Question about 2005 Yamaha WR 250 F

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How do i remove impeller from water pump on wr250f 2003

I am havivg difficulty finding how to replace the water seal in the water pump i have a new seal but cant seem to get the impeller out. what do i need to remove to get something to hold onto to undo the impeller?

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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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Posted on Dec 12, 2009


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1 Answer

Water is leaking out bottom of pump

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there is small seal each side of your water pump impeller when you take the impeller out replace both even if only one needs doing as you will be going back to replace the one left soon after as they always go together..
Most people would not do this repair without replacing the impeller as well - usually the impeller starts to wear groves where it spins inside the seals then damages the seals So you get the theory behind replacing the whole lot as old impeller can damage your new seals
The seep hole is designed to give you warning of burst seal before its way to late as without the seep hole leak you would have no idea you are leaking coolant into the motor
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The shaft seal more likely than not needs to be replaced. If your shaft seal has been leaking for any length of time, the bearings could be damaged and this should be replaced. The whisperflow uses a PS1000 shaft seal and is fairly easy to replace (most seals available online or at most swimming pool retail stores). It is best advised not to run the pump until you have had this inspected by a licensed pool technician or have changed out the seal.

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Check the pump for operation and you should be good to go!

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I am having difficulty removing the impeller on my Polaris PB4 Booster pump. I removed the seal plate and held the motor and attempted to turn the impeller counterclockwise. Can't get the impeller to...

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Water pump doesn't work but there is no water leak it can be just a sensor problem?

No, but it could be the impeller inside the water pump, has come loose from the impeller shaft.

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I have replaced water pumps, (With a brand new one), and have had to remove it, and reinstall with another one.
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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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2 Answers

Yamaha WR250F Leaking coolant

yes thats the weep hole it leaks when your water pump iner seal starts going bad,

Nov 27, 2008 | 2005 Yamaha WR 250 F

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