Quantcast c.  Inspection (Contd) - TM-9-2815-225-34P_223

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TM 9-2815-225-34&P 3-40. CAMSHAFT CAM FOLLOWER, AND PUSHROD REPAIR (Contd) LOCATION/ITEM ACTION REMARKS c.  Inspection (Contd) 8. Camshaft (5) (Contd) c.  Inspect for cracks using Whole surface of camshaft (5) must magnetic method.  Apply 1500 be wetted with magnetic particle amperes DC longitudinal magnetic suspension before magnetizing current for locating open seams current is applied.  Camshaft (5) and presence of non-metallic must be magnetized by a single inclusions.  Apply 2000 amperes shot of current.  Disassemble and DC circular magnetizing current discard camshaft if not within for detecting grinding checks. limits. (1) Subsurface longitudinal indications:   None accepted on nose.   Short longitudinal indications up to 0.625 in. (15.875 mm) long are acceptable in critical region on cam surface 0.500 in. (12.700 mm) before nose and 0.375 in. (9.525 mm) after nose.   Not more than two indications are allowable in critical region of any one cam.   Light longitudinal indications not exceeding two in number are allowable outside of critical region.   Parallel indications must be separated by at least 0.625 in. (15.875 mm) of metal. (2) Open longitudinal indications are not allowable except on base circle.  A maximum of two longitudinal open indications 0.250 in. (6.350 mm) long or less will be allowed on base circle provided they are not closer than 0.250 in. (6.350 mm) and are visible only as tightly closed lines when surface is wiped clean.  Open indications shall not be closer than 0.1875 in. (4.763 mm) to edge of cam (5).  Circumferential indications, lying at an angle greater than 15° with longitudinal centerline, are not allowable. (3) Subsurface longitudinal indications:   0.125 in. (3.715 mm) indications are allowable on nose.   Light longitudinal indications up to 0.500 in. (12.700 mm) are allowable on ramp.   Not more than two indications are allowable on ramp or nose of any one cam (5). 3-192


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