ENGINE 121 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. E. PISTON COOLING NOZZLE Piston cooling nozzle is fitted on the block such that the oil sprayed from it hits the under side of the piston crown. This is very essential to cool the piston crown temperature. Refer Cylinder Block dismantling and Assembly in this section for removal and fitment instructions. I. OIL PRESSURE SWITCH An Oil pressure switch is used as a safety device to indicate loss in oil pressure. In a vehicle when the ignition is switched ON the oil pressure warning light is illuminated because the engine is not running and hence no oil pressure is generated. When the engine is running, pressure is built up in the engine and the oil pressure warning light goes off. If the oil pressure is not as per the specified value, the oil pressure light in the Instrument Cluster glows. The most common reason for low oil pressure is loss of oil.
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