" steam compiles a data " the symptom with car bad water pump and reason!

1, water pump attaint will be refrigerative circular ability is abate do not circulate even, meeting occurrence cooling fluid " boil " phenomenon.

2, engine stands by water pump place slack. Leakage cooling fluid can leave the mark of cooling fluid color on water pump airway, bring about those who lack the symptom such as Wen Gao of the water after cooling fluid to appear.

3, occurrence abnormal knocking of the water pump when engine works.

Because interior has a foreign body,water pump occurrence abnormal knocking may be, or bearing wears away cause.

Examine the mechanical failure that whether is water pump oneself next, common cause has: Filling too close or between impeller and pump housing by sundry card lives and jam the; pump shaft, bearing, annulus that decrease leakage becomes rusty; pump shaft bends badly etc. Eliminate a method: Loosen filling, ; of chamfer of dredge pilot a ship into a harbour ravels the cleared and sundry, ; that divide rust tears open pump housing next pump shaft corrective or change new pump shaft.

It is, water Wen Gao, after the condition that removes other reason, can judge the issue that is water pump.

2 it is to see the liquid flow inside the cistern when cheering, when cheering the door, water can have flow, this explains water pump does not have a problem

3 be, the exterior sees water pump have without slack, and the abnormal knocking that listens to water pump to do not have.

The action of water pump is to pass pair of cooling fluid to undertake pressurization, the loop in making sure its are fastened in refrigeration flows, quicken caloric to send out. As the device of a long-term movement, in use process, water pump also can appear of breakdown. Judgement car water pump is bad, because observe whether cistern lacks water first (be sure to keep in mind, must be cold car ability open cistern to build) , lack water natural temperature tall; wants to observe water is warm next, making a car above all, take accelerator a little while a bit, observation water lukewarm table (the in part won't exceed below the circumstance normally 70, 90 degrees of or so) , if water is warm,lift continuously (for example near red line) , possible what the word uses hand feeling to stand by cistern to carry is largish that conduit, if compare cool, do not feel very hot, that affirms even if cooling system gives an issue! Still have also should decide whether thermostat is good, whether does cooling fan work and so on, final ability decides whether water pump already damaged.

(1) mechanical water pump installs positional machinery water pump to adopt drive of transmission adhesive plaster by engine crankshaft, the rotate speed of its rotate speed and engine becomes direct ratio. The working way of mechanical water pump has an advantage faulty also. Be in when engine below operating mode of high speed big negative charge when the job, the quantity of heat that engine produces is much, the quantity of fluid flow of refrigerative fluid increases the high rotate speed of water pump, such as it happens can raise the cooling power; of engine to be in when engine below operating mode of low speed big negative charge when the job, for example drawing is other car or open air conditioning, the rotate speed of engine is right now low the rotate speed that brings about water pump is low also, reduced the cooling power of engine so.

(Position of installation of 2) electric water pump is dynamoelectric water pump passes voltaic control by engine control unit, it does not suffer at that time the influence of engine rotate speed, can work neatly according to the real cooling need of engine. The engine power that consumes as a result of electric water pump is very little, after using electric water pump accordingly, the fuel wastage of engine can be reduced somewhat.

The structure of car water pump is as follows:

The water pump that car engine uses is centrifugal type water pump, this kind of water pump is sealed by housing, impeller, bearing, pump shaft, water and transmission is taken annulus wait for composition.

(1) housing

Water pump housing by cast-iron or casting aluminium is made. Cast-iron housing wall is large and quality is great, rise as what quantify a requirement gently to engine, only at present certain business uses the water pump that cast-iron housing still is using on the large engine of the car. Partial water route and thermostat installation room still are contained on very much cast-iron housing, this makes the weight of housing further increase. Most car water pump used casting aluminous housing, and the size of housing is smaller and smaller, a lot of housing had had the function of aqueduct no longer.

(2) impeller

Water pump impeller by cast-iron wait for a metal or the project is plastic make, use recurvate half circular arc, double circular arc or blade of form of much circular arc, its blade profile and current direction are consistent, pump water efficiency is taller. Cast-iron the quality of water pump impeller that makes is greater, but mechanical intensity is higher, at present more ground applies at business to go up with the large engine of the car. Easy implementation miniaturization mixes plastic impeller light quantify, and corrosion resistance can be good, the appearance machines easy control, because more and more this car engine water pump used plastic impeller.

The reason that car water pump damages is as follows:

1, idle fast flabby:

Water pump breakdown can cause water pump to turn obstruction increases. As a result of water pump and when leather belt is linked together, water pump turns obstruction increases the roll that can affect engine directly. In idle fast when what expression is the rotate speed after starting is jumpy, in winter more apparent, can cause flameout even.

2, engine uses cause: Abnormal knocking of engine water pump, this kind of sound is roll is fricative, similar " Ceng Ceng Ceng " sound. This kind of sound can be accelerated along with engine roll, produce the change of volume size. This kind of noise is commonly become as the aggravating degree of breakdown more and more apparent. The master worker building a car that has experience commonly should can listen come out. But be in slight when, the likelihood because of water pump change too complex, they say to do not have a thing, the result produced a lot of problems again.

3, cooling system breakdown causes:

This is a series of breakdown phenomenon, be short of cooling water, cooling water to have furring for instance, thermostat is not opened wait for breakdown to be able to cause damage of water pump breakdown.

1) sirocco is not hot:

Because cooling water flows,this breakdown is not the is ignored the most easily appearance that free causes. In winter engine water is warm after coming up, sirocco is blown do not come out, the person that does not have experience thinks the car is washed-up even, should transfer. Change a small water pump to be able to solve a problem completely actually.

2) engine water is warm not stable:

Expression is needle of engine water lukewarm directive to fluctuate inside certain limits. The reason is the water inside pulmonary circulation lukewarm lack a loop and become abhorrent, bring about thermostat to open temperature to lift on one hand, pour out of in high temperature water on the other hand hind, microtherm water flows very quickly to thermostat, make thermostat is shut quickly. Lukewarm metropolis maintains the water of the engine after the course below normal circumstance warms up to compare constant level in, be in about 93 ℃ .

3) cooling water decreases, systemic circulation not free, engine high temperature:

When coming here, water pump has belonged to more serious damage.