Of car noise differentiate a method:
In real work, because accept working requirement limit, the noise of the car uses special apparatus very hard to undertake metrical, in can using daily life only, to audio judgement undertakes describe and be comparatived to the noise of the car. For example bearing does attrition to give out " clang clang " sound, what spiracle clearance gives out greatly too is similar of floor of cement of little weight tat " Da Da " sound.
1, correct divisional and normal sound and blame are normal noise.
When the car is working, each orgnaization puts the vibration that be in, can give out the noise of a variety of property, but noise does not state the car has trouble, to avoid to disassemble needlessly, must distinguish above all normal sound and blame are normal noise. The normal and oscillatory sound of each system component (the noise) that is like engine surface, the concussion sound of the gear when shifting gear, make the sound taking energy of life of working source, exhaust reputation with gas, noise of gear clench the teeth all belong to normal sound. Be not normal sound (abnormal knocking) the influence that presses pair of car function can be divided for slight noise, general noise and malign noise. Slight noise, bearing of the flash over sound that is like high-pressured report leakage of electricity, scroll is slight Song Kuang's noise, average volume is minor, parts wears away rate is not old, do not have marked change more for long, this kind of breakdown not via repairing still the normal travel of tenability car.
2, general noise, be like flywheel bearing noise, clutch release shaft bear noise, have distinct effect to car function, but short-term inside still tenability its are main specifications.
This kind of noise is general volume is larger, parts wears away bigger also, answer to be repaired in time. If appear,be in in travel road this kind of noise, but of short duration does not make processing. Malign noise, if crankshaft bearing, connecting rod bearing is serious hair is noisy, accompany lube pressure drops, the gear clash with remarkable transmission, poor fast implement intense and oscillatory sound, have serious effect to the car, be about to cause or had caused the serious damage of parts. This kind of breakdown must cause height to take seriously, should jockey instantly examination, can go constrainedly anything but sail, otherwise, cause great and mechanical accident extremely easily.
3, when diagnosing car abnormal knocking, should notice to create good auscultatory condition, try to remove the interference of other noise, lest affect the accuracy of judgement.
Can magnify sound conciously or had better narrow, although use come back provide or other metal lever make auscultatory and implemental contact send noisy place to magnify noise, or the means that uses one-cylinder to snap fire reduces noise, break need in order to get used to examine. Auscultatory spot should keep quiet, reduce the interference of factitious element as far as possible.
Catch, let us treat specific condition together:
1, engine abnormal knocking
Cold car abnormal knocking: Cold car is worn the car often hears to be transmitted in engine cabin " Da Da " abnormal knocking, and disappear after hot car. Because car place time is too long,this is, engine oil is main the carapace end regurgitate oil, when cold start-up engine oil cannot form effective oil film, cannot build significant oil pressure, no matter be the slight clash that hydraulic pressure holds out column or mechanical rocking arm can produce a metal,this is.
Heat up car abnormal knocking: When hot car occurrence abnormal knocking, car advocate need notices highly. Hot car abnormal knocking is general and bad to judge the place, need technology eliminates, should not appear in the engine when abnormal knocking only when faint, tail gas is hoar and nigrescent, the issue is relatively small, can remove the issue inside the crock. General leather belt skids or ageing also can appear abnormal knocking, when sound of occurrence metal knock, car advocate should write car plant self-criticism in time.
Engine fender abnormal knocking
Screw often can produce displacement on the car that often moves, if often hear what give out into gas grille position " bang bang " abnormal knocking, besides grille the likelihood becomes loose outside, car advocate still should check engine fender screw to whether become loose, whether do engine fender and negative happen become loose. Besides close solid screw, still can fill up chipboard in abnormal knocking place kind article, can eliminate abnormal knocking easily.
2, brake abnormal knocking
This is commonner, after raining especially. Abnormal knocking expression is given out to step on the meeting when brake pedal " Zhi Zhi " metallic attrition sound, this kind of circumstance is undercarriage of Buddhist templeput on the brakes more rusty, brake piece inside have good thing or be brake piece wear away serious. General processing method is to step on a few foot brake suddenly to look to whether alleviate, undercarriage of Buddhist templeput on the brakes is checked later piece.
3, pensile abnormal knocking, cough up toes step on 9 times of click
Encounter jolt give out near 4 wheel " Dong Dong " or " Ka Ca " sound, it is pensile perhaps component shakes shock absorber question likely cause, arrive to maintain inn normally certainly please microscope.
Concern moderately with taken a surname not only because of pensile component, return a thing to involve security of drive a vehicle, never small inspect.
4, gear-box abnormal knocking, the noise of the rustle when putting into gear rose
If gear-box interior has,the car is in in travel " rustle " sound, and after stepping on next clutch, disappear again, explain noise origin is gear-box breakdown, it is gear-box bearing or gear wear away likely, bearing stain be caused by.
5, tire abnormal knocking
Tire abnormal knocking namely the fetal a confusion of voices that everybody says, only car travel can appear to the ability when fixed rate. The generation of fetal a confusion of voices has a lot of kinds of circumstances to include, sort of travelling speed, tire, embryo presses circumstance and road surface circumstance to wait. A little new car also can produce fetal a confusion of voices below fixed rate, this matters with respect to the brand that follows tire. Had filled commonly fetal tire is more incidental phenomenon of fetal a confusion of voices, nail is plunged into to also can cause abnormal knocking above tire, and what listen inside the car is very clear.
6, automobile body abnormal knocking
Driving there always is automobile body when step on the gas or brake a few abnormal knocking of some place, voice is not big, and also be not affected drive normally, but always letting a person have a bit concern was where to give trouble. Appear because automobile body stiffness is insufficient,this problem is normally, bring about car to produce deformation in travel, door and car casing chafe or shake, or some places are sealing off and the attrition between generation armor plate. The wind noise that still has a few cars is bigger, on certain level the modelling of this and car is concerned, secure between the automobile body part that still has a few cars bad to cause abnormal knocking possibly also, go up closely commonly screw can be solved.
7, component shakes abnormal knocking
If road of drive a vehicle is medium, give out the sound that similar bee gives out when automobile body, probable it is some component becomes loose, of engine bottom plastic or metallic component reachs air conditioning or the fixed bracket of compressor becomes loose most common.
