KRYOTEC ENGINE 22 4. ENGINE TESTS AND MAINTENANCE A. PRELIMINARY INSPECTION NOTE It is always advisable to first use the diagnostic tool and rectify the electrical faults, before commencing with mechanical repairs/ troubleshooting. Refer ENGINE MANAGEMENT SYSTEM section in this group for procedure. General Check for leakage of Oil, fuel, and Coolant. Check for overheating of engine. Check for unusual smoke. If there is any fault in the Engine Management system (EMS) then the MIL indicator in the instrument cluster will come ON. In such a case connect the diagnostic tester. (For procedure refer EMS section). Before proceeding to carry out actual reconditioning of engine, it is desirable to have a preliminary inspection of engine to ascertain whether an engine reconditioning is necessary and if so, to what extent. Most common reasons for which engine is reconditioned are 1. Loss of power. 2. Excessive engine oil consumption. 3. Extremely low engine oil pressure. 4. Mechanical failures. B. ENGINE TESTS CYLINDER COMPRESSION TEST 1. Warm up engine to operating temperature (approximately 80 °C, 176 °F). 2. Shut the engine off. 3. Check that fuse of the electric fuel pump has been removed, before removing the injectors. 4. Remove the fuel injector. 5. Install the dummy injector (5412 5890 0702) complete with the injector claw into fuel injector hole of cylinder to be tested. 6. Install the clamp and tighten the nut 25 N·m (18 ft. lbs.). 7. Connect the compression tester to the fitting 8. Test compression pressure by cranking engine with starter for at least 8 revolutions. Description Specification Difference Between Cylinders Cylinder Compression 21 – 25 bar (304-362 psi) 5 bar (73 psi) 9. Carry out test procedure at the remaining cylinders in the same way. 10. Check that there is not a great difference between the pressure readings for the cylinders. 11. Remove the dummy injector complete with fitting from cylinder head. 12. Install the fuel injector
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