QSK19 series engine noise diagnosis
\nNote: When troubleshooting for\u00a0engine\u00a0noise, the first to exclude the noise caused by the auxiliary device, such as by the air compressor and power take-generated, do not mistake these noise is the\u00a0engine\u00a0noise. Remove the auxiliary drive belt to eliminate the noise caused by these devices. Noise will be spread to those who have no problem with metal parts. Therefore, using the stethoscope will help determine the cause of the\u00a0engine\u00a0noise of the position.
\nIf you hear the noise with the crankshaft speed,\u00a0engine\u00a0speed changes, the noise may be related to the crankshaft, connecting rod, piston, the piston pin. If you hear the noise with the camshaft speed,\u00a0engine\u00a0speed changes in the half, the noise may be related to the valve gear components. Hand-held digital tachometer can help determine whether the noise to the crankshaft or camshaft speed of operation of the relevant parts.
\nThrough the single-cylinder\u00a0engine\u00a0noise sometimes found to lack the fire test. Reference “QSK19 series\u00a0engine\u00a0fault diagnosis and repair manual” in the steps 006-005. If the noise volume decrease or disappear, then the noise and the test on a single cylinder.
\nDetermine the source of noise is no fixed rule or test method.
\nDriven by the\u00a0engine\u00a0components and auxiliary equipment, such as gear-driven fan clutch, hydraulic pump, belt-driven charger, air conditioning compressors and turbochargers are likely to cause\u00a0engine\u00a0noise. The following information can be used to guide diagnosis\u00a0engine\u00a0noise:
\nMain bearing noise
\nMove the spindle Poisson noise can be generated by percussion with a load on the\u00a0engine\u00a0was heard, the sound of its large and dull. If all of the main bearings are all loose, you will hear a loud and short percussion sound. This is a pattern of percussion sound and with the speed change. When the\u00a0engine\u00a0load or drag heavy traffic, this is most loud noise. This rod knocking sound noise generated than dull. Low oil pressure will also produce with this situation.
\nIf the bearing is not loose enough to produce their own separate percussion sounds, if the oil is too thin or no bearing on the oil, bush will produce percussion noise.
\nAn irregular noise may indicate worn crankshaft thrust bearing.
\nIntermittent sharp knocking sound that the crankshaft axial clearance is too large. Repeat clutch clutch action may cause changes in the noise.
\nConnecting rod bearing noise
\nExcessive clearance in connecting rod can cause a variety of\u00a0engine\u00a0speed conditions, that is idle and load conditions of the percussion noise. When the bush began to loose, the noise may be related to piston slap or loose piston pin noise mixing. The volume of noise increases with\u00a0engine\u00a0speed. Oil pressure is too low will produce this situation.
\nPiston noise
\nDifficult to distinguish between piston pin, connecting rod and piston noise caused by the difference between. Caused by loose piston pin double-click percussion sound, usually you can hear the\u00a0engine\u00a0idling. When the noise of the cylinder of the injector to stop fuel injection, this percussion sounds obvious change will occur. However, in some\u00a0engines, when the vehicle is at a steady speed when driving on the road, the percussion sound becomes more apparent.<\/p>","protected":false},"excerpt":{"rendered":"
QSK19 series engine noise diagnosis Note: When troubleshooting for\u00a0engine\u00a0noise, the first to exclude the noise caused by the auxiliary device, such as by the air compressor and power take-generated, do not mistake these noise is the\u00a0engine\u00a0noise. Remove the auxiliary drive belt to eliminate the noise caused by these devices. Noise will be spread to those […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2398","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":[],"yoast_head":"\n