Diesel engine simple fault phenomenon, judgment, inspection, repair method

1: Cause and remedy for diesel engine failure to start: No. Fault characteristics and cause of failure Remedy 1 Fuel system failure: Diesel engine is not ignited after being started by the starter motor, no return oil is returned to the oil return pipe (1) Air in the fuel system is inspected to check the fuel line If the connector is loose, remove air from the fuel system. A: Loosen the bleeder screws on the fuel injection pump and fuel filter, and pump the oil with the hand pump until the bleed screw is tightened after there is no air bubbles in the spilled fuel. Then pump the oil. When there is oil return in the return pipe, tighten the hand pump again. B: Loosen the nut of the high pressure fuel line at the injector end, and the spring seat of the high injection pump plunger. When there is no bubble in the fuel injected from the nozzle, tighten the nut, and then repeat several times. , so that each fuel injector is full of fuel. (2) The fuel line is blocked Check that the lines are unblocked (3) The fuel filter is obstructed Clean the filter or replace the filter element (4) The oil pump does not supply oil or intermittent oil supply (5) Check the intake pipe for leaks, The filter on the inlet fitting is blocked. If the oil is still not supplied after removal, check that the fuel injection pipe and the oil delivery pump (6) have very little fuel injection. Do not spray oil or atomize the oil to remove the fuel injector and connect it to the high pressure oil pump. Plug the spring, observe the spray and remove it if necessary. Check and adjust the injection pressure on the injection test bench to the specified range or replace the injector assembly (7) The position of the handle of the fuel pump controller is not correct. When starting, push the handle to idle position, speed 700-900rpm ( r/min) Position 2 Left and right positions 2 Electric start system failure (1) Circuit wiring error or poor contact Check whether the wiring is correct and secure (2) Insufficient battery power Use a battery with sufficient electric power or increase the battery in parallel use (3) Start the motor brush No contact with the commutator or poor contact repair or exchange of carbon brush, clean the commutator surface with wooden sandpaper, and blow the net, or adjust the pressure of the brush spring 3 Insufficient compression pressure in the cylinder; normal injection but no ignition, smoke exhaust There is fuel in the pipe (1) Excessive wear of the piston ring or cylinder liner Replace the piston ring and replace the cylinder liner depending on the wear condition. (2) Valve leakage Check the tightness of the valve clearance, valve spring, valve guide, and valve seat. The seal is not good and should be repaired. And Grinding (3) Exhaust air gap or excessive volume of combustion chamber Check whether the piston belongs to this model, if necessary, measure the air gap or combustion chamber volume 4 injection advance angle Too early or too late, or even a difference of 1800; The diesel engine sprays but does not catch fire or starts to fire again. Check whether the scale line on the coupling plate of the fuel pump drive shaft is correct or loose. If it does not meet the requirements, it should be readjusted. Gas phase 6 Ambient temperature is too low; Start-up time is long and no ignition occurs. Take corresponding low-temperature start-up measures according to the actual ambient temperature. 2: Causes and remedies of diesel engine power shortage. No. Fault characteristics and cause of failure Remedy 1 Fuel system failure: Increase Throttle power or speed remains low (1) Fuel line, fuel filter enters air or obstructs air in drain line or replaces fuel filter cartridge (2) Fuel injection pump does not atomize Replace spray Oiler (3) Insufficient atomization of injector or low fuel injection pressure Check the injector, adjust the spring pressure 2 infeed, exhaust system failure: Higher temperature than normal, poor smoke quality (1) Air filter Clogged obstructer Remove air cleaner cartridge or remove dust from paper filter element, replace if necessary; and check if the oil level is normal (2) Block or take over exhaust pipe The length, turning radius is too small, the elbow too much eliminates the carbon deposit in the flue pipe; reinstall the exhaust pipe, the elbow can not be more than 3, and there is a large enough exhaust cross section 3 fuel injection advance angle or intake and exhaust phase Change: Check the performance difference of the speed at each speed. Check whether the two screws at the fuel pump drive shaft are loose. Tighten the fuel after correcting the injection advance angle. If necessary, check the valve timing and valve clearance. 