Typically, the water pump will should be removed because of the water pump failing or the water pump O-ring seals (2) failing v age. Friend may acquire coolant leaking native the weep hole towards the front of the engine v the inside seal failing. Some will warn that the use of silicate-containing antifreeze will ultimately cause injury to the water pump impeller. If your seals room the only faulty items, it is feasible to order the 2 seals separately and also to re-install the old pump. However, the water pump replacement is technically difficult owing come the limited space through which you have to work, so because that the sake of piece of mind, it might be just also to replace the whole water pump. Some 4th generation Maxima’s additionally suffered from faulty timing chain tensioners and also some would certainly argue that the part can end up being “tired” in time (mainly the inner spring), therefore you have the right to elect to replace the time chain tensioner also since it will need to be eliminated anyways.
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Tools:Metric box-and-open ended wrench set — I extremely recommend a ratcheting wrench set (ie. GearWrench)Metric socket wrench set — typical 3/8″ will certainly suffice but the smaller sized profile 1/4″ set will it is in better.Telescoping magnet — you execute not want anything falling into the time chain cover. When removing hardware, apply the magnet for this reason nothing is dropped accidentally, or if that does, you can hopefully fish the end the part.Telescoping winter (optional)RTV sealant — required to reseal the tensioner and also water pump coversTwo M8 x 40mm bolts — because that “jacking” out the water pump
Water Pump Removal
The water pump is propelled by the timing chain, therefore removal needs removing the time chain tensioner to create slack in the chain.
(1) Jack up the former end and place jack stands. Remove the passenger side wheel and also plastic splash guard. Drain the coolant — save the coolant in a bucket because that reuse if that is still reasonably new.
(2) Identify and remove the timing chain tensioner accessibility cover and also water pump access cover attached to the (passenger side) time chain cover. They are boxy, outwardly bulging, black steel covers, every attached by four 10mm screws, as watched the centers of the pics below. Friend will need to gently pry lock off due to the fact that of the gasket sealant applied around the edges. The time chain tensioner accessibility cover (below, left) is rearward that the engine mount whilst the water pump accessibility cover (below, right) is in front of the motor mount. Keep in mind that the water pump accessibility cover is obstructed through the alternator tensioner pulley-block (removed in pic)–this will need to be removed together with the belt by loosing the center nut that the pulley, loosing stress on the belt, and also then the three bolts on the bracket. Since the pulley-block will be eliminated from the bracket, be sure to make note of re-install stimulate of the nut and washers before and also after the pulley. Removed the strength steering belt is optional: that is an ext work yet may do the job simpler by creating an ext room approximately the timing chain tensioner area.
Here’s a pic the the alternator belt tensioner wheel removed:
(3) Remove the timing chain tensioner.
First, familiarize yourself v the position and also components that the timing chain tensioner. You can see that from the acute angle you have actually looking down into the open access port but I used a telescopic winter to gain a better view that the tensioner as shown below. The 2nd picture is of the time chain tensioner removed. Pay specific attention to the spring-loaded piston. You an initial must remove the two long retaining bolts (10mm) and then keeping your ignorance on the piston to keep it from springing out, very closely remove the tensioner together one unit. If friend let the piston shoot the end (as in the picture, right), you run the hazard of having actually the spring or the piston fall down right into the timing chain cover i beg your pardon you have to avoid AT all COSTS. Also note the the long bolts have actually washers which have actually the potential to autumn in as well so pay attention to eliminate the bolts horizontally till they are removed from the covering area. With the timing chain tensioner removed, you will now see the time chain tensioner guide loss into view. Now turn the crank pulley counterclockwise around 20 degrees to develop chain slack top top the water pump. Note: some will certainly say the removal that the tensioner is NOT required to create slack top top the time chain; that only compressing the piston and holding it earlier with a pin/paper clip is sufficient. However, this was no whereby near adequate for me once I tried this. Also, some have argued putting a mechanic’s towel or a sheet of aluminum foil under to block any type of possibility of anything falling into the timing chain cover.
(4) remove the water pump.
