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Old 11-11-2010, 12:50 AM   #1
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Default Water pump troubles. For the THIRD time. PLEASE provide your input

That's right, not a typo: 3rd time I'm having a leak at the water pump.

I know I know, you get what you pay for. You buy egay and you're taking a gamble on the quality. Well I took the gamble and I lost.

Story:
When I rebuilt the engine I bought a water pump kit for like 70 bux or something on ebay. Car was fine for quite a while. Then I started noticing a drop or two of coolant under the car every morning.
No biggie but it worried me so I diagnosed water pump gaskets as the culprit. Went to vatozone and got new ones. Put em in. It was fine for a while then started leaking again.
This time (about 4-5 months ago) I went straight to Mazda and bought OEM gaskets: the one thats between the wp and block, and the one between wp and waterneck. Install em. Car is great for about 2-3 months.
A couple days ago I finally installed my DIYPNP and started the car up after sitting a while (about a month it sat in the garage waiting on new ecu).

It warms up and now I've got coolant dripping from the front pretty badly. Yank the belts, covers, and here is what I see:




Now its really hard to see in the pic (so I circled the approximate area), but I can clearly see coolant SLOWWWWLY easing out from under the pump and trickling down onto the oil pump, then pan, then dripping to the ground.


Now at this point I'm pretty sure the pump is either defective or deformed somehow since its tightened very well and has OEM metal gaskets in there.


So before I run into the same problem, I want to make sure to pinpoint the EXACT problem and eliminate it permanently:
- Is it just because the pump is ebay and is a POS??? AFAIK there are tons on here running them with good results.
- Did I overtighten the pump somehow and warped it?
- ?????????? anything else?



I'll be getting a new non-Ebay pump of course and another set of OEM gaskets, but want to get your take on it.


THANX IN ADVANCE
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Old 11-11-2010, 12:59 AM   #2
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It could be that the pump is warped so the mating surface isn't completely flat.

Did you use a torque wrench?

My ebay pump has worked fine.

I did notice when installing my WP today that the OEM gasket is metal, while the previous one was made of cardboardish gasket material.

Damnit, this post fails as you've already stated everything. I would say definitely check the mating surface for flatness once you remove it.
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Old 11-11-2010, 01:01 AM   #3
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Are you running straight water?
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Old 11-11-2010, 01:03 AM   #4
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The OEM metal one is the one I used the 2nd time around and it still started leaking. Just spoke to my dad and he says I should just yank pump, put a thin layer of appropriate sealant/silicone on both sides, and reinstall (after cleaning it thoroughly of course).


Bad Idea?
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Old 11-11-2010, 01:03 AM   #5
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Quote:
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Are you running straight water?
Nope
approx 50/50 or something like that. Def not straight water
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Old 11-11-2010, 01:05 AM   #6
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Nope
approx 50/50 or something like that. Def not straight water
Ok...just making sure. Bearings go out faster with straight water.

I thought applying sealant on both sides was the only way to do it.
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Old 11-11-2010, 01:11 AM   #7
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Ok...just making sure. Bearings go out faster with straight water.

I thought applying sealant on both sides was the only way to do it.
I'm starting to think that I'm the only one that "didn't get the memo".

Just spoke with a friend and he said the same thing.

Last edited by 18psi; 11-11-2010 at 01:21 AM.
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Old 11-11-2010, 01:26 AM   #8
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HA even I put sealant in both sides. Ebay pump is still good over here
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Old 11-11-2010, 01:27 AM   #9
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yeah man if some silicone does not fix the problem then you need to get another pump, or maybehave that pump machined flat or something :P
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Old 11-11-2010, 05:32 AM   #10
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hi,

i reuse the oem metal gasket when i change the pump for a new one and throw away the paper gasket they supply with the aftermarket pump. i never had a problem on many cars using my method.

the pump is probably not machines flat enough/warped that silicone should fix it.

this is my method step by step:

1. clean and degrease all mating surfaces with rubbing alcohol and blue shop towel

2.apply permatex grey silicone to to bothe sides of gasket and pump side and block in a think layer

3. then install pump and gently hand tighten the bolts with a socket using your fingers so you can see a lil silicone getting pushed out that is when you stop

4. make sure all bolts are about the same tightness by checking all of them with the socket.

5.let it dry for hour or 2 then tighten to spec

good luck!
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Old 11-11-2010, 06:17 AM   #11
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I'm starting to think that I'm the only one that "didn't get the memo".

Just spoke with a friend and he said the same thing.
Yeah, unless its an o-ring style gasket (ie: basically any new car) then you're always going to need some kind of silicone or something. I'd say the pump was pretty straight if you got that much time between leaks.

I ALWAYS use a torque wrench on water pumps. There is way too much work to do if it leaks.

I was not aware that the OEM gasket was metal. That's...odd.
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Old 11-11-2010, 11:11 AM   #12
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Yeah, unless its an o-ring style gasket (ie: basically any new car) then you're always going to need some kind of silicone or something. I'd say the pump was pretty straight if you got that much time between leaks.

I ALWAYS use a torque wrench on water pumps. There is way too much work to do if it leaks.

I was not aware that the OEM gasket was metal. That's...odd.
Yeah... the metal gasket thing is definitely different. But yeah, either w/ or without the paper gaskets silicon both sides (use grey). And make sure you don't tighten down all the way at first. There are instructions on the tube after all, let it set up then torque it (doesn't have to be a torque wrench, but why not?)
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Old 11-11-2010, 11:15 AM   #13
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I have never used sealant and had about 40k on my EBAY Waterpump with no leaks before I pulled the motor. I have about 10k on my other ebay pump and it is still working strong.
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Old 11-11-2010, 11:31 AM   #14
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yeah ive been running an ebay water pump for a few years now.
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Old 11-14-2010, 12:57 AM   #15
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Quote:
Originally Posted by 18psi View Post

Just spoke with a friend and he said the same thing.
I just swapped the TB/WP in the rental after a WP leak showed up at the track. No sealant. OEM water pump, OEM gasket (both from Mazdacomp), no more leaks. Perhaps the pump itself isn't machined flat and the gaskets are being put under excessive stress.
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Old 11-14-2010, 01:06 AM   #16
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Just replaced it. Used sealant as well JUST IN CASE. If I have to mess with it again I'm going to drive it off a cliff.

Just got done. Everything is together and ready to fire up.

Wish me luck
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Old 11-14-2010, 01:08 AM   #17
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Quote:
Originally Posted by Savington View Post
I just swapped the TB/WP in the rental after a WP leak showed up at the track. No sealant. OEM water pump, OEM gasket (both from Mazdacomp), no more leaks. Perhaps the pump itself isn't machined flat and the gaskets are being put under excessive stress.
Not sure. I wouldn't be surprised if it was.


The thing is too: it lasted a good 6-8 months from assembly to leak. So its not like it was leaking all this time. Maybe it warped recently. Not sure. But all this time I drove it and it was fine.
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Old 11-14-2010, 01:12 AM   #18
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Iono. They should never leak but oh well. The one that came off the rental motor supposedly had 40k on it. Who knows.
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