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FRONT COVER MAINTENANCE
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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INSPECTION - TM-5-4210-229-14P_412
TM5-4210-229-14&P 6-9.  CAMSHAFT AND GEAR MAINTENANCE This task cover:     a.  Removal b.  Inspection c.  Installation INITIAL SET-UP Tools Dial Indicator Camshaft Bearing Service Set (SE-2893) General Mechanics Tool Kit Micrometer Press Equipment Condition Para. Condition Description 6-6 Cylinder Head and Valves Removed 6-8 Front Cover Removed REMOVAL NOTE Prior to removal, cam lobe lift can be inspected with camshaft in engine by using a dial indicator.  Record the lift readings of each lobe.  Cam lobe lift shall be 0.2935 inch (7.455 mm).  If wear is 0.020 inch (.51 mm) or greater, replace the camshaft. a.  Crank engine until timing marks (1) on crank- shaft gear (2), camshaft gear (3), and idler gear (4) are in line. NOTE Before removing the camshaft gear (3), check the camshaft end clearance 0.005 to 0.013 in (0.13 to 0.33 mm).  If specification is not met, new parts are required. b.  Rotate camshaft gear (3), and by reaching through the holes in the gear, remove two cap- screws securing camshaft thrust plate to crank- case. c.  Remove camshaft.  (Support camshaft along its length, as it is being removed, to prevent cam lobes from damaging bushings). Materials/Parts Cleaning Solvent (Appendix D, Item 54) Camshaft (1802339C92) Camshaft Gear (675600C1) Bushings (680117C1) Thermomelt Crayon (Appendix D, Item 54a) INSPECTION Cleaning solvent, (Appendix D, Item 54), is both toxic and flammable.  Keep off skin.  Use only in a well ventilated area and avoid pro- longed breathing of vapors.  Keep away from open flames. Compressed air used for cleaning or drying can create airborne particles that may enter the eyes.  Pressure shall not exceed 30 psi (206 kPa).  Wearing of goggles is required to avoid injury to personnel. CAUTION Do not damage the journals and lobes of the camshaft, or the teeth of the gear. a.  Clean all parts in solvent (Appendix D, Item 54) and dry with compressed air. b.  Visually inspect camshaft lobes for scuffs, scores, or cracks. c.  Inspect  the  journals  for  wear.  Using  a micrometer, measure the camshaft journal to insure specifications of 2.2814 to 2.2825 in (57.948 to 57.976 mm) are met.  If the journals are worn beyond these limits, replace the cam- shaft. d.  Camshaft lobe wear check. (1) Compare lifting areas of the cam lobes with a new camshaft.  If excessive wear is visible, replace the camshaft 6-18

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