If there are noises and knocks in a running engine, you should find out the cause of their occurrence and do not operate the engine until the malfunction is eliminated

In a cold engine, after starting, knocking of valve lifters and hydraulic tensioners may occur.

As the engine warms up to operating temperature, but no more than after 30 minutes, knocking should disappear.

  • 2. Do not overheat the engine. If the coolant overheat warning light comes on, immediately stop the engine, identify and eliminate the cause of overheating.
  • 3. Do not operate the engine with the emergency oil pressure warning light on.

This will lead to scuffing of the bearings of the crankshaft, camshaft and failure of the gas distribution mechanism.

Illumination of the signaling device is allowed when the engine is running at the minimum speed in idling mode and during heavy braking.

  • 4. Do not operate the engine with the diagnostic lamp on.

The constant burning of the lamp indicates the presence of malfunctions in the engine control system. It is necessary to diagnose the system and fix the problem as soon as possible.

Examples of possible causes of engine failure

- 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

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