There are three 10mm bolts with washers hold the water pump in place. Remove these, again being very careful not to fall these quick bolts or your washers down into the time chain cover. Then use the M8 x 40mm bolts come jack the water pump the end (see pic below, left). The top and also the bottom holes (that you just removed the retaining bolts from) are likewise threaded because that the M8,1.25 bolt. Take succeeding turns tightening the screws, no more than one full revolution each. Together the pump slowly starts come come out, be sure to background the time chain off the gear teeth ~ above the water pump so the the time chain walk not become damaged. When the water pump is far enough out that you deserve to move the unit through hand, remove the 2 M8 bolts since there is not sufficient clearance to eliminate the pump with them tho in place. The simply turn and wiggle the pump at different angles up and out of the tight space. Perform not be surprised to view a gush of coolant spill the end from behind the water pump and also down into the time cover. Loosening the water pump coolant drain bolt minimizes the spillage but it is still pretty significant. Girlfriend will should drain and also refill the oil at this suggest because that this.
(4) Drain and replace engine oil/filter.
Water Pump Installation
(5) Install the water pump.
Place the brand-new inner and also outer O-ring seals top top your new or reused water pump. Coat the seals v coolant. As soon as again, turn and rotate the water pump into position–paying certain attention no to permit the brand-new seals come right into accidental contact with any type of metal surface ar or they deserve to be conveniently damaged–and very gently push into place. While doing this, girlfriend will need to push the limp timing chain up and also out the the way. Reinstall the 4 quick retaining bolts v washers, again being cautious not to drop anything right into the timing chain cover. Make certain the timing chain falls clearly over the this of the water pump gear and also turn the crank wheel 20 degrees clockwise come tighten increase the time chain Again, verify the the gear teeth room firmly engaged with the timing chain.
(6) Install the timing chain tensioner.
To reinstall the timing chain tensioner, you should “cock” the piston every the means into the tensioner body and also prevent that from “unloading” through inserting a pen or a small record clip finish into the little pin-sized side hole near the front opening. I would recommend attaching a string to the pen or record clip in the event that the should fall out and accidentally loss into the timing chain cover. Next, you have to position the cocked tensioner back into place by pulling back on the time chain overview which has due to the fact that fallen in the way. Climate reinstall the two lengthy retaining bolts. This can be frustrating due to the fact that of the restricted space and also because this is mainly done by feel. Again (I can’t say this enough), perform not let the bolts or their washers to fall into the timing chain cover and also be careful not come accidentally pull the pin/paper clip out, unload the tensioner. Once efficiently bolted up, you deserve to then remove the pin/paper clip. The piston need to pop out and contact it’s likewise cylindrical equivalent on the chain tensioner guide.
(7) Replace covers.
First clean both timing chain tensioner and also water pump access covers and also mating surfaces on the time chain sheathe of any old gasket material. Use a degreaser (I provided brake cleaner) come make sure no oil residues have actually fouled the surfaces. Apply high-temp RTV gasket sealant (ie. Permatex) to the covering borders and also reattach and bolt securely. Note: this deserve to be quite an overwhelming and messy due to the fact that of the limited space–have document towels or clean wipes handy! permit the sealant sufficient time come cure.
(8) Final steps.
Replace alternator belt and tensioner pulley. Change coolant. I would certainly recommend filling the coolant reservoir a little ABOVE the “max” line in anticipation that a significant amount will be drawn into the cooling system to replenish the coolant the was lost to spillage when the pump to be removed.
Start up the car. Perform NOT it is in alarmed to hear a horrific chain rattling noise. The noise will eventually quiet but may not go away even when idling because that a while. Rest assured the the noise will go fully away ~ a brief drive approximately the block. Friend may additionally hear a gurgling/bubbling sound as the water pump is pumping coolant and also some wait in the system. After a long drive to get the engine nice and also warm (consider transforming the heater top top to rate the flow of coolant), recheck the level the the coolant reservoir and include coolant if necessary. Never ever remove the radiator cap once the engine is still warm.
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To create an ext working room, the is additionally optional to eliminate the passenger side motor mount. Girlfriend can also remove the strength steering reservoir to move the hose out of the way. Together was formerly mentioned, girlfriend can additionally remove the strength steering belt. Lastly, it is also possible that remove the crank pulley-block will additionally create much more working room. All these need a little more time but may be precious it if you need the extra room ie. Big hands, etc.