Question about 2005 Honda CRF 450 R

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Waterpump impellar removal

How do you remove the waterpump impeller

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  • Anonymous Feb 28, 2009

    i cant take off inpeller because it keeps turning


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First you want to remove the water pump cover, under that you will see the impeller and it should have a 6mm bolt, (10mm head), that you will need to remove. Remove the bolt and then the impeller will lift off a "D" shaped shaft. Note that there will be a copper washer under the bolt securing the impeller, you should replace that every time you remove the impeller bolt because it prevents water from leaking through the shaft into the crankcase.

Posted on Dec 08, 2008

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I am installing a new water pump impeller and cover. To remove the old impeller, some suggest putting pressure against the kickstarter. I tried and that didn't work, the engine still turns over. Others...

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You need to remove the water pump housing, the impeller from the outside then remove the engine side cover. You will then be able to pull the impeller shaft out and then the bearing from the inside of the engine cover

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How do i remove impeller from water pump on wr250f 2003

I am sending you to a web site where you can download a free factory service manual. The removal procedures are in the manual as well as everything else on the bike. The manual on the site is 2003. If you are within 3 years before or after '03 the manual will work for you. What you will do is put a wrench on the impeller shaft next to the gear then the impeller can be unscrewed just as if it were a nut. Please take a moment and rate my answer. Thanks!

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Water pump is leaking on my 2001 Yamaha YZF 426 motorcycle.

First you remove the four 8mm bolt that attach the water pump cover to the side cover, the lowest bolt will drain the coolant. next you remove the coolant pipe with one 8mm bolt. The water pump cover like any part that has been in place for years may need some force to remove and that is why you will find two tabs around the outside of the pump cover for prying it off.

Once you have the cover off the impeller unscrews by way of a built in 10mm nut. This nut is right hand threaded and is removable by rotating it counter clockwise with preferably a 6 point socket as a 12 point socket may round the nut sides since the impeller and built in nut are made of aluminum.

To replace the twin seals (one for water/coolant and one for oil) you must remove the engine side cover from the motor and pull the impeller shaft out from the engine side of the cover. After the shaft has been removed the bearing is pulled out with a bearing puller or sometimes it can be removed by pushing it out from the outside in with a makeshift driver but the bearing can be damaged by this method and it is not recommended. The old seals can now be pulled out or pushed out from the opposite side.

To replace the new seals you must drive them in perpendicular to the impeller shaft with the manufacture markings to the inside. The water seal is installed from the outside and the oils seal from the inside.

There is a tool used for installing the seals called a seal driver but you could make one in a pinch. The seal driver makes contact with the outside diameter of the seal where it is solid and has a metal core. The inside diameter is soft and flexible and should not be used to push the seal in place however it can be used to keep the seal driver centered over the outer diameter and to keep the seal moving in a strait line perpendicular to the impeller shaft.

Once the new seals are in place they should be greased with some lithium soap based grease.

Install the bearing and reassemble the impeller shaft then you are ready to reassemble the engine side cover and water pump housing but make sure you spin the water pump impeller slowly as you install the engine side cover as the impeller shaft is driven off the engine shaft behind it and the shaft needs to be aligned in order for it to fall in place (do not try to force the cover on).

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3 Answers

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How to remove impeller shaft seal YAMAHA YZ 125


The correct procedure is to remove the RHS engine cover. Then remove the impeller and impeller shaft.
Now press out the seal.
If you yank it out, there is a good chance of damaging the shaft or housing. This will be costly in the long run.

Enjoy the ride


Mar 02, 2009 | 2003 Yamaha YZ 125

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How do I go about Timing the Cam

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