no they are not!
the only bolt that maight be left tread is the fan clutch and only on some models not all.
36mm wrench and a holder for the pulley. The fan is reverse threaded on a diesel.
remove belt via tensioner, four bolts on pulley, five on pump, clean and reverse
The water pump on a 97 Nissan Sentra is behind the timing belt. To replace it you will need to drain the coolant, remove the cylinder head, loosen pulley bolts, drive belts, and water pump pulley. Next, remove coolant hoses, water pump bolts, and finally the old water pump. Reverse directions to replace with new pump.
jack up front of car passanger side remove front passanger tire open hood remove serpentine belt easiest way is use belt tensioner tool locate water pump pulley remove bolts holding pulley on can use vicegrips to keep pulley from turning remove bolts holding pump on reverse process
I'm in the middle of changing one myself and so far i have gathered that you need a thin open end wrench to take off the thermal fan clutch and a large squared open ended wrench that holds the 4 bolts on the pulley. this allows you to hold the pulley and turn that big nut. it is reverse threaded so don't go crankin the wrong way. after that you take off the 4 pulley bolts and the pulley and all the hoses and the rest of the bolts holding the pump to the block and pry that thing off of there. I'm still lookin for that tool so if you happen to already have it and get done before me, tell me how it went and if you ran in to any unexpected extra work.
Drain antifreeze. Jack Passenger side of car up. remove wheel well skirt. loosen pulley bolts on water pump before removing serpentine belt. loosen a/c compressor and slide forward about an inch. remove pulley from water pump. remove 4 bolts holding water pump in. remove water pump. reverse sequence to put new in.
there should be 3 or 4 bolts that hold pulley on, just remove these bolts a pulley should come off. but remove belt first ! if pulley keeps turning while removing bolts. you can hold it stationary with a scredriver or similar.
The water pump is located behind the water pump pulley. The water pump pulley is the smooth pulley at the top closest to the front of the car. It is held in place by 4 bolts with 8mm heads. The pump is held in place with 5 bolts. Warm the engine to operating temperature before removing the bolts or they may break off causing you greif.
First, the neg. battery cable should be removed from the battery, the appropriate belts should be removed, the rad should be drained to at least as low as the bottom of the water pump's lowest point, and the top rad hose should be removed. Then the fan shroud bolts should be removed. The fan and clutch should be attached to the water pump hub by a large threaded nut. If the fan clutch itself needs to be dissassembled, or if the water pump pulley bolts can't be accessed with the fan present, then wedge a prybar or long screwdriver between the pulley bolts to prevent the fan turning and, using the appropriate size wrench, turn the large nut counterclockwise to loosen and remove it. If the water pump pulley bolts can be accessed then remove them and pull out the fan assembly and the fan shroud together. Installation is the reverse of removal. Don't forget to put the shroud and fan back in together.
I just recently changed the water pump on my dad's 1990 Cadillac Deville. It was an undertaking let me tell you. First you have to take a 1/2" ratchet and position it in the place on the belt tensioning pully and pull it toward the front of the car. This will allow you to completely remove the belt. Take note as to how it is oriented around the various pulleys and the back idler pulley. I found that even after I had removed the three bolts that hold the water pump pulley to the water pump itself, I couldn't just remove the pulley. There wasn't enough room between the pulley and the frame. I was removing the water pump anyway, so I painstakingly removed all of the water pump mounting bolts and nuts, and removed the pump with the pulley loose. There are several bolts you can't get to anyway, unless you take the pulley bolts out. I just had to move the pulley to one side or the other in order to get to the bolts under the pulley. Installing the new pump had to be done in the reverse order. The lip of the pulley catches on the water pump shaft and that keeps you from being able to remove it. There may be an easier way, but I couldn't find one. I didn't want to take a lot of parts off to just to get the pulley out of my way. It's tough, but it can be done. I have the cut up hands to prove it. I hope this info helps you.
Loosen the belt with the tensioner pulley. Take the belt off. Drain the water from the cooling system. Remove the hose. Remove the retaining bolts from the water pump. Reverse the process to install the new water pump.
Here is the procedure to do the job. 1 - Drain the cooling system until the coolant is below the level of the water pump. 2 - Remove the guard for the drive belt. 3 - Loosen the bolts for the water pump pulley (do not remove them yet). 4 - Remove the drive belt. 5 - Remove the bolts for the water pump pulley. 6 - Remove the water pump pulley. 7 - Remove the bolts for the water pump. 8 - Remove the water pump. 9 - Remove the water pump gasket. 10 - Clean the water pump mating surfaces. Reverse the procedure to install the new pump, making sure you use a new gasket. Refill the cooling system & check for leaks.