sign | Probable Cause | Elimination Method |
Low compression in the engine cylinders | Broken cylinder head gasket | Replace gasket |
Worn or damaged piston rings | Replace rings | |
Worn piston or cylinder | Repair or replace piston and/or cylinder block | |
Worn or damaged valve seat | Repair or replace valve seat and/or valve | |
Low oil pressure | Low engine oil level | Check engine oil level |
Faulty oil pressure sensor | Replace oil pressure sensor | |
Oil filter dirty | oil filter | |
Worn oil pump gears or cover | Replace oil pump or cap | |
Liquid motor oil | Change engine oil | |
Safety valve open | Repair safety valve | |
Increased bearing clearances | Replace bearing shells | |
High oil pressure | Safety valve closed | Repair safety valve |
Engine vibration | Engine mounts loose (front and back) | Torque motor mounts |
Transmission bracket not tightened | Torque tighten the gearbox mounting bracket | |
Underframe bracket not tightened | Torque tighten the subframe bracket | |
Center support not tightened | Torque tighten the center support | |
Gearbox mount damaged | Replace transmission mount | |
Damaged underframe support | Replace subframe support | |
Support shaft damaged | Replace support shaft | |
Valve noise | Liquid motor oil | Change engine oil |
Worn or damaged valve stem or valve guide | Replace valves or valve guides | |
The performance of hydraulic valve clearance compensators is impaired | Check oil passages or replace hydraulic valve clearance compensators | |
Knocking in the connecting rod or main bearings of the crankshaft | Insufficient oil supply | Check engine oil level |
Liquid motor oil | Change engine oil | |
Increased bearing clearance | Replace bearing shells | |
Noise emitted by the toothed belt | Incorrect toothed belt tension | Adjust toothed belt tension |
Low coolant level | Coolant leak from: 1.Heater or radiator hose | Repair or replace damaged parts |
2. Faulty radiator cap | Tighten or replace radiator cap | |
3. Thermostat housing | Replace gasket or shroud | |
4. Radiator | Repair or replace | |
5. Water pump | Replace water pump | |
Contaminated radiator pipes | Foreign matter in the coolant | Replace coolant |
High coolant temperature | Faulty thermostat | Replace thermostat |
Faulty radiator cap | Replace Radiator Cap | |
Clogged channels or hoses of the cooling system | Replace or clean clogged cooling system components | |
Loose or broken drive belt | Adjust tension or replace drive belt | |
Faulty water pump | Replace water pump | |
Faulty coolant temperature sensor | Replace coolant temperature sensor | |
Faulty electric radiator fan | Replace or repair the radiator fan | |
Not enough coolant | Add coolant | |
Low coolant temperature | Faulty thermostat | Replace thermostat |
Faulty coolant temperature sensor | Replace coolant temperature sensor | |
Leaks from the engine oil cooling system | Loose connections | Tighten connections |
Damaged hoses, pipes or oil cooler | Replace or repair hoses, pipes or oil cooler | |
Electric radiator fan not working | Damaged: temperature sensor, electric motor, fan relay or electrical wires | Replace or repair damaged items |
Exhaust gas leaks | Loose connections | Tighten connections |
Damaged pipe or muffler | Replace or repair pipe or muffler | |
Extraneous noise from the exhaust system | Muffler baffle damaged | Replace muffler |
Damaged rubber support | Replace rubber mount | |
Pipe or muffler is in contact with the body | Adjust the position of the exhaust system | |
Damaged pipe or muffler | Replace or repair pipe or muffler |