4. The diesel engine overheats and the ambient temperature is too high. : The temperature of oil and cooling water is very high, and the temperature of exhaust fumes is also greatly improved. Check the cooler and radiator, and remove the scale; check whether the pipe diameter is too small. If the ambient temperature is too high should improve the ventilation, temporarily strengthen the cooling measures 5 Cylinder head assembly failure: not only lack of power at this time, performance decline, but also leaks, black smoke intake, abnormal knocking sound and so on. 1) Air leakage from the joint between the cylinder head and the machine body. There is a flow of air from the gasket at the time of shifting: Loose cylinder head bolt nut or liner damage, the cylinder and the body joint surface is not tightly tighten the large torque according to the specified torque Column nut or cylinder head gasket replacement, if necessary, repair scraping joint surface (2) intake and exhaust valve air leakage inspection intake and exhaust valve, repair grinding valve and valve seat mating surface (3) valve spring damage replacement damaged Spring (4) Incorrect valve clearance Recalibration of valve clearance to the specified value (5) Leakage of the injector hole or damage to the copper gasket; piston ring is stuck, the valve stem bites and the cylinder compression pressure is insufficient to remove the inspection, cleaning and Replace the damaged parts 6 Biting hairs on the connecting rod bearing and the crankshaft connecting rod surface; abnormal sound, and organic oil pressure drop, etc. Now disassemble the diesel engine side cover, check the lateral gap of the connecting rod big head, and see if the connecting rod big head can After moving, if it can not move, it means biting, should grind shaft journal and replace connecting rod bearing 7 turbocharger failure: speed drop, inlet pressure drop, air leakage or abnormal sound, etc. (1) Pressurization Bearing wear, rotor rubbing phenomenon overhaul or replace the bearing (2) Compressor, turbine intake manifold fouling, obstruction or air leakage clean inlet port, shell, remove the net impeller; tighten the joint nut, clamp, etc. 3: Malfunction of engine malfunctioning and troubleshooting method No. Feature and cause of failure Troubleshooting method 1 Fuel injection time is too early: A rhythmic crisp metallic hammer sounds in the cylinder to adjust the injection advance angle 2 Fuel injection time Late: a deep and unclear percussive sound is emitted in the cylinder. The clearance between the piston pin and the connecting rod small-size bushing hole is too loose: there is a slight and sharp sound during operation. This kind of sound is particularly clear when idle. The small head bushing makes it within the specified range. 4 The clearance between the piston and the cylinder liner is too large: When the operation hears the impact sound on the outer wall of the cylinder body, when the rotation speed increases, the impact sound intensifies to replace the piston or visual wear. Replace the cylinder sleeve 5 The wear of the connecting rod bearing makes the fit clearance too large: During the operation, the mechanical impact sound is heard in the crankcase. When the speed is suddenly reduced, a heavy and powerful impact sound can be heard to demolition the bearing bush. If necessary, replace the bearing bush. Crankshaft rolling bearing radial clearance is too small: in the operation of a particularly sharp and harsh sound, increase the throttle when the sound is more clear, the crankshaft rolling main bearing radial clearance is too large: running "Hahoo" sound inspection has a ring The main rolling bearing, if necessary, replace the 7 crankshaft front and rear thrust bearing wear, axial clearance is too large, causing the crankshaft to swim back and forth: when the diesel engine is idle, hear the collision sound of the crankshaft forward and backward movement check radial