Carterpillar excavator, engine 30 cases Classic fault case, reason analysis
Carterpillar excavator, engine 30 cases Classic fault case, reason analysis
An engine is a machine that can convert other forms of energy into mechanical energy, including, for example, an internal combustion engine (gasoline engine, etc.), an external combustion engine (Stirling engine, steam engine, etc.), an electric motor, and the like. For example, internal combustion engines usually convert chemical energy into mechanical energy. The parts that includs piston, piston ring, cylinder block, cylinder head, gasket kit, engine connecting rod, crankshaft, injector, turbocharger, starter motor, pressure sensor,oil pump, ecm, exhaust manifold, v ribbed belt, bushing, engine valve and so on.There are many cases happen to engine, for wonepart we have experience of engine repair and rebuild projects, if your engine have the following problems, then you will check the following reasons as reference:
1. When the start switch is engaged, the engine crankshaft will not rotate
Possible reason
• Battery output is too low
• Defective wire or switch
• The electromagnetic switch of the starting motor is faulty
• The starting motor is faulty
• Intrinsic problems affecting the rotation of the engine crankshaft
2. Start the motor crank, but the engine cannot start
Possible reason
• No fuel in the fuel tank
• Poor fuel quality
• The fuel filter is dirty
• The fuel pipe is dirty or damaged
• Low fuel pressure
• There is air in the fuel system
• The fuel system and engine are not at the correct timing
• The exhaust valve is always open (the fuel does not have high enough pressure to start the engine)
• Turning speed is too low
• No fuel in the fuel injection pump housing
3. The engine lacks fire or runs violently
Possible reason
• Low fuel pressure
• Fuel system has air
• Fuel pipe leaks or breaks between fuel injection pump and fuel injector
• Incorrect valve clearance
• Faulty fuel nozzle
• Fuel injection timing is wrong
• Putting rod bent or broken
• Worn valve seat or valve mating surface
Fourth, the engine stalls at low speed
Possible reason
• Low fuel pressure
• No-load speed (idle speed) is too low
• Faulty fuel nozzle
• Incorrect valve clearance
5. Sudden changes in engine speed
Possible reason
• Fuel system has air
• The governor lever cannot move freely
• The governor hydraulic booster orifice fails
6. Insufficient power
Possible reason
• Poor fuel quality
• Low fuel pressure
• There is air in the fuel system
• The air intake system is full of leaks
• Incorrect fuel setting
• Governor lever
• Incorrect valve clearance adjustment
• Faulty fuel nozzle
• Fuel injection timing is wrong
• Turbocharger carbon deposition
7. Excessive vibration
Possible reason
• Loose nuts fixing the pulley
• The pulley is defective
• The engine support is loose, worn or defective
• Lack of fire or rough operation
• Unbalanced fan blades
• Torsion shock absorber damage
8. Combustion noise
Possible reason
• Poor fuel quality
• Faulty fuel nozzle
• Fuel injection timing is wrong
Nine, the valve chamber is noisy (Kata sound)
Possible reason
• Broken valve spring or lock clip
• Loose bolts fixing the rocker shaft bracket
• Valve clearance is too large
• Insufficient lubrication
10. Organic oil in the cooling system
Possible reason
• Malfunction of oil cooler core
• Cylinder head gasket failure
• Cracks in cylinder block and cylinder head (replacement)
11. The engine has knocking sound
Possible reason
• Damaged connecting rod bearing
• Damaged crankshaft
• Damaged timing gear
• Fuel dilution crankcase oil
12. Fuel consumption is too high
Possible reason
• Fuel system leak
• Fuel combustion noise (knock on cylinder)
• Fuel injection timing is wrong
• Fuel is set too high
13. The valve or valve transmission mechanism is noisy
Possible reason
• Broken valve spring
• Camshaft broken
• The valve tappet is damaged
• Damaged valve
14. Rocker arm displacement is small and valve clearance is too large
Possible reason
• Insufficient lubrication
• Rocker arm parts wear
• Valve stem end wear
• Valve clearance is too large
• Push rod wear
• Tappet wear
• Camshaft extraction cam wear
• Loose bolts securing rocker arm
15. Broken valve lock pin or spring
Possible reason
• Valve lock pin failure
