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Automobile crankshaft bearing abnormal motion
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Representation:
1) There is no movement when the engine is working normally under normal conditions; when the engine working speed changes suddenly, the "é•—é•—" knocking sound is announced; together with the oscillating appearance.
2) When the engine load changes; the sound is loud. The higher the speed; the louder the sound. The louder the sound is not good; the quality of the bearing is still very good today; especially the Swedish SKF bearing quality is the best; but There will also be some difficulties; so we also need to pay attention to it; some SKF car crankshaft bearings will also show abnormal movements; so we need to pay attention to the bottom of the problem; many cars will encounter such a situation when driving; It doesn't matter at all; it is very troublesome; people who drive a car usually need to know some common sense of machinery; even some common bearing common sense.
3) The single cylinder “breaks the fire†and does not feel the change; when the adjacent two cylinders are broken together, the sound will be significantly weakened.
reason:
1) The cooperation gap between the crankshaft and the journal is too large.
2) The crankshaft and axial clearance are too large.
3) The crankshaft SKF bearing cap bolt is loose.
4) The smooth bearing of the SKF bearing and the journal of the crankshaft caused the SKF bearing alloy to ablate and fall.
5) The crankshaft is bent and deformed; the crankshaft journal is out of round.
6) Relative transformation of crankshaft SKF bearing and SKF bearing housing.
Confirmed diagnosis:
1) Dynamic and static from the lower part of the cylinder close to the crankcase. The oil pressure is significantly reduced. The engine vibrates the throttle at low and medium speeds; announces a significant and boring series of knocking sounds accompanied by engine oscillations.
2) High-speed working engine; the body oscillates a lot; the oil pressure is significantly reduced; the SKF bearing and the journal clearance are too large or the SKF bearing alloy is ablated and dropped.
3) The single-cylinder fire-breaking experiment has little change in motion and static; while the dynamics and statics of the two adjacent cylinders are significantly weakened or not seen when they are broken; the crankshaft SKF bearing between the two cylinders is ringing.
4) The speed is not high, but the body oscillates more; there is a rocking and shaking appearance; together, the heavy and large "嘣嘣" knocking sound is announced to crack the crankshaft.
5) The movement increases with the increase of temperature; when it is high speed, the movement becomes messy; it may be the crankshaft twist.
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