1.5L REVOTORQ ENGINE 78 D. Oil Cooler. DESCRIPTION The oil cooler is to allow the engine's cooling system to remove excess heat from the oil. Engine oil is fed to the oil coolers from an adapter that is located between the engine block and the engine oil filter. The oil then flows through the tubes of the cooler while the engine coolant flows around the tubes. The heat absorbed by the engine’s cooling system is then transferred to the air as it passes through the vehicle’s radiator E. Hydraulic Lash Adjuster (HLA) 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. At all engine working conditions it maintains zero clearance between rollers rockers and valve stem. Maintenance Hydraulic lash adjuster uses Engine oil pressure for its operation. In case of a freshly assembled Engine, do not run for a long time; there are chances of valve train noise appearing when the engine is started. HLA noise can be heard as repeated tappet like noise when engine is running at low idle speed. Following procedure is recommended to eliminate the noise. Raise the Engine speed to 1000rpm without load (Vehicle stationary) to bleed the hydraulic chamber of HLA. The noise should disappear in15-30 seconds. If the noise still persists, run the engine further under same condition (no load at 1000 RPM) for several minutes. The noise should disappear in 3 to 30 mins, in few cases. In a very rare case if the noise is still heard, the HLA is stuck in compressed position and has to be replaced. NOTE There is no danger of damage to other components, if engine is run for few minutes on no load condition.
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