1.2L REVOTRON TWIN CYLINDER CNG ENGINE 85 3. Oil Strainer : The oil strainer is fitted to the oil pump along with O-ring, through which the oil is drawn from oil sump and supplied to the oil gallery. The strainer acts like a filter and blocks the contaminants from entering the oil pump. 4. Oil Pressure Switch Sensor : Oil pressure switch sends the signal to low oil pressure indicator lamp provided on the vehicle instrument panel by closing the circuit to ground when the oil pressure is low / below the optimum value. 5. 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 / tappet 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 500rpm without load (Vehicle stationary) to bleed the hydraulic chamber of HLA. The noise should disappear in 15-30 seconds. If the noise still persists, run the engine further under same condition (no load at 500 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 6. Chain Tensioner The tensioner ensures the correct and necessary tension of the timing chain that surrounds the crankshaft sprocket and the camshaft sprocket. It exerts full control, making the chain run smoothly, preventing it from rattling and coming off the sprockets.
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