Daewoo Nexia

Since 1994 of release

Repair and car operation

2.46.2. Diagnostics of malfunctions on noise and knocks

THE GENERAL DATA

The raised noise of the mechanism timing

– Low pressure of oil. To make necessary repair.
– Easing of fastening of the details set in motion by a camshaft. To check up and eliminate malfunction.
– Deterioration of the details set in motion by a camshaft.
– Breakage клапанной springs.
– Jamming of cores of valves.
– Deterioration, pollution or malfunction of a drive of valves. To check up, clear, if necessary to replace details.
– Deterioration or bad processing of a camshaft. To replace a shaft.
– Deterioration of directing plugs of valves.

Knocks on the cold engine are audible within 2-3 minutes after start, knocks increase at twisting moment increase

– Knock of valve EFE with a vacuum drive. To replace valve EFE.
– The flywheel touches a casing. To rectify casing situation.
– Fastening easing damperа fluctuations or pulleys. To tighten fastening or to replace if necessary.
– The increased backlashes between pistons and cylinders. To replace pistons. Knocks of pistons on the cold engine usually disappear after short circuit on weight of a candle of the corresponding cylinder. Knock of pistons on the cold engine, I vanish щий in one and a half minute after start, it is considered the normal phenomenon.
– A rod bend.

Strong knocks on the heated-up engine at twisting moment increase

– Breakage damperа fluctuations or a pulley nave. To replace faulty details.
– Easing of fixing bolts of the hydrotransformer.
– Belts of a drive of auxiliary units or a crack on belts are drawn. To adjust a tension of belts or to replace faulty belts.
– Zadevanie of elements of final system for the bottom. If necessary to restore a correct arrangement of knots of final system.
– A crack in a flywheel.
– The increased backlashes in radical bearings. To replace loose leaves if necessary.
– The increased backlashes in шатунных bearings. To replace loose leaves if necessary.

Weak knocks on the heated-up engine

– A detonation. To check up an electronic regulator of an advancing of ignition. To check up a corner of an advancing of ignition and quality of fuel.
– Easing of fixing bolts of the hydrotransformer.
– Thinnesses in interfaces of system of release of the fulfilled gases. To tighten bolts and-or to replace a lining.
– The increased backlashes in шатунных bearings. To replace loose leaves if necessary.

Short-term knocks right after engine start

– Mechanical noise of the fuel pump. To replace the pump.
– Application of unrecommended engine oil. To replace oil. It is necessary to use the engine oil which viscosity corresponds to prevailing service conditions of the car (a range of temperatures of air).
– Malfunction of hydraulic pushers of valves. To clear, check up and replace if necessary. At останов ке the engine some valves remain opened and under action клапанной springs oil is squeezed out from pushers. To replace pushers follows only at обнаруже нии to their malfunction.
– The increased axial backlash of a cranked shaft. To replace the persistent bearing of a shaft.
– The increased backlash in the forward radical bearing. To replace the worn out details.

Knocks on the heated-up engine idling

– Easing of a tension or deterioration приводных belts. To adjust a tension or to replace if necessary.
– Deterioration of bearings of the compressor of the conditioner or the generator. To replace faulty bearings.
– Mechanical noise of the fuel pump. To replace the pump.
– Noise of details of the mechanism timing. To replace faulty details.
– Application of unrecommended engine oil. To replace oil. It is necessary to use the engine oil which viscosity corresponds to prevailing service conditions of the car.
– The increased backlashes between fingers and pistons. To replace pistons and fingers.
– A deviation from соосности apertures in rod heads. To check up rods and to replace faulty details.
– Insufficient backlashes between pistons and cylinders. Хонинговать cylinders and to establish the complete set of new pistons.
– Fastening easing damperа fluctuations. To tighten fastening or to replace the worn out details.
– Wrong displacement of a piston finger. To rearrange the piston.