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MOSKVICH-412

Сайт для инженеров и механиков

Check of the engine noise and knocks

As the noise of operation in certain skill can be judged technical condition of the engine. At the hearing can be identified Increased clearance of mating parts, the random breakage and, finally, the weakening of fasteners individual nodes. Increased clearance of connecting rod bearings, crankshaft and indigenous shaft and the bearing of a camshaft, pistons, and between cylinders, and valves between the adjusting screws rockers, as well as extended chain cause each separately its own specific beat. And if relatively difficult to detect increased noise or any sound of the engine, then define knock and the specific location of damaged coupling details can be only an experienced mechanic, with the necessary skills in recognition of these defects. Basic instructions on how to listen to the engine by means of stethoscope given in Table 1, as shown in Figure 5 conditionally located on the front surfaces of the engine area listening (1-5). Moskvich-412 Table 1 -------------------------------------------------- --------------- Location of possible knock .................< b> Bearings Crankshaft Thermal state Warm up the engine ................. Mode Engine ................. sharp change Place (Zone listening see Fig. 5) .............. At the bottom of the cylinder Nature knock ..................... deaf, low-pitched Conclusion the possibility of further By operation .............. use is not permitted, required repairs Possible effects operation with unresolved Destruction banging .................... antifriction layer bearings -------------------------------------------------- --------------- Location of possible knock ....................< b> Connecting rod bearings Thermal state Warm up the engine ................. Mode Engine ................. sharp change Place (Zone listening see Fig. 5) .............. cylinder block through movement of the piston in areas of the upper and lower position and the piston pin Crank (Zone 2) Nature knock knock ..................... mid-tone (ringing more than knocking main bearings) Conclusion the possibility of further By operation .............. use is not permitted, required repairs Possible effects operation with unresolved Destruction banging .................... antifriction layer bearings and education ellipticity of the connecting rod journals crankshaft Shaft -------------------------------------------------- --------------- Location of possible knock ....................< b> Piston and cylinder Thermal state A cold engine ................. Mode Small Engine ................. engine speed the engine idling Place (Zone listening see Fig. 5) .............. At the top of the block cylinders (Zone 2) Nature knock knock ..................... Dry snapping, growing at Change the speed cranked the motor shaft. At the sound of heavy wear listening also to the heated engine Conclusion the possibility of further manual operation is allowed to .............. Possible effects operation with unresolved knock .................... In some cases, the cost increases Oil -------------------------------------------------- --------------- Location of possible knock ....................< b> Valves and valve seats Thermal state Warm up the engine ................. Mode Small Engine ................. engine speed the engine idling Place (Zone listening see Fig. 5) .............. lateral surface of the cylinder head (Zone 3) Nature knock knock ..................... Distinct ringing Conclusion the possibility of further operation .............. use to be permitted. Adjust the clearances should be, if the sound will be enhanced and clearly bugged without a stethoscope Possible effects operation with unresolved knock .................... Enhanced wear saddles and heads Valve -------------------------------------------------- --------------- Location of possible knock ....................< b> Bearings Distribution Shaft Thermal state Warm up the engine ................. Mode Small Engine ................. engine speed the engine idling Place (Zone listening see Fig. 5) .............. On the walls of the head cover in place location of bearings camshaft (Zone 4) Nature The distinct sound of a knock ..................... Conclusion the possibility of further operation .............. use to be permitted. Possible effects operation with unresolved knock .................... Rexinforced bearing wear Camshaft -------------------------------------------------- --------------- Location of possible knock ....................< b> Chain Drive Timing Thermal state Warm up the engine ................. Mode Small Engine ................. engine speed the engine idling Place (Zone listening see Fig. 5) .............. In the area of ??distribution covers Stars (5 zone) Nature The distinct sound of a knock ..................... disappearing from increase in speed crankshaft of the engine Conclusion the possibility of further operation .............. use to be permitted. Possible effects operation with unresolved knock .................... Enhanced wear chain sprockets and -------------------------------------------------- ---------------
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