4-7-opredelenie-mesta-neispravnosti-proslushivaniem-shumy-v-motornom-otseke.html

4.7. Definition of a place of malfunction by listening – noise in a motor compartment

In the presence of the cold engine weak detonation noise from a motor compartment not necessarily should become the reason for anxiety. If the engine is heated-up, occurrence металлически rigid detonation and rolling noise, on the contrary, almost always testify to presence of serious defects. Most often such defects take place in шатунных bearings, less often they can appear in radical bearings of a cranked shaft. Defects in bearings is always full audit of the engine. If at you sensitive hearing, fortunately, defects of bearings can be found out at their initial stage. If it so sometimes enough to replace the loose leaf of the bearing of sliding corresponding шатунного or the radical bearing – the expert, certainly, will advise to you to carry considerable out repairs (polishing, нитрование, new installation of a cranked shaft and so forth) engine knots.

How to distinguish defects of the bearing

Spend out of movement acceleration of work of the engine to average turns and then sharply dump gas. If you hear then easy detonation noise (nak-nak-nak) and will notice this noise also at sharp acceleration, it is possible to send at once the engine in a special workshop. Such noise – a typical sign of defect шатунных bearings.

If you have ignored in the beginning noise (nak-nak-nak) through some kilometres can already be distributed rigid "shchelk-shchelk-shchelk": defect of the bearing has become aggravated, the bearing loose leaf has fused and with a high probability the cranked shaft is already damaged. About cheap repair it is possible to forget already – it is necessary to reconcile now to completely replaced engine or its some knots. If from krivoshipno-shatunnogo the mechanism rolling noise is audible uniform, raising synchronously with engine turns, the trouble has happened with radical bearings. At once stop engine work, and further it is necessary to spend diagnosing of damages to a workshop.

If you all the same longer wait with it there will be a new danger – it is necessary to start up all block of cylinders of the engine on a breakage: loose leaves of bearings "rotate" thus in places of placing of bearings and instantly result the block in unsuitable scrap iron. All it will demand repair expenses in size when your dealer cannot already offer the old block of cylinders as replacement any more.