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REMOVAL - TM-5-4210-220-12_313
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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INSPECTION (cont) - TM-5-4210-220-12_315
TM 5-4210-220-12 4-15.  AUXILIARY POWER UNIT - Continued INSPECTION (1) Check  crankshaft  and  camshafts  for  cracks  using  the  Magnaflux  method,  or  similar,  see  para.  4-9.    Replace components if cracks are detected. (2) Examine  shaft  gears  for  wear,  replace  shaft  if teeth are cracked or pitted. (3) Examine crankshaft main journals and crank pin journal   for   seizure   marks   or   grooves.      Light grooves can be removed with emery cloth (Item 13,  Appendix  E).    Replace  crankshaft  if  marks are severe. (4) Measure  crankshaft  journal  to  crankcase  cover bearing   in   two   directions   at   90   deg.   to   each other.        Journal    must    be    between    1.1028    - 1.1032    in.    (27.90    -    28.00    mm).        Replace crankshaft    if    overworn.        Journal    cannot    be reground. (5) Measure     main     crankshaft     journals     in     two directions at 90 deg. to each other. (6) If any journal is more than 0.004 in. (0.10 mm) out of round, or total wear exceeds 0.004 in. (0.10 mm) replace or regrind crankshaft to next undersize. Crankshaft Journals Nominal 1.5756 - 1.5760 in. (39.99 - 40.00 mm) Diameter 1st undersize 1.5658 - 1.5662 in. (39.74 - 39.75 mm) 2nd undersize 1.5559 - 1.5563 in. (39.49 - 39.50) Crankshaft Journal Nominal 1.5772 - 1.5780 in. (40.03 - 40.05 mm) Bearings Diameter 1st undersize 1.5673 - 1.5681 in. (39.78 - 39.80 mm) 2nd undersize 1.5575 - 1.5586 in. (39.53 - 39.55 mm) Bearing to journal clearance at assembly should be   0.0012   -   0.0024   in.   (0.003   -   0.006   mm), bearings   are   worn   out   if   clearance   exceeds 0.007 in. (0.17 mm). (7) Restore  journal  fillet  radius  as  illustrated.    Do not  remove  any  material  from  journal  flanges facing side thrust washers. (8) Remove  expansion  plugs  from  crankshaft  and clean out oil ways with wire 4-177

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