Q:I just had my water pump replaced and a coolant flush. 35 miles later, my MAL light came on and my mechanic said my thermostat needs replacement. Should this have been done with the water pump work, or could the work have caused the thermostat problem?

My philosophy on thermostats is if I don't have a reason to suspect trouble with it I don't change it. Thermostats don't have any particular life expectancy - the one in my daughter's Accord is 18 years old and works better than new aftermarket thermostats I have tried. I haven't replaced a thermostat in about 15 years. They are often blamed but (until recently, with the introduction of fail open thermostats) rarely at fault. EDIT - I also agree with BR549, although for a different reason. Professionals have to work somewhat differently than DIYers because of where the costs fall. I would rebuild a starter and it would be a lot better than a store-bought rebuilt, but a pro would be taking on unnecessary risks if he didn't replace the starter. His perspective splits the question in two: should the thermostat be replaced during coolant service, and should a professional mechanic replace the thermostat during coolant service? I answer no to the first and yes to the second. The replacement may actually be a step down from the one we know works, but it is also the safer way for a pro to go.

Q:overheating.it has a new thermostat,radiator is clean.temp stays normal during idle,rises when i start to drive.ac is off when this happens.its a 4.7 dodge durango.can water pump simplyquot;go badquot;without ever leaking?

The short answer to your question: It is unlikely that a water pump will go bad without leaking, but weirder things have happened. Your thinking is right overheating only when you drive is an indication of limited flow, either caused by a restriction (radiator, hose, thermostat), an air bubble, or a bad pump. Are you sure that the air is bled out of your system? If you have an air pocket in your engine or at the pump, you will get reduced flow. I think that the 4.7 Durango has a radiator cap, if so, with the engine cold, take the cap off, fill it, and start the engine. If you get bubbles every time you rev the engine, then you may have a bad head gasket, this would introduce bubbles in the system... Make sure that the lower radiator hose is not collapsing. Most of these hoses have a stiff spring inside to keep them from collapsing when the water pump is running. Otherwise, my guess would be that your pump is bad, or you have more restrictions in your system. Good luck.

Q:Work done in water pumping?Water is to be brought from a well 60 meters bellow ground level to a tower 10 meters high, once there the water falls freely on a 5000 liter tank. A submerged pump 10 meters under water level and a two inch diameter pipe is to be used. What is the work done by the pump when 2000 liters have been served to the tank; what is the power of a pump selected to do this work in 20 minutes.

Power_W = (Mass_kg * Gravity_m/s/s * Height_m) / time_s Where: Mass kg is 1kg/l of 2000 liters Gravity is 9.81m/s/s Head is 60m + 10m (height). The suction head is ignored because the pump is submerged. In practice there is some suction head due to intake restrictions like pipes, check valves, strainers. The time is 20 minutes in seconds. The work is the energy used in the time allocated, which is: power * time in seconds, which is watt seconds = joules. Not needed here as it is in the formula above. Power is the rate of doing work. The depth below water is not really relevant except for pipe losses which increase the head slightly. The flow is 2000 liters/20 minutes = 100 l/min. This can be used with the head of 70m to determine the pipe restriction, which amounts to a pressure drop representing extra head added. It will indicate whether the pipe is too small (excessive head added) or whether the pipe is overkill (no head added). You can find on line calculators for this, e.g. search pipe resistance flow on line calculator. I am guessing a 2 inch pipe has little loss at this flow. This is the so called water power. It is the output power of the pump. The pump may only be 50% or so efficient, so the mechanical power delivered by the motor needs to be greater by this ratio. The electrical input power to the motor is greater again to allow for motor efficiency. This might be 60-90%. In practice the efficiency of pump and motor are determined from user manual or specification of the actual devices with the actual loads (head and flow).

