6). WARNING Drilling creates metal chips which may enter eyes and cause serious injury.  Eye protection is required. (a) Drill through head of rivnut, using same size drill used to make original  hole.  Counterbore in rivnut will act as a drill guide. (b) Remove head of rivnut. CAUTION Do not puncture opposite face sheet of panel when punching out rivnut shank. (c) Punch  out  shank  of  rivnut  using  a  pin  punch  slightly  smaller  than  hole  in  structure.    Punch  only enough to disengage.  Move rivnut aside to install new rivnut. (3) Repair  (Figure  5-7).    When  excessive  torque  is  applied  on  screws  attached  on  rivnuts,  it  may  cause  a rivnut  to  spin  (turn).    Table  5-4  provides  the  maximum  torque  requirement  for  hardware  to  prevent  rivnut  turning.    To correct a spinning rivnut, proceed as follows: (a) Drill  a  .062  (+  .003,  -  .001)  diameter  hole  by  1.00  inch  long  on  the  stem  of  the  spinning  rivnut  as shown in figure 5-7. (b) Install a headless straight pin. Figure 5-6.  Rivnut Removal 5-12


 


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