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INSPECTION - TM-5-4210-220-34_447
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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ASSEMBLY - TM-5-4210-220-34_449
TM 5-4210-220-34 3-8. ENGINE - Continued 3-8.8 Camshafts - Continued (7) Examine both faces of each camshaft end bearing and thrust washer.  Also, check the thrust surface of the camshaft gear for scoring or wearing.  Thrust surfaces that are not damaged too severely can be smoothed down with an oil stone.  Thrust washer thickness should be 0.119 to 0.122 in.  (3.02 to 3.10 mm). (8) Irspect the intermediate bearings, and the bushings in the front and rear camshaft end bearings.  Replace the bearings  or  bushings  if  they  are  worn  excessively,  or  if  the  bushings  In  the  end  bearings  have  turned. Bearing  to  shaft  clearance,  front  and  rear,  should  be  0.0025  to  0.0040  in.    (0.064  to  0.102  mm).    The absolute  limit  is  0.0060  in.    (0.152  mm).    The  intermediate  bearing  to  shaft  clearance  should  be  0.0025  to 0.0050 in.  (0.064 to 0.127 mm), with a limit at (0.0090 in.  (O 229 mm). NOTE Rear camshaft and bearings are available in 0.010 in.  (0.254 mm) or 0.020 in.  (0.51 mm) undersize for use with worn shafts which exceed the specified clearance limits.  New bushings must be finish bored to a 20 rms finish after installation and checked for the proper press fit, which  is  Indicated  if  the  bushings  will  not move  when  a  2000  lb  (910  kg)  end  load  is  applied.    Also,  the  inside  diameter  of  the  bushings  must  be square with the rear face of the bearing within 0.0015 in.  (0.038 mm) total indicator reading, and concentric with  the  outside  diameter  of  the  bearing  housing  within  0.002  in.    (0.05  mm)  total  indicator  reading.    The bushings  must  project  0.045  In.    0.055  in.    (1.14  to  1.40  mm)  from  each  end  of  the  rear  camshaft  end bearings.  The bushings in the front camshaft end bearings must be flush with the ends of the bushing bore. (9) Examine the intermediate bearing lock screws and the cylinder block tapped holes for damaged or stripped threads. (10) Replace the seal In the left bank camshaft front end bearing.  Also, examine the spacer used at the front end of each camshaft.  The outside diameter of the spacer used in the left bank front end bearing must provide a smooth oil seal contact surface.  The outside diameter Is not ground and polished on the original spacer used on  the  right  bank  camshaft.    Only  the  polished  spacer  is  available  for  service  and  may  be  used  in  either position. (11) Examine the teeth on the water pump drive gear and the camshaft gears for wear, pitting or scoring.  Also check  the  key  ways,  and  all  the  threaded  holes  in  the  gears  and  camshaft  pulley  for  stripped  or  damaged threads. (12) Repair all parts showing signs of damage, and replace parts that can not be repaired ASSEMBLY (1) Press new plugs into each end of each camshaft as shown. 3-158

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