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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Posted on Jan 02, 2017

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1 Answer

My pump squeels loudly. I think it's a bearing that I can't get to because I am having trouble getting the impellar off.


If the impeller has never been removed it may not come off. Impellers unthread counter clockwise off the shaft of the impeller by putting a big flat head screw driver on the motor end of shaft.
If they have been on there for years they can become rusted onto the threads of the motor shaft.
At that point if it will not unthread then you will need to break it off.


Rod
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The impeller is threaded onto the motor shaft. On 2hp motors and above, there is usually a screw with reverse threads to help secure impeller to shaft. To remove impeller, first remove screw(reverse threads) Next, remove back cover off motor. The shaft either has a slot for a screwdriver or flats for a wrench. Hold shaft and unscrew impeller.

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I'm not sure I understand your question.
To get the impellar off of the shaft, leave the motor bolts on.
Open the back end of the motor, there should be a slot in the motor shaft. Use a screwdriver to hold the shaft from rotating and grab the impellar and rotate it counterclockwise to unscrew it.
It sounds easy, but the impellar is probably somewhat corroded on.
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I have never taken this pump apart.
If I were in your position and I could move the impellar 1/8 turn, the next thing that I would do is carefully loosen the nut on the end of the shaft being careful that nothing else disassembles. Once this nut is loose say 2 turns, try the impellar again watching what is moving. It seems that the nut may have to be removed.
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