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repair (cont) - TM-5-4210-220-34_413
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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view from gear end of blower
TM 5-4210-220-34 3-8. ENGINE Continued 3-8.3 Blower Continued (103)  Time  the  rotors  to  the  specified  clearance between  the  trailing  edge  of  the  right-hand helix rotor and the leading edge of the left- hand  helix  rotor  (’C’  clearance)  measured from  both  the  inlet  and  outlet  sides.  Then, check  the  clearance  between   the   leading edge  of  the  right-hand  helix  rotor  and  the trailing    edge    of    the    left-hand    rotor    (’C’ clearance)   for   the   minimum      clearance. Rotor-to-rotor     measurements     should     be taken  1  in.  (25  mm)  from  each  end  and  at the center of the blower. Clearance between    rotors:    CC    Minimum    clearance 0.004 -.008 in. (0.10 0.20 mm) C Minimum clearance 0.010 in. (0.25 mm) (104)   After   determining   the   amount   one   rotor must    be    revolved    to    obtain    the    proper clearance,   add   shims   to   the   back   of   the proper  gear  to  produce  the  desired  result. When   more   or   less   shims   are   required, both    gears    must    be    removed    from    the rotors.  Placing  a  0.003  in.  (0.08  mm)  shim in back of a rotor gear will revolve the rotor 0.001 in. (0.03 mm). (105)  Install  the  required  thickness   of   shims   to the back of the proper gear and next to the 0.140 in. (3.56 mm) thick gear spacer which is    against    the    bearing    inner    race    and reinstall both gears. Recheck the clearances between the rotor lobes. (106)  Determine  the  minimum  rotor  to  end  plate clearances  at  points  (A  and  B).  Insert  the feeler  gages  between  the  end  plates  and the ends of the rotors. This operation must be performed at  the  ends  of  each  lobe, making  12 measurements in all. (107)  Check   the   clearance   between   each   rotor lobe   and   the   blower   housing   at   both   the inlet and outlet side, 12  measurements  in all. The minimum clearances are as shown in center figure. NOTE After     the     blower     rotors     are timed, complete   assembly    of    the    blower    by carrying out steps 108 thru 111.

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