• Broken valve spring
16. Exhaust Organic Oil
Possible reason
• Too much oil in the valve chamber
• Worn valve guide
• Piston ring wear
• The turbocharger leak seal is damaged
• Air filter element clogged
17. The valve clearance is small or none
Possible reason
• Worn valve seat or valve contact surface
18. Premature engine wear
Possible reason
• There is dirt in the lubricant
• Air inlet leak
• Fuel leaks into the lubricant
Nineteen, there is coolant in the lubricant
Possible reason
• Damaged oil cooler core
• Damaged cylinder head gasket
• Cracked or damaged cylinder head
• Cracked or damaged cylinder
• Leakage of cylinder liner seal
• Crack in cylinder liner
Twenty, black smoke or gray smoke from the exhaust pipe
Possible reason
• Insufficient combustion air
• Damaged fuel nozzle
• Fuel injection timing is wrong
21. The exhaust temperature is too high
Possible reason
• Air inlet or exhaust system is not smooth
• Fuel injection timing is wrong
• Air intake system leaks
• Exhaust system leakage
22. Exhaust emits white smoke or blue smoke
Possible reason
• The oil level of the crankcase is too high
• Engine misfire or rough operation
• Fuel injection timing is wrong
• Worn valve guide
• Piston ring wear
• Damaged turbocharger oil seal
23. Low engine oil pressure
Possible reason
• Damaged oil pressure gauge
• Low viscosity of lubricant (diluted by diesel)
• Damaged suction pipe of oil pump
• Damaged oil pump
• The gap between crankshaft and crankshaft bearing is too large
• The gap between camshaft and camshaft bearing is too large
• Intermediate gear bearing clearance is too large
• Dirty oil filter or oil cooler
• Oil pump safety valve stuck
24. Large engine oil consumption
Possible reason
• Too much oil in the engine
• Oil leakage
• The oil temperature is too high
• Too much oil in intake duct
• Worn valve guide
• Piston ring wear
• Damaged turbocharger oil seal
25. The engine coolant temperature is too high
Possible reason
• Air is not smooth through radiator or coolant flow through radiator
• Insufficient coolant in the system
• Combustion gas in the coolant
• Malfunction of coolant thermostat or thermometer
• Damaged water pump
• Engine overload
• The coolant level is too low
Twenty-six, starter motor does not rotate
Possible reason
• Battery output is too low
• Damaged wire or switch
• Starting motor does not rotate
• Faulty starter motor
27. The alternator does not charge
Possible reason
• Alternator drive belt loose
• The charging or ground circuit or battery connector is faulty
• The alternator brush is damaged
• The rotor (excitation coil) is damaged
28. The alternator charging rate is low or abnormal
Possible reason
• Alternator drive belt loose
• The charging or ground circuit or battery connector is faulty
• The alternator voltage regulator is damaged
• The alternator brush is damaged
• Damaged rectifier diode
• The rotor (excitation coil) is damaged
29. The alternator charging rate is too high
Possible reason
• Loose connection of alternator or generator regulator
• The alternator voltage regulator is damaged
30. The alternator is noisy
Possible reason
• The alternator drive belt is worn or damaged
• Loose alternator pulley
• Alternator drive belt and drive pulley are not aligned
• Alternator bearing wear
• Bent armature or rotor shaft
• Alternator rectifier short circuit
31. Engine Speed
1. Engine oil enters the cylinder to participate in combustion
(1) Too much oil is added to the oil pan
(2) Diesel oil leaks into the oil bottom (the oil level rises and the mixed oil enters the combustion chamber)
(3) The temperature of the diesel engine is too high, so that the engine oil is too lean, easy to enter the cylinder to participate in combustion
2. Diesel oversupply
(1) Possible reasons for governor
(2) Excess fuel supply caused by fuel injector quality problems
The parts that includs piston, piston ring, cylinder block, cylinder head, gasket kit, engine connecting rod, crankshaft, injector, turbocharger, starter motor, pressure sensor,oil pump, ecm, exhaust manifold, v ribbed belt, bushing, engine valve and so on. If you have any enquiry or order for the engine spare parts, pls feel free to email info@wonepart.com or whatsapp:+86-15860751932.
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