clearance and thrust bearing The degree of wear, if necessary, should be replaced 8 Valve spring breaks, lifter bent, putter sleeve worn: a rhythmic, slightly tapping sound at the cylinder head, replacement of damaged parts, and re-adjustment of valve clearance 9 Valve-touching piston : Heavy, uniform and rhythmic percussive sound is emitted from the cylinder head during operation. Gently squeeze the nut of the cylinder head cover with your fingers to feel the impact. Remove the cylinder head cover. , Check the causes of the collision and adjust the valve clearance. Check if the piston model is adjusted if necessary. If there is a collision, dig deep valve pits or increase the thickness of 0.20mm or 0.40mm. The copper gear pad 10 with the same shape as the bottom surface of the cylinder head wears gears, and the backlash is too large: it is issued at the front cover. Abnormal sound, when a sudden drop in speed can hear the impact of sound adjustment gear gap, depending on the situation of the replacement of gear 11 rocker arm adjustment screw and putter spherical seat between the oil: hear the dry friction at the cylinder head issued " creak "sound remove the cylinder head cover, oil check rocker added Note oil supply system, the supply pump is working properly, the line, the rocker inner hole injection, the rocker bearings 12 is clogged if the intake and exhaust valve clearance Too large: Large, rhythmic sounds heard at the cylinder head. Recalibrated valve clearance 13 Unusual impact sound when the turbocharger is running. Check for worn bearings and bent blades. Simultaneously measure the main clearance and make adjustments and replace damaged parts. Clean the oil filter of the supercharger and the oil inlet and outlet pipes to ensure the smooth flow of the oil. 4: Causes and troubleshooting of abnormal exhaust smoke of the diesel engine No. Features and causes of failure 1 Exhaust smoke: (1) Diesel engine The load exceeds the specified limit to reduce the load within the specified range. (2) The fuel supply of each cylinder is not uniform. Adjust the injection pump. (3) Incorrect valve clearance and poor valve sealing result in valve leakage, deteriorating combustion. Adjust valve clearance, check seal. Cone, and eliminate defects (4) Fuel injection advance angle is too small, fuel injection too late to make part of the fuel burning in the exhaust pipe to adjust the injection advance angle (5) Insufficient intake air: air filter or intake pipe obstruction , Turbocharger compressor casing dirty cleaning and dust removal, if necessary, replace the filter element (6) turbocharger elastic gas seal ring burned or worn, turbine joint leakage, etc. Check or replace the gas seal ring Tighten the screws on the combination surface 2 White smoke from the exhaust cap (1) The fuel injector has poor atomization of the fuel spray and there is a phenomenon of oil dripping. The fuel injection pressure is too low Check the oil nozzle coupling for grinding or replacement. Re-adjust the fuel injection pressure to the specified range (2) When the diesel engine is started, the individual cylinders will not burn (especially in the winter). Increase the speed and load appropriately. Run for some time. 3 Exhaust emission Blue smoke: (1) Air filter Blockage, poor air intake or excessive oil in the oil pan (oil bath type air filter) Check and clean the air filter to reduce the oil to the specified level (2) The piston ring is stuck or excessively worn, insufficient elasticity, Piston ring chamfer direction is reversed during installation, so that the oil enters the combustion chamber to disassemble the piston ring. If necessary, replace (3) Long-term low load (40% of rated power) operation, and the clearance between piston and cylinder sleeve is large, so that The oil is easy to enter into the combustion chamber to increase the load appropriately; the power used when matching is appropriate (4) The oil in the oil pan is added too much Press the oil marking line to fill the oil 4 The moisture condenses in the exhaust gas: The cylinder head cracks and cools Liquid Enters the Cylinder Replaces the Cylinder Head 5: Malfunction Causes and Remedies for Abnormal Oil Pressure No. Fault Features and Causes Remedy 1 Oil pressure drops, pressure regulator valve does not re-adjust, pressure Fluctuation in the meter reading (1) Check