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