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Liner Removal
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Liner Inspection
TM 5-4210-220-34 3-8. ENGINE - Continued (2) Clean ring grooves with suitable carbon removal tool.  Piston skirt is tin plated and must not be wire brushed to remove hard carbon deposits.  Piston  crown  is  not  tin  plated  and  may  be  wire,  brushed  to  remove  hard carbon deposits. (3) Clean inside of crown area, and oil drain holes in ring groove area of skirt Do not enlarge drain holes during cleaning procedures. (4) Inspect  tin  plating  of  skirt  for  scoring,  abnormal  wear  symptoms,  cracked  or  damaged  ring  groove  lands. Replace if severely scored, damaged, or overheated. (15) Inspect crown for scoring or cracked or damaged ring groove lands.  Replace if severely scored or damaged. (6) Check tapered fire ring groove in crown with tool J24599.  Place wire of 0.106 in.  (2.692 mm) diameter In ring groove.  Slide wire completely around groove.  If the wire is below flush, at any point, piston crown must be replaced.  The 0.100 in.  (2.54 mm) diameter wire should be flush or protrude slightly from fire ring groove of piston. NOTE Components of piston assemblies can in certain instances be reused.  Undamaged piston pins, crowns, and bushings  that  meet  dimensional  limits  for  used  parts  can  be  reused  if  installed  within  the  same  piston assembly  from  which  they  were  removed.    The  crown,  pin  and  bushing  of  a  cross  head  piston  assembly should  be  considered  as  a  matched  set.    If  a  crown  is  replaced,  piston  pin  and  bushing  must  also  be replaced.  Similarly, if a bushing needs replacement, a new pin must also be used. (7) Check  for  bent  connecting  rod,  bearing  failure  causing  damage  to  rod  or  rod  cap,  and/or  discoloration  or blueing of parts.  Replace rod if any of above are found. (8) Check for cracks in rods as detailed in para. 2-7. (9) Tighten retaining nuts on connecting rod  to 70 ft lb (95 Nm). (10) Measure diameter (A and B).  The average measurement of (A and B) is the size at the split line (X) .  X = (A + B)/2. (11) Measure  diameter  (C).    The  difference  in measurements  (X   and   C)   gives   the   bore out-of-round    measurement;    maximum    of 0.005     in.          (0.127     mm)     is allowable. Replace rod if not within specification. (12) Obtain average bore diameter (Y).  Y = (C + X)/2.        Average    bore    diameter    must    be within  3.2495   3.2515   in.      (82.537   82.588 mm). Replace rod if not within specification. (13) Measure the dimensions (D1 and D2).  The difference    between    D1    and    D2    (taper) should     be     0.0005     in.          (0.0127     mm) maximum.        Replace    rod    if    not    within specification. 3-165

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