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Rocker Arms, Cam Follower, and Push Rods
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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INSTALLATION - TM-5-4210-220-34_172
TM 5-4210-220-34 2-19. ENGINE - Continued (4) Loosen  the  locknuts  at  the  upper  ends  of  the  push  rods,  next  to  the  devises,  and  unscrew  the  rocker arms from the push rods. NOTE If  the  rocker  arms  and  shafts  from  two  or  more  cylinders  are  to  be  removed,  tag  them  so  they  may  be reinstalled In their original positions. (5) When  removing  the  cam  followers  and  associated  parts,  tag  them  so  they  may  be  reinstalled  in  their original location. (6) Install  remover  J3092-01,  flat  washer,  and  the  locknut  on  the  push  rod,  with  the  lower  end  of  the  tool resting on the upper spring seat. (7) Thread the nut down to compress the spring. (8) Remove the spring seat retainer from the groove in the cylinder head. (9) Unscrew the locknut to release the spring Then remove the nut, flat washer, and tool from the push rod. (10)  Pull the push rod, spring, spring seats, and cam follower out of the cylinder head. INSPECTION (1) Clean the cam followers and wash with engine oil (item 17, Appendix B). WARNING Dry cleaning solvent P-D-680 (safety or Stoddard’s solvent) is potentially dangerous.  Avoid repeated and prolonged  breathing  of  vapors  and  skin  contact  with  the  liquid.    Do  not  use  near  open  flame,  arcing equipment or other ignition sources.  Always wear eye protection and protective clothing.  The flash point of P-D-680 is 100 to 138 deg.  F (30 to 59 deg.  C). Death or serious injury could occur if compressed air is directed against the skin.  Do not use compressed air for cleaning or drying unless the pressure is/has been reduced to 30 psi (2.11 kg/cm2) or less.  When working   with   compressed   air,   always   use   chip   guards   eye   protection   and   other   personal   protective equipment. (2) Wash all other components in dry cleaning solvent (item 10, Appendix B) and dry with compressed air. Use a small wire to clean out the drilled od passages in the rocker arms and rocker shaft bolts. (3) Inspect the rocker arm shaft and rocker arm bushings for wear.  A maximum shaft to bushing clearance of 0.004 in.  (0.10 mm) is allowable with used parts.  Service replacement bushings must be reamed to size after installation. (4) Inspect the rocker arms for galling or wear on the pallets (valve or Injector contact surfaces) If worn, the surface may be refaced up to a maximum of 0.010 in.  (0.25 mm).  However, proceed with caution when surface  grinding  to  avoid  overheating  the  rocker  arm.    Maintain  the  radius  and  finish  as  close  to  the original surface as possible.  Also inspect the valve bridges for wear. 2-175

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