Q:When the pump is running with frequency conversion, the instantaneous power is greater than the power frequency operation, and the actual flow and lift are less than the power frequency. When running, the efficiency is very low. Why?

Variable frequency pump running normally, its flow and lift is lower than the power frequency operation, that is for sure. The so-called power frequency operation is full speed operation, of course, the head and flow is the highest.Frequency conversion is mainly to save power and reduce the running loss of equipment. The so-called efficiency, but also by the correct selection, the actual pump head and flow as close as possible, the actual working conditions for the best.

Q:for the water pump in MY car that he has been using for his job!! He has threatned that the water pump cost $400 - 500 dollars but I didn't hear abut that when it was done!!! We are breaking up and it is My car but he says that he is taking te water pump out! Can he do that??? We also ave a daughte but I will ask about that later!! TRUST ME!!! I need to know about Custody Battles in Anoka or Hennipin County, Monnesota, 55433!!!! Please Help!!!!!!!!

I don't know so much about legal issues, but 4-500 dollars for a water pump sounds about right. The pump costs about 80 but you have to take out the engine to get it. Usually when they replace the water pump they'll replace the timing belt, too, which again adds to the cost. If he takes the pump out, it means the engine will be out, too. Engines are really heavy, so I doubt that he could do it on his own. If he has a mechanic do it, the car will be stuck at the mechanic's until you get a replacement part, and he still has to pay $300 in labor just to get the thing out of there. It is pretty much, then, an idle threat. He could however, do quite a lot of damage to your car with a hammer. However, that would be vandalism and he would go to jail for it. If he has already paid for the repair, he can't really sue you. He can, but the judge should look at it as a gift, which he can't get back.

Q:2005 pontiac grand prix 3.8 v6There is a scratching type of noise when i start the car. Looked under the hood and it seemed to be coming from the serpentine belt.Took the belt off and and checked the pulleys for any play and turned out the water pump pulley wobbles back and forth too much. Replaced the belt with a new one and want to replace the pulley. It does not seem to have a loose screw so i'm wondering if i can take the pulley itself off and replace it, or would i have to replace the pump too? Still makes the noise with new belt and you can see the pulley wobble a bit when the car is running.

You need to replace the pump itself. The wobble you feel is the bearings in the water pump that are bad. Good luck and hope this helps.

Q:it is a mazda b3000 pick up v6,it is coming from behind water pump,but it is not all the time, i would think that if pump is going it would be all the time, but it will go bone dry for a few dayswhen it does leak it leaves about an 8 inch spot on the driveway,temp gauge goes to its regular spot and does not move,any suggestions would be helpful,thanks

water pumps can leak at different times, i had one that would not leak hot, while running, under pressure, but once it was completely cold it would start to drip, look for a small weep hole , there's a good chance this is wear it is leaking

Q:In 2005, the water pump, export pressure in recent years decreased year by year, the running current is increasing, there are 4 pumps are like this. Professional personnel advice please!

The outlet pressure decreases, indicating a decrease in speed. The increase of the current shows that the load has increased. Generally speaking, the resistance of rotating parts increases. Check that the bearings of the pump and motor are damaged as soon as possible. As soon as you replace it, you will be able to return to normal. If this is done for a long time, the motor is likely to burn out

Q:I switched on the pump and smoke came out of it, i opened the pump n found it hadsome water probably caused the shock. How to repair it or is it dead?? ** its not a wellpump just a normal one that pump the water to the tank from a small reserve

you can refer to further information

Q:I have a Honda 20003 bf15 d short shaft Ineed to change the water pump I have removed the 5 bolts that hold the lower unit it on but the shifter is steal hooked up how doI unhook that?

Please get the workshop manual. From an imperfect memory it should be in forward gear to expose a link - but I could be confusing it with other brands. This brand has a known issue with the water pump if ever run dry as both the impellor and the housing can be damaged instantly. The pump should always be replaced as a full assembly, housing, seals and impellor, as detritus can easily block water galleries and that requires extensive work to remediate. The thermostat should be checked and replaced at the same time. Worn and damaged impellor material can easily end up through the block, head, thermostat etc. and that must be checked for as well. The lower cylinder can be down on compression caused by local overheating due to this and mud, sand and corrosion reducing water flow. An engine that very much must be flushed and looked after after all use - that includes all the larger models with this brand. They are quite a good engine, but seem very heavy for the output to me - particularly compared to lifting a two stroke on and off....

Q:94 f150,302 engine. the water pump comes with 2 gaskets. one behind a metal plate on the pump and another for mounting it to the motor. my question is do you have to use sealant of any kind on both gaskets or can you just bolt it on?

gasket seal wouldn't hurt

Q:Mechanic really could not locate the origin of the leak but says the water pump needs to be replaced and says it's a lot of work and would cost $350. How can the origin of the leak be determined. He used a pump and raised the pressure on the radiator but that didn't reveal anything either. Please help.

It's probably the water pump, but if he has to take the timing belt off anyway, ask him if he can just put a new timing belt on for only the cost of the timing belt.

Q:One mechanic told me that my Toyota Corolla 2004 CE's water pump is leaking and I need to change pump and its belt costing me around $450. I took it to other mechanic today and he told that water pump looks good and no need to worry. I need to know how I can verify that water pump is leaking or not. Below are some facts of the car that I noticed myself.1. The engine collant level is above half level about at 70% 2. I started my car around 8.30 PM @ 90 degree F after break of 3 hours and the temprature gauge reach to half in 5 minutes.Please advice what can be done to determine the leak is there or not else I have to take it to other mechanic.

Look at the water pump. You will see a pink residue around the shaft. That's dried coolant that has leaked out. Feel underneath the waterpump's shaft housing (with the engine cool). It will be moist where there's a hole underside the housing. The hole is supposed to be there. Replacing that water pump is very easy for a mechnaic. The Corolla CE since 1998 has a timing chain instead of rubber belt. You don't need to remove the chain to get at the water pump. It is on the engine block and you'll need to take off the serpentine belt, passenger side front wheel, and an access panel in the wheel well. The pump costs about $50 and takes about 1/2 hour to change. The other $300 dollars is for the guy you talked to to pay his bookie. The serpentine belt will cost about $30 and takes 5 minutes to change. It has a spring loaded tensioner. The coolant level should never go down if there's no leak.