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Thread: new waterpump leaks when off

  1. #1

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    new waterpump leaks when off

    I just did my timing belts and all the general maintenance and everything went smoothly but for some reason my waterpump leaks. If the truck is running not a drop will come out but as soon as I turn it off it leaks pretty steady. What would cause this did I forget to put something here?
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  2. #2

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    They come with a new gasket .Gasket could have torn or not centered correctly .Also make sure it's torqued to spec.

  3. #3

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    Is it leaking from the coolant gallery pipe that runs around to the back of the block? Either the 'O' ring is messed up and/or the pipe alignment is out or not pressed in firm enough. You might get away with some sealant. They can be tricky to get to seal up sometimes.

  4. #4

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    It was pressed up as far as it would go I guess it's the only ring then I don't remember there being one on. Thanks for the quick replies

  5. #5

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    i will usually use a small amount of silicon on the gasket and were the o-ring seats in the pump just in case. Also, when you go to put the truck back together after checking the pump and are done setting the timing belt up, fire it up with just the timing belt and balance shaft belts on to see if everything aligned properly. this way if it the balance shafts are not timed correctly you can immediately fix it. make sure thou that nothing will get caught in the timing belt like the spark plug wires and such. the balance shaft belts will make a vibration that you wont miss if they are not 99.99% correct. I do it this way just to save myself the trouble of removing everything again.

    Oh and if that's an eBay dnj pump, get rid of it. i bought one and it would do the same thing because it was cast wrong. go with one from you local parts store, they are not expensive at all.

    good luck.

  6. #6

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    Yeah everything is lined up good and it runs without vibration. The waterpump was bought at advance auto I'm not sure what brand it was. I will probably go tonight after work and pick up some o rings and seal everything off with rtv as well.

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    If you didn't put on a new O ring it's going to leek when cold or with out pressure. The pipe may have rust on it.
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  8. #8

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    Ok guys i went to the parts store and bought a generic pack of o rings and even used a bit of rtv around it and it still leaks just as bad as before. Do i need to order the o ring from mitsubishi or is my water pump just a little bigger? I bought the pump from advance auto and its from the brand "GMB". The rotor is a different style than the one i took off but im pretty sure that wasn't the original.

    Also do you think if i wrapped some plumbers tape on the waterpipe it would hold?

  9. #9

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    is the pump cracked? or did the block crack possibly somehow? check to see if the radiator hose is not cracked and that there is not a pin hole in the pipe with the o ring.

    hope you get it figured out.

  10. #10

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    Quote Originally Posted by finalfighter View Post
    ...check to see if the radiator hose is not cracked and that there is not a pin hole in the pipe with the o ring.
    These pipes are prone to corrosion and it might not have been prevalent before replacing the water pump assembly. They normally get eaten out at the ends of the metal pipe. The one off my engine was so bad it was like a shower head after I chemically cleaned it. The 'O' ring is a pretty thick item so you have to be sure you're using the right one or it won't seal.

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