the oil leakage in the oil pipe, tighten the nut (2) Pump the air into the air, the oil in the oil pan is insufficient to fill the specified plane (3) the crankshaft thrust bearing, the crankshaft output flange end oil seal, camshaft bearing and connecting rod bearing severe oil leakage around maintenance, wear value exceeds a predetermined range should be replaced (4) breaking the connection between the tubing rocker shaft, the transmission gear lubricating nozzle means or drain off after dismantling repair or replacement (5) blocking the oil cooler or the oil filter, cooler tubing rupture: the oil drain gasket sheet or blowing clean up, welding or exchange core, the fine filter centrifugal oil in aluminum The swarf means that the alloy layer of the connecting rod bearing shell is peeled off. The connecting rod bearing shell should be dismantled in time and the damaged bearing should be replaced. The inorganic oil pressure of the sealing gasket 2 should be checked and replaced in time. The pressure gauge should not move (1) The oil pressure gauge is damaged. Replace (2) ) Obstructed overhaul of the oil passage after obstructing and cleaning, blowing (3) The oil pump is seriously damaged or improperly assembled. The clearance adjustment is performed after the inspection and the performance test of the oil pump is performed. (4) The oil pressure regulating valve fails. After the oil temperature is too high, too much consumption Reference fault causes and troubleshooting features and causes negative value exceeds a predetermined oil temperature meter reading process, intensive cooling: replace the spring which damage to the spring, the pressure regulating valve sealing surface grinding 6 Still high, exhaust smoke at the same time (1) Excessive engine load reduces load (2) Oil cooler or radiator blocked Clean radiator or radiator circuit (3) Insufficient amount of cooling water or fan air volume And adjust the delta rubber belt tension so that the pump and fan reach the required speed (4) The oil is less than the filling oil to the specified plane (5) The thermometer indicates the inaccurate effect or replacement 7: The failure of the oil sump oil level rise and Troubleshooting Method No. Fault Feature and Cause Remedy Method Oil return to yellow foam, steam pipe filter surface has water vapor condensation 1 Cylinder sleeve seal water ring is damaged and water leakage replace seal water ring 2 Cylinder liner and body joint surface leak check cylinder liner shoulder and body Whether the interface between the two sides is smooth, the copper ring should be replaced with a replacement of 3 cylinder liners due to perforation and leakage of water to replace the new cylinder liner. Damaged cylinder head liner and water leak Replace liner 5 Defective water-cooled oil cooler core mixes cooling water and oil Detector oil cooler cartridge or replace 6 Cooling water in freshwater pump leaks into oil pan (1 ) Fresh water pump shaft and seal leakage at the beginning of the repair or replacement seal ring, grinding sealing surface (2) damage to the fresh water pump sealing water rubber band 7 body water cavity wall cavity erosion and leakage (especially by the push rod side cylinder wall) The etched hole can be carefully repaired or stuffed, but it must not damage the mating surface and deformation. If the corrosion is serious, replace the machine body. 8. The reason for the high temperature of the outlet water and its troubleshooting method No. Fault characteristics and causes Causes to remedy 1 There is air in the water pipe. : After starting the diesel engine, the outlet pipe does not have water or water, and the water temperature keeps rising. Loosen the thermometer connector on the outlet pipe and let air flow until the outlet water flows smoothly. Tighten the connectors in the water pipe. 2 Insufficient circulating water volume: Under high load, water outlet The temperature is too high, the oil temperature also rises. 