Re: 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.
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The seal is a2 part assembly.
Stop the shaft from spinning first!
Then get a good hold of the impeller, maybe with a pair of pliers?water pump pliers. Then spin off counter clockwise. Regular thread direction.
Once off, shaft seal will be accessible.
a pair of pliers meaning 2 one to hold the shaft and the other to remove the impeller piece , but you will need to take out the threw bolts and take off the seal plate from the motor. these are fragile pumps.. best of luck
Water coming out of the hole is to indicate that the pump seals need to be replaced. Some water is probably in the gearbox now. If the oil is whiteish you do. Pull the right case cover then remove the pump cover and the impeller then replace the seals. Remove the liquid gasket so that the hole is open again. You can see a parts diagram at www.babbittsonline.com Click on the red "OEM PARTS" tab. Items 6 and 7 are the seals separating the water from the oil. Put a wrench on the impeller shaft next to the gear, then unscrew the impeller as if it were a screw. It would be good to replace the gasket (item 10) as well. Please take a moment and rate my answer to your problem.
Most often, the shifter shaft seal is on the inside of the left-side engine/transmission cover. Check this with your repair manual. If so, you would need to remove the shifter assembly from the shifter shaft and then remove all the machine screws that hold the cover on and remove the cover (sliding it off the shifter shaft). If this is the case, you will also need a replacement cover gasket in addition to the shift shaft seal and it will be much less messy if you drain the engine oil first. Also, take care in re-installing the new seal and wrap the knurled end of the shifter shaft with tape prior to sliding the cover back on so it doesn't damage the new seal.
The two seals in the diagram below are separated by the casing they fit into. The impeller is threaded to screw onto the impeller shaft. I think you already knew that by your "holding the tire" note. The center casing does not get split. The right casing does remove then a wrench is used on the shaft as the impeller unscrews counter clockwise. It is risky to "Lock the wheel" because the gear on the impeller is very thin and can break.