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ok there are two o rings in the water pump one keeps the oil from the timing chain side to come in the water and also keep the water/coolant separate from the oil side the second one keeps from coming out of the engine. i am sure the first o ring i talked about is pinched or damages or is not installed when the water pump was installed.
You need to get a repair manuel if you are going to try this your self . That water pump is driven internally by the timing chain. The pump housing also tends to corrode and sieze to the timing chain cover that it mounts to and if you are not a technician i would not recommend that you attemp this job .... you can damage the engine timing cover case very easy changing this style water pump. If you crack it you are looking at big $ to replace that cover.
Place a drain pan underneath the radiator. When the engine is cool, drain the cooling system from the radiator into the pan.
2
Place a car jack underneath the oil pain to support it. Also, to protect the engine parts, put a block of wood onto the jack.
3
Disconnect the negative battery cable and remove the engine mount and bracket on the right side.
4
Take out the drive belts as well as the idler pulley bracket, the chain tensioner cover and the water pump cover.
5
Push the timing chain tensioner sleeve up and put a stopper pin in it to keep it from slipping. Take out the chain tensioner assembly.
6
Turn the crankshaft pulley in a backward motion until it rotates 20 degrees.
7
Place 2 MB bolts into the threaded holes of the pump and tighten them by hand, alternating turning a half turn each at a time unit they reach the timing chain rear case. Doing it this way will prevent damage to the timing chain rear case.
8
Remove the water pump, throwing away the old o-rings. Make sure not to let the water pump hit the timing chair.
Install the New Water Pump
1
Clean all the mounting surfaces on the water pump and covers.
2
Install the new water pump with the new o-rings, tightening the bolts to 75 to 95 inch pounds (8.5 to 10.7 Nm).
3
Turn the crankshaft pulley back to its starting position (20 degrees forward).
4
Install the chain tensioner and water pump covers, tightening to .092 to 130 inch pounds (2.3 to 3.3 mm).
5
Take out the stopper pin from the timing chain tensioner.
6
Put a bead of liquid sealant onto the mating surfaces of the water pump and timing chain tensioner.
7
Install the timing chain tensioner with the water pump to the engine block, tightening the bolts to 87 to 113 inch pounds.
8
Add the drive belts, the idler pulley bracket and the engine mounting bracket with the engine mount.
9
Reinstall the negative battery cable and remove the jack from under the engine. Install drain plugs to the cylinder block.
10
Start the car and check for leaks when the engine reaches normal operating temperature.
Continue to monitor for the next few days for air bubbles in the system causing the fluid level to go down. NEVER TOUCH A HOT ENGINE, CHECK WHEN ENGINE IS COOL. Good luck! --My Car Doc
water pump is cheap tirty dollars for it but putting in is different story runs by timming chain under the cover big job dont try this unless you have done this before .
not for a novice person. pretty labor intensive repair. you need to remove the 2 access covers (black in color) on the front of the engine. left cover has timing chain tensioner behind it. the right has water pump behind it. you need to remove the tensioner forst and rotate engine counterclockwise to be able to take the pump out. the pump needs to be pulled out with (2) 8 mm bolts which will act like a puller. than you can take out the pump. its not for novice person. it takes me about 3 hours to do that job and i have been working on nissans for 15years.
The water pump is located behind the timing chain cover. There are two black plates on the front cover. The one near the front of the car has the water pump behind it. The other one has the timing chain tensioner behind it. First you must drain the coolant. Then support engine and remove engine mount. Then remove drive belts. Then remove the two black plates. Push the tensioner in and lock it with a paper clip. Then remove the two bolts holding the tensioner and remove tensioner. Then remove the water pump bolts. Rotate engine crankshaft the take tension off of water pump (about 20 degrees). Then install two bolts into water pump threaded flange (M8). Tighten M8 evenly as water pump will come without damaging it. Check for corrosion. Then replace with new one. Make sure you use new "O" rings. Lubricate with engine oil. Put the original three bolts back in the water pump. Then install timing chain tensioner and black covers. Replace belts and engine mounts. Add coolant and pressure test system.
To replace the water pump, you will need to remove all the drive belts. Then there are 2 black covers on the front timing cover. One cover is for the chain tensioner, the other is for access to the water pump. I would recommend you replace the tensioner the same time you do the water pump. The reason is, you need to remove that tensioner so the chain has slack. When the chain has slack, you can then unbolt and pull the water pump out. It could get stuck, so there are bolts that you need that you would use to run in to pop the pump free.
You are going to need someone that is Really good Welding Aluminum as all the Import Blocks are Aluminum. Some good Mechanics can Weld this Back on Well enough to Use the Hole again for the Bolt. I would make some Calls and see if you cannot Find one. Please Rate My Response! Thanks!
First you need to take off all the belts, then remove the a/c line to axcess to the 8 mms bolts holding
the upper and lower timing belt covers. To facilitate the job you will need to remove lower crankshaft pulley. This is a delicate job, since you have to access to the cam belt, I suggest buying the haynes manual for your car and following the step by step illustrated procedure, before starting the job.
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