ENGINE 54 G. Valve Seat Insert : 1. For removing valve seat inserts from cylinder head use suitable boring machine. Bore old insert thin (About 0.5 mm thickness) and then pry it out. 2. Alternatively use a suitable turning tool to cut an annular groove into valve seat insert and then pull it out with a suitable puller. In order to avoid damaging machined cylinder head mating surface with crank case, place any soft protective sheet metal under supports of puller. 3. Measure valve seat insert bore diameter in cylinder head. 4. If boring and prying is done carefully without damaging valve seat insert bore in cylinder head, fitment of an oversize valve seat insert will not be necessary. 5. Re-machined valve seat insert bore in cylinder head must be exactly at right angle to cylinder head mating surface with crank case. 6. All specified dimensions should be strictly maintained to ensure proper interference of valve seat insert in its bore. 7. Clean valve seat insert and its bore in cylinder head thoroughly. 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. H. Hydraulic Lash Adjuster : 1. 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. 2. 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. I. Cylinder Head Cover : Clean the cylinder head cover surface, use liquid gasket during re-fitment otherwise it might result in high engine oil consumption.
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