Q:guys i have a mini-water pump.....i wanna pump kerosene instead of water,to make a mini stove,on my own..my doubt is ...if the water pump is used to pump kerosene,will the kerosene ignite inside the pump itself or will cause any problem..i just want the pump to pump kerosene....will it ignite inside of the pump,because the pump runs on electricity....can u clear my doubt

Is the motor of the pump built-in so that the pumped fluid flows through the motor also? If the answer to the question is yes then do not use the pump for pumping kerosene. However, if the pumped liquid does not come in contact with motor then you can use the pump for pumping kerosene. But ensure that the pump shaft seal is of mechanical type (so that kerosene does not leak from the shaft sealing area) with parts (specially any rubber parts) compatible with hydrocarbons (use viton rubber parts instead of EPDM)

Q:When my wife was driving on freeway, the alternator belt broke and battery sign showed up. She also told that the temperature gauze showed high. Luckily she reached home with the battery fully charged. When I checked under hood, there was coolant spill surrounding water pump . I could not figure out where the coolant came from. Overnight parking did not show any further leakage of coolant. is there a need to change the water pump also.

For one thing. Once the belt breaks your battery light will come on because the alternator can't charge the battery anymore and also your car will overheat if you have a serpentine belt because once the belt is broke nothing will move anymore including your water pump. Your leak probably came from the overflow tank which is normal when a car overheats. You don't seem to know much about cars so I assume that you really don't know where the water pump is. Change the belt and than hope to god that she didn't run the car to long while it was hot to crack the head gasket . oh and make sure you add enough coolant back to the cooling system before you start the car again

Q:Having a hard time taking out the water pump on my 2004 Grand Am. it's been leaking anti-freeze for some time and finally had the time to fix it. Didn't know it will be so difficult to take out. So hopefully it won't be so difficult to put back up.

You did not say if you have a 4 cylinder or a 6 cylinder. The 6 is really easy so I will assume you have a 4.If equipped with an automatic transmission, remove the exhaust manifold. Refer to Exhaust Manifold Removal in Engine Mechanical - 2.2L (L61). Drain the cooling system. Refer to Cooling System Draining and Filling . Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. Remove the right front tire and wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels. Remove the front fender liner. Refer to Front Fender Liner Replacement in Body Front End. Remove the access plate on the water pump sprocket from the timing cover. Install J 43651 to the water pump sprocket. Use the access plate bolts to secure J 43651 to the engine front cover. Remove the bolts that secure the sprocket to the water pump. Remove the bolt (1) that secures the engine block to the water pump. Remove the bolt (2) that secures the engine front cover to the water pump. Remove the feed pipe that joins the thermostat housing to the water pump. Remove the 2 bolts that secure the water pump to the engine block. Remove the water pump.

Q:It is known that it takes an hour to pump water, and also to know the head. How does the pump power need to be calculated? What's the formula?

Motor Power (kw) =0.163*Q*H*K/60/EOf which: Q is the flow, unit m^3/hH is the lift, unit ME is the efficiency value of the pumpK is the safety factor, generally 1.1.

Q:What is the difference between a sewage pump and a clean water pump? Why can't sewage be pumped with clean water?

The clean water pump and the sewage pump are different from the design. It also requires different material. Sewage pump requires material of solid phase friction, acid and alkali corrosion resistance, and other high resistance, and clean water pump can ignore these requirements. In addition, the sewage pump in a large proportion of large solids content of the fluid can also work normally, and clean water pump in the design can not meet the long-term use of this environment requirements.Of course, clean water pump can also be used for sewage, but only temporary measures, and the life expectancy, the effect can not be guaranteed.

Q:I want to buy a tree spraying rig for my property but would like to know its theoretical capabilities first. The rig has a gas powered diaphragm pump capable of delivering 20 GPM @ a maximum pressure of 300 psi. The hose coming from the pump is 150' long and is 0.75in diameter. It has a solid stream nozzle that measures 0.1875in diameter. What would the maximum theoretical elevation that this setup could deliver a steady stream of water? The nozzle would be aimed at between 45 and 60 degrees from horizontal.

well water exerts about 1 atm pressure (15psi) for each 33 feet of depth so 300psi is about 10 atm meaning that your pump could support a column some 330ft high then figure what pressure you would need to make your spray effective and subtract 33ft per 15psi this is only a ballpark estimate losses in hoses will be significant

Q:22KW pump motor direct start circuit breaker and contactor size? Concrete calculation method

Strictly speaking, eleven kilowatts or more is not allowed to start directly