J. CAMSHAFT 1. Check cam shaft run out at 2nd journal by supporting it on V-block at 1st and 3rd journal. 2. Check cam shaft journal dimensions. Record the readings. 3. Carry out visual inspection of cam shaft for: Overheating of journals, this is indicated • by bluish/ brown colour. Deep scoring marks on journals and cam • lobes Cracks, which should be checked on a • magnetic crack detector. 4. Check hardness of cam shaft journals and cam lobes, it should be 45 HRC. Camshaft journal & bearing bore dimensions CAM SHAFT BEARING BORE DIAMETER IN CYLINDER HEAD (MM) CAM SHAFT BEARING JOURNAL DIAMETER (MM) Standard 24+0.021, -0.000 24-0.020, -0.041 Bore dia. In 1st cap for front oil seal (mm) Front 42 +0.025, -0.0 Maximum permissible run out of camshaft bearing journal (mm) 0.02 Maximum permissible axial play of the camshaft in installed condition (mm) 0.100-0.177 Camshaft bearing clearance 0.02-0.062 Diesel Engine Ph-2 (CAFÉ) 72
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