73 486 PL ENGINE P After engine assembly total engine should be tested for leakage as per the following procedure : TEST PROCEDURE FOR SYSTEMCHECK AFTER ENGINE ASSEMBLY i.e. leakage test of Intake and exhaust system (together) 1. Plug / Close the end of exhaust tail pipe. 2. Remove the flexible hose (r ibbed hose), connected from HFM (hot film mass flow sensor) to assembly connection pipe before throttle body. 3. Make suitable arrangements for connecting pressurised supply air at this point. Connect air pressure indicator gauge (range 0.0 - 1.0 bar max.) in the circuit. 4. Regulate the supply air pressure at 0.3 bar using pressure regulator (if available source air pressure is high). 5. Ensure that supply air pressure is 0.3 bar before connecting it to the engine. 6. Start supply of pressurised air (0.3 bar) at the point. 7. Wait for 2 minutes to develop & stabilize air pressure in the engine intake & exhaust system. 8. Close / Stop the air supply. The system is now under pressure at 0.3 bar. 9. If pressure does not drop below 0.2 bar, intake & exhaust system is considered satisfactory. Otherwise proceed as follows. 10. If system pressure drops below 0.2 bar, check for leakages in the intake & exhaust system (soap water solution may be used for the purpose). Rectify the leakages & repeat the procedure from step no. 4 for system re-check. Note : Engine after assembly should also be checked using the above procedure. Plug / Close the exhaust manifold outlet in this case & carryout all further steps.
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