Quantcast FIGURE 3-129.  Measuring Camshaft End Play

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ARMY TM 9-2815-256-24 AIR FORCE TO 38G1-96-2 MARINE CORPS TM 2815-24/5 a. Measure camshaft end play as follows: (1)   Use a dial indicator and measure camshaft end play, refer to FIGURE 3-109.  New camshaft end play is 0.002 to 0.009 inch (0.05 to 0.23 mm).  Maximum allowable end play is 0.015 inch (0.38 mm). NOTE If end play is excessive, check thrust plate thickness using a newthrust plate and  a  feeler  gage  after  camshaft  is  removed,  refer  to  step  c.    If  camshaft end play is correct, measure timing gear backlash. FIGURE 3-129.  Measuring Camshaft End Play b. Clean and inspect camshaft and thrust plate as follows: WARNING Cleaning solvent is flammable and toxic to eyes, skin, and respiratory tract. Skin/eye   protection   required.      Avoid   repeated/prolonged   contact.      Good general ventilation is normally adequate. WARNING Compressed  air  used  for  cleaning  can  create  airborne  particles  that  may enter the eyes.  Pressure will not exceed 30 psig (207 kPa).  Eye protection required. (1)   Clean camshaft and thrust plate in solvent.  Dry with compressed air. (2)   Visually  inspect  camshaft  lobes  and  journals  for  wear  or  damage.    Replace  as  necessary.    New  cam followers  can  be  used  with  old  camshaft  (if  camshaft  is  serviceable).    However,  do  not  reuse  old  cam followers with a new camshaft. NOTE Very light score marks can be found, but are acceptable if valve lift is within specification. Pitting or galling dictates replacement.  Refer to paragraph 3- 32.2.  for valve lift measurement. 3-170


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