9: Causes and remedies for failures of the outlet temperature too low. No. Features and cause of failure Remedy 1 In the open cycle, the water source goes directly to the diesel Add a mixing bucket 2 Thermostat opening and closing is not flexible or damaged Replacement 3 Ambient temperature is low, use load is low Increase the load properly 4 Water temperature meter indication is incorrect Check or replace 10: Cause and elimination of organic oil in the cooling water No. Fault Features AND CAUSE REASON REMEDY 1 Water-cooled oil cooler core damage Check or replace 11: Motor system components Common causes and remedies No. Symptom Characteristics and causes Remedy 1 Start motor does not rotate (1) Defective connection cable Clean And screw the connector (2) Bad brush contact Clean the commutator surface and replace the brush (3) Start the motor itself to short-circuit to find the short-circuit site After the repair (4) The battery is insufficiently charged or the capacity is too small to charge or increase the battery parallel Use, otherwise the new battery should be exchanged (5) Battery switch contacts are in poor contact Check switch contacts and sanding 2 Start motor idling No starting power (1) Brush, terminal head is in poor contact or remove clean surface, soldered Clamping or replacement (2) Wear of bearing sleeves for new (3) Short-circuit of field windings or armature windings to find short Road section repair (4) Battery switch contacts singeing, poor contact check switch contacts, and sanded (5) Battery is under-charged or capacity is too small, and line voltage drop of starter motor is too large to charge or update, increase Large wire cross-section or shortened length 3 Starting motor gear and flywheel ring gear top gear or starter motor gear cannot be retracted: (1) The starter is not parallel to the center of the flywheel ring gear Re-install the starter to eliminate the non-parallel image (2) Electromagnetic The switch contacts are burned together Check the switch contacts and level out the singeing bristles. 4 The start button is released and the motor continues to run: (1) The contacts and connection screws of the solenoid switch are burned and serviced (2) Start the motor adjusting screw Not adjusted properly Re-adjustment 5 The charging generator does not generate electricity or the current is very low: (1) Short-circuit or short-circuit of silicon diodes, field coils, rotor coils. Replacement and repair (2) The regulator regulation voltage is lower than the battery voltage regulation voltage to the specified value ( 3) Excitation circuit is open or short circuit is connected to the broken wire (4) The rubber band is worn or the tension is insufficient. Replace or adjust the tension (5) Charging ammeter Damage Replacement (6) Incorrect line inspection Check and correct incorrect line 6 Incorrect charging current (1) Carbon brush is dirty, worn or poorly contacted, carbon brush spring pressure is insufficient for surface cleaning, dries or replaces (2) Silicon Diode Loosening of the press-fitting unit and replacement of the heat sink assembly (3) Loss of internal components of the regulator or poor contact contact Reflow or sanding with No. 0 sanding (4) Loose rubber band Repositioning of tension (5) Line wiring Loosening of the head for maintenance Tightening 7 Excessive charge current, high voltage, generator heating (1) Short circuit of magnetic field wiring or short-circuit maintenance of magnetic field coil (2) Short circuit of rotor coil, rubbing with stator (3) Adjusting the voltage too high, Use a guillotine to remove the contact surface and readjust to the specified value. (4) Short circuit of the emitter and collector of the transistor regulator at the end of the power transistor. Replace the power tube (5) Short circuit or open circuit of the magnetizing coil in the vibrating voltage regulator and additional resistance burning. Bad repairs or replacements 8 Generator noise: (1) Loose or shattered bearing replacement (2) Check the rotor and stator for collisions, repair and adjust according to actual conditions (use锉刀锉去碰相surface) 9 The battery charge does not charge, can not output a large current and the pressure drop is very large, there is a white crystalline material on the electrode plate (lead sulfate) Overhaul or replace the battery 10 When the battery is charged, the temperature is too high, the voltage is low, The proportion is low. Bubbles at the end of charging to teach small or bubbles occur too late, indicating that the internal battery short circuit caused by the battery at the bottom of the precipitate caused by too many short-circuit, the battery can be discharged, the electrolyte is poured out, washed repeatedly with distilled water and then charged. For