Question about 2006 Yamaha yZ 450 F

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Replaced water pump seals twice on 06yz450 and they keep leaking

So here it is, my water pump seals on my 2006 yz450f went bad on a ride. so i bought new seals and everything and replaced them. three rides later its leaking out of the weep hole. so i buy again new seals and replace them except this time i buffed the pump shaft to clean any stuff that might be on it. within 20 minutes of riding its leaking again. what is going on?

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  • tanner Dec 30, 2012

    Thanks for the reply! The last time i replaced the seals i super cleaned all surfaces before installing the new seals.The part that makes me mad though is that when i went riding this last time and noticed it leaking so soon. i pulled the cap and noticed micro pieces of material that looked like it came from the seal itself. so i think what is happenning is somehow the seals are getting burnt up super fast. i have been using a coolant called engine ice. maybe thats my problem. i know that i need a new shaft but i took the original and probably made it more smooth than when it was origanally installed in the bike, thats why i am somewhat confused. i wasnt sure if maybe it being that smooth made it sticky in a sense.

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  • 157 Answers

I would reccomend replacing both water pump shaft bearings and also the shaft if there is any sign of grooving on the shaft. Without looking at a diagram i am assuming that the water side of this bikes pump is a mechanical(ceramic) seal design . Sucessful replacement of these mechanical seals can be tricky. A few tips are: be certain that all case surface areas are clean with all old seal/sealing debris removed such as with sccotch brite. So that the seal will seat and seal properly in the case. NEVER allow your dirty/oily fingertips to touch either of the ceramic pieces of the seal in the contact area. Lubricate these ceramic pieces with a standard green type of coolant only upon assembly. Always use a regular green type of coolant in the system untill you are confident of the install and then change to another type if you are going to. Be aware that it is not uncommon for the mechanical(ceramic) type of seal to weep slightly during initial break in as the two halves seat to each other. This weepage should dissappear in a short period of running time.

Posted on Dec 30, 2012

  • Mike Haynes Dec 31, 2012

    Now that I have looked at a diagram I see that this model uses 2 rubber seals. The outter one is what seale the water in the pump and the inner one is what seals the oil in the motor. A coolant leak at the weep hole indicates that coolant is passing the seal or the seal washer on the inside of the impellor and escaping through the threads. Be sure you are installing the seals in the correct direction. Typically the flat face of the seal is the outside(away from what that seal is holding in. A clear photo from a service manual is sometimes a good way to determine such as this. Also in a double rubber seal design the shaft and bearing condition are critical. If there is ANY doubt replace the parts. and do not forget the sealing washer on the shaft behind the impellor.. Keep me posted, this shouldnt be this hard.

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It sounds like you probably need to replace the fuel filter, or you may have alot of trash in the bottom of your gas tank, possibly even water in the gas. If you can, take the tank off and clean it out well, making note if there is any trash in it, by emptying it into a bucket so you can examine it. Go ahead and replace the filter if you find any trash or water in the gas tank. If it is ok, then the next thing would be to check the fuel line for aging. Sometimes in rare cases, the hose gets old and weak and when you try to pull fuel through it, it can collapse and essential stop the gas flow, just as if you have turned the gas off, then when the suction is stopped the hose will open back up and appear to be in good shape. You can use your fingers and squeeze the line the entire length and see if it seems to feel excessively soft, if so that could also be causing your problem.

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Remove all rubber parts before you begin. These parts usually include vacuum diaphragms, needle valves, o'rings, hoses, and other parts. Spray cleaners will damage these parts. Do not disassemble individual carbs from the carb bracket.

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you get the impeller of from removing the complete side case ( not only the water pump cover) then you can remove the water by unlock the internal water pump shaft....replace OIL SEAL
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yes your water pump is gone ,will need to replace,this happens when the bearings give out,cheers roady

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