During the operation of the engine, some malfunctions may occur:
- - engine does not start;
- - the engine is unstable;
- - high or low idle speed of the crankshaft;
- - increased toxicity of exhaust gases.
Let's consider the causes and methods of correcting these defects and some others.
- Cause of malfunction
Remedy
Engine won't start:
- Fuel supply interrupted
Check fuel pump fuse
- fuel pump does not work
Check the condition of the contacts in the connections of the pump, pump relay and start relay
- broken valve timing
Restore phases at the service station
- the pressure reducing valve of the fuel system has failed
Replace valve
- clogged fuel filter
Replace filter
Faulty ignition system:
- broken contact in the circuits of the ignition coils and the control unit
Restore contact
- ignition coil failed
Replace coil
Engine running erratically:
- Water intrusion into the fuel tank
Drain the sludge from the tank
- Air leakage through leaks in the intake system, crankcase ventilation or idle speed control
Fix leaks in joints
Interruptions or failure of one of the cylinders:
- carbon deposits on a candle or failure of a candle
Clean carbon deposits or replace spark plug
- the contact of the nozzle is broken or the nozzle is out of order
Restore contact or replace nozzle
- spark plug tip broken
Replace Tip
- faulty control unit
Replace Block
Interruptions or failure of two cylinders:
- faulty ignition coil
Replace coil
- faulty control unit
Replace block
High idle speed with warm engine:
- Leakage in the hose connections of the crankcase ventilation system and the idle speed controller
Fix leaks in joints
- The contact of the idle speed regulator is broken or the regulator is out of order
Restore contact or replace regulator
- The contact of the sensors of the engine management system is broken or the sensors fail
Restore contact or replace faulty sensors
Increased toxicity of exhaust gases:
- CO adjustment is broken
Adjust the CO content with the adjusting screw on the mass air flow sensor
- The tightness of the valves is broken
Lap the valves
- Worn oil seals
Replace caps
- The contact of the coolant temperature sensor is broken or the sensor is out of order
Restore contact or replace sensor
- CO adjustment is broken
Adjust the CO content with the adjusting screw on the mass air flow sensor
- The tightness of the valves is broken
Lap the valves
- Worn oil seals
Replace caps
- The contact of the coolant temperature sensor is broken or the sensor is out of order
Restore contact or replace sensor
- Wear of parts of the cylinder-piston group
Repair the engine
Engine not developing full power:
- Air filter dirty
Replace filter element
- Clogged fuel filter
Replace filter
- Air throttle not opening fully
Adjust damper actuator
- Decreased performance of the fuel pump
Replace pump
Engine overheating:
- The tension of the water pump and generator drive belt has loosened
Adjust belt tension
- Faulty thermostat
Replace thermostat
- Insufficient amount of fluid in the engine cooling system
Add coolant
- Severe contamination of the radiator
Rinse the radiator with a jet of water
- Faulty electric fan
Check fan motor, sensor and relay. Replace defective nodes
- Faulty water pump
Replace pump
Lower oil pressure:
- Malfunction or clogging of the oil pump pressure reducing valve
Rinse valve parts or replace defective parts
- Engine overheating
Remove the cause of overheating
- Wear of oil pump parts
Replace pump
- Wear of the main bearing shells
Replace Earbuds
Increased oil consumption:
- Worn or coked piston rings
Repair the engine
- The crankcase ventilation system is broken
Rinse system parts
- Worn oil seals
Replace caps
- Oil leakage through gaskets and seals
Fix the leak, if necessary, replace the seals
Knock - in the engine:
- The hydraulic pusher is out of order
Replace hydraulic tappet
- The hydraulic chain tensioner is out of order
Replace hydraulic tensioner
- Worn connecting rod and piston group
Repair the engine
- Worn chain tensioner shoe
Replace shoe
