NANO

152 ENGINE 273 MPFI ENGINE TESTING After assembly of the engine, mount engine on test bed, prepare engine for starting and conduct the test in following manner. • Connect oil pressure gauge and temperature gauge. • Connect coolant hose to and from radiator. Fill coolant in the cooling system. Fit radiator cap. • Fill required quantity of recommended oil in the oil sump. • Mount air cleaner assembly on test bed suitably. • Connect air cleaner outlet to engine intake using suitable hoses. • Make suitable linkage for controlling accelerator lever. • Connect exhaust pipe to exhaust manifold. • Connect battery cables to starter motor. Ensure that -ve terminal is earthed. • Crank engine with accelerator lever in idling position. Allow oil to be circulated through the system. Check and ensure that oil pressure indicated by gauge is satisfactory. • Slightly raise the engine speed and check for any oil, fuel, coolant and air leakages. Rectify if any. Check colour of the exhaust gas. Check for any unusual noise from the engine. • Connect engine to dynamometer and run for running in test as per test schedule. Engine running in test schedule : Engine Speed Time Torque (RPM) (minutes) (mkg) 800 5 0.0 2000 5 2.3 2500 5 4.6 3000 5 5.8 3500 5 4.9 2500 5 8.2 • After running in test of the engine, reduce dynamometer load to zero and allow engine to run at idling speed for about 5 minutes and then stop it. • Allow engine to cool down for about 3 hours. Then remove cylinder head cover. Loosen cylinder head mounting bolt by quarter turn and retighten immediately to the specified torque in the correct sequence. • Complete cylinder head tightening operation in the same sequence and with the same torque. Start the engine and check for any fuel leakages. Rectify, if necessary. INSTALLATION OF ENGINE ON VEHICLE Follow the removal of engine from vehicle procedure in the reverse order.