NEXON BSVI MCE - SERVICE MANUAL

1.5L REVOTORQ BS VI ENGINE 84 D. Oil Cooler Oil cooler is heat exchanger which uses coolant to reduce the temperature of oil coming from the oil pump. It is mounted on the cylinder block with an adapter. 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 accommo- dates 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 En- gine, 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 . F. Piston Cooling Nozzle Piston cooling nozzles are fitted on the block such that the oil sprayed from it hits the underside of the piston crown / gallery. This is very essential to bring down the piston crown temperature. G. Oil Pressure Switch Oil pressure switch sends the signal to low oil pres- sure indicator lamp provided on the vehicle instrument panel by closing the circuit to ground when the oil pressure is low / below the optimum value.