This procedure requires of you to cool down the whole engine. Defective water pump may cause engine overheat, which is a serious problem that can ruin it completely. Moreover, the pump will be unable to circulate coolant through the engine. The easier way to check whether this thing works on your car is to install the same on its machine. Such a part should be replaced with a new one or occasionally an original rebuilt unit if it is not working properly. A front shaft seal helps in sealing water pumps when they are functioning as expected. If there are any problems associated with this element, some coolant might get past and cause a slight leakage at times. To see any sign of leakage at this point on the pump body, you will need to take flashlight underneath vehicle and look at it from there in most cases. When running, they tend to produce squealing sounds especially when their bearings have failed due to reasons such as wear and tear or even lack of oiling lastly we have shaft wear which can be determined by pushing and pulling up and down on water pump pulley as shown in figure 13 below. Water pump failure is not synonymous with drive belt slippage sometimes evident by squealing sound due to slipping between metal drive belt pulleys then for size 8 engines (such as 225 cu ft., 318/360 cu ft., or 400/440 cu ft.), follow these specific procedures during removals and installations of units respectively.In addition, drain cooling system , remove belts , fan ,spacer,pulley ,unbolt heater hose,take off pump,toss gasket,and clean both surfaces that come into contact.The crack around jacking points can lead to cracked timing cover bolts.Sheave bearing inspection would normally include looking for leakages.In order for smooth operation during installation of new components do not forget that you will need new gasket,make sure that drive belt tension is adjusted correctly and the system refilled.