other reasons should be opened or replaced partitions, or sent to the factory for repair 12: Common faults and troubleshooting methods of fuel injection pump No. Fault characteristics and causes of the reasons to eliminate 1 Fuel injection pump is not fed: (1) No fuel tank Add diesel fuel in time (2) Inlet air in the fuel system Loosen drain screws such as injection pump, pump oil with hand pump, remove air (3) Obstruction of fuel filter or tubing Cleaning or replacing paper filter cartridge, cleaning of piping After blowing (4) Failure of the oil pump No oil supply Troubleshooting according to the troubleshooting method of the oil pump (5) Plunger coupler snapping Remove the plunger coupling for grinding or replacement (6) Out of the boom and plunger The joint face is badly sealed and remove the grinding, otherwise the replacement 2 oil supply uneven (1) there is air in the fuel line, discontinuous oil supply to remove the air by the hand pump (2) the oil valve spring breaks to replace (3) oil out Seat face wear grinding repair or replacement (4) Plunger spring breakage replacement (5) Impurities to block the plunger cleaning (6) Into the oil pressure is too small Check the oil pump inlet connector filter and fuel filter is clogged, Scheduled cleaning and maintenance (7) Ring gear loosely aligned with the factory mark Tightening screw 3 Insufficient oil delivery (1) Outlet valve fittings Oil leakage grinding Repair or replacement (2) Oil pump inlet fitting Filter or fuel filter obstructs Cleaning filter or cartridge (3) Plunger coupler worn out Replace with new plunger coupler (4) Oil pipe connector oil leakage Retightened or inspect 13: Common causes and remedies for governors No. Features and cause of failure Remedy 1 Unstable speed (Oil tanker) (1) Uneven oil supply to each sub-pump. Re-adjust the oil supply of each oil pump. (2) Clean, grind, or replace carbon in the spray nozzle orifice and drip oil. (3) Loosening or replacing gear pin. (4) The camshaft axial clearance is too large. Adjust to the specified clearance value. (5) Plunger spring or outlet valve spring is broken. Replace (6) Fly iron pin hole is worn loosely. Replace fly iron pin and bushing (7) Adjusting teeth The clearance between the lever and the adjustment gear is too large or there is a burr. Readjust the assembly or replace the spare part. (8) The adjustment lever or the throttle lever does not move flexibly. Repair or reassembly (9) Air in the fuel system Use hand pump to remove air (10 ) Flying iron Open or fly seat is not flexible after opening Inspection is correct (11) Improper adjustment of low speed Adjust low speed stabilizer or low speed limit screw 2 Calibrated speed is not reached (1) Permanent deformation of governor spring Replace (2) Fuel injection pump Insufficient oil is handled according to the troubleshooting method of the fuel pump (3) The handle is not pulled into position Check and adjust the handle mechanism 3 The minimum idle speed is not reached (1) The handle is not pushed to the end Check and adjust the handle mechanism (2) Adjust the rack (3) Slow adjustment or low speed limit screw is screwed in too much. Re-adjustment 4 Coaster: Speed ​​governor suddenly malfunctions, making the speed exceeds the specified speed by more than 110% (1) Speed High emergency emergency stop immediately. Stop the diesel engine by cutting off the fuel, stop the fuel inlet, or cut off the intake air. (2) Adjust the rack rod or the throttle stick to check the parts, remove the high-speed limit screw seal, and readjust the seal ( 3) Adjust the pinion lever and pull-rod connecting pin off to refit or replace (4) Pull-rod screw off to refit or replace (5) Adjust spring break Replace 13: Hand Common causes of failures and remedies No. Symptoms and causes of failure Remedy 1 Insufficient oil delivery: (1) Check valve wear or fracture repair or replacement (2) Piston wear replacement (3) Oil pipe fittings oil tightly re-tightened Repair (4) Inlet connection Filter obstruction Cleaning filter 2 Top rod oil leakage inspection 3 Piston stuck oil leakage removal Repair grinding 4 Hand pump oil leakage, leakage air removal Repair grinding 14: Injector common failure causes and Remedy No. Fault Characteristics and Causes of Remedy 1 Little or no fuel injection (1) Air is removed from the fuel system's oil circuit. Air is removed from the high pressure or low pressure tubing. (2) Injector fittings are worn or trimmed. Replace (3) The fuel supply to the fuel injection pump is not normal. Find out the cause of the problem by troubleshooting the fuel injection pump. (4) Oil leakage from the high pressure oil pipe Tighten the nuts and tubing that has cracks. Replace (5) Replace the fuel injectors with wear. Replace or grind. 