1.5L REVOTORQ ENGINE 142 7. Clean valve seat insert and its bore in cylinder head thoroughly. F. Just Before Installation 1. Place valve seat insert in mixture of Methanol and dry ice for about 20-30 minutes to bring temperature down to -150ºC. 2. Heat cylinder head to approximately 80ºC in hot water bath. 3. Install valve seat insert in cylinder head bore quickly by light hammering. 4. Machine valve seat in cylinder head. G. Cam Shaft 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. H. Hydraulic Lash Adjuster Hydraulic Lash Adjuster supports the pivot end of the rocker arm while automatically controlling the rocker arm position to keep it in contact with the camshafts and valve. The range of the hydraulic lash adjuster accommodates engine build tolerances; hence no adjustment is required during engine assembly. It also compensates for variation that occurs during the life of the engine. For information on HLA and inspection refer Lubrication section. x. REMOVAL OF CYLINDER BLOCK SUBASSEMBLIES 1. Remove the crankshaft oil seal. 2. Remove the mounting bolts of the crankshaft oil seal cover and take out the cover from the case. 3. Turn the Crankshaft and bring a pair of pistons near BDC position. Unscrew connecting rod bearing cap mounting nuts.
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