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Inspection (CONT) - TM-5-4210-220-12_659
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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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Cylinder Block Installation
TM 5-4210-220-12 4-28.  ENGINE - Continued 4-28.3 Air Compressor - Continued (b) Compressors  with  a  ball-type  rear  bearing  have  a  seal  and  spring  or  bowed  washer  in  the  rear bearing cap. Check the wear of the seal where it contacts the crankshaft. The seal must be replaced if grooved more than 0.005 in. (0.31 mm).  Measure outside diameter of seal ring.  If diameter is not within specifications, the seal ring must be replaced. Check the oil seal spring for loads at assembled heights. Spring must conform to specifications. Some compressors have bowed washers rather than oil seal springs.  Examine bowed washer for wear.  If worn, replace. Seal Ring Outside Diameter............ 0.633/0.632 in. (16.08/16.05 mm). (12) Check the crankcase as described below. (a) Examine crankcase for cracks and damage to gasket surfaces.  Replace if necessary. (b) Inspect  studs  in  crankcase.    Replace  any  bent  or  damaged  studs.    Check  all  threaded  holes  for damaged threads.  If threads are damaged install hell-coil (thread insert). (c) Measure   the   crankcase   bearing   bore   diameter   and   if   not   within   specifications,   replace   the crankcase. Bearing Bore Diameters.................. 2.8350/2.8344 in. (72.009/71.993 mm) (13) To repair the air compressor governor refer to para. 4-22.11. NOTE To  reassemble  the  air  compressor  carry  out  steps  m.  thru  v.    Do  not  attempt  to  force  parts  into position  during  assembly,  as  this  could  cause  damage.   Coat  the  crankshaft,  bearings,  connecting rod  bearings,  pistons,  pin,  and  cylinder  block  bore  with  engine  oil  (item  17,  Appendix  E)  before reassembly. m.  Crankshaft and Bearing Installation. (1) The  crankshaft  should  be  installed  in  the  crankcase  before  rear  end  cap  is  installed.    Bearings  should already be pressed on the crankshaft.  Maneuver crankshaft and bearing assembly into crankcase.  Be sure  that  the  front  bearing  is  recessed  enough  to  allow  installation  of  lock  ring  into  end  of  crankcase housing. (2) Install lock ring used to retain the front bearing. (3) On compressors with rear ball bearings, place a new gasket on the cap mating surface install the spring or bowed washer in the end cap.  Outer diameter of washer must contact the bottom of the hole, in the end cap.  Install the seal in the end cap.  Lubricate seal with oil install end cap making sure the seal and spring or bowed washer does not fall out. 4-546

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