2 Low fuel injection pressure (1) Loosen the adjusting screw and readjust it to the specified pressure and tighten the lock nut (2). Adjust the spring deformation or replace (3) The needle valve sticks to the cleaning or grinding (4) Spring seat ,mandrel Parts wear repair or replacement 3 Injection pressure is too high (1) Adjust the spring elasticity of the pressure regulator to readjust to the specified pressure and tighten the lock nut (2). The needle valve sticks to the cleaning or grinding (3) The spray hole is blocked and the spray is blocked. Hole or change nozzle (nozzle) 4 Injector leakage: (1) Replace the spring with a broken spring (2) Needle body grinding surface is damaged Replace (3) Needle valve is cut clean Grind or replace (4) Tight Cap change line replacement (5) Injector body plane wear repair or replacement 5 Insufficient fuel atomization: (1) Low injection pressure is adjusted to the specified pressure (2) The nozzle surface of the nozzle is damaged or burnt Replacement (3) Injector mating parts are cleaned with garbage. 6 Injection line (1) Spray hole plugged with 0.2-0.3MM diameter wire drip hole (2) Needle body seat surface worn out Replace new Needle Valve Body (3) Needle Valve Scratched and Cleaned or Replaced 7-Pin Valve Surface Burned or Bluish-Black (Derived Diesel Engine) Check the cooling system and be careful to replace the coupling. Do not overload the diesel engine for long periods of time. 15: Common exhaust gas turbocharger failure causes and remedies No. Features and cause of failure Solution 1 Diesel engine can not produce the required power (1) Bearing wear replacement (2) Compressor impeller and Swirl flow path contamination cleaning (3) Turbine inlet shell leak check seal, eliminate air leakage (4) Turbine, compressor impeller back and seal ring too much carbon to check the seal, eliminate air leakage phenomenon, disassembly , Cleaning 2 diesel engine exhaust smoke is not normal: (1) Exhaust smoke (air intake is insufficient) Cleaning the intake filter (2) Part of the compressor contaminated flow path to check the seal, eliminate leaks, cleaning Compressed air impeller 3 Exhaust emission of blue smoke (1) Elastic air seal ring loses elasticity or excessive wear Replace (2) Blockage of the return passage of the intermediate housing or pipe deformation Clean and check the deformation 4 Abnormal noise and vibration (1) Compressor surge The supercharger vibrates with large amplitude (compressor passage, serious contamination of the inlet pipe and turbine outlet passage is one of the causes of surge) Cleaning (2) Improper assembly ( The rotor or compressor rotor pushes the dynamic balance or the rotor and fixture rub against each other.) Dismantling check (3) Turbine impeller or compressor impeller blades are damaged by incoming foreign objects Replace and inspect the diesel engine's intake and exhaust system (4) Turbine shell deformation Rubbing occurs to identify the cause of deformation and eliminate it. (5) Foreign matter is present in the vaneless scroll passage. When the diesel engine is idling, abnormal noise can be heard. Check the cross section of the inspection passage and check the bearing of the diesel engine inlet and exhaust system. Bad and rotor rubbing (1) Lubricating oil is dirty and the oil pressure is too low or the oil circuit is blocked Check the lubrication system and clean the filter (2) Check the cause of the oil temperature is too high Reduce the oil stability (3) Turbine, gas pressure Machine rotor dynamic balance damage or improper assembly Dismantling check recalibration balance, the need to replace the rotor combination group, (4) Exhaust temperature is too high and supercharger super speed check diesel engine and exhaust pipe for serious air leakage, deformation obstruction, etc. Similarly, repair and cleaning (5) Deformation of the turbine shell to identify the cause of deformation and remove it

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