Mzee
Active Member
UPDATE:
Yesterday I removed the water pump to fix it. Unfortunately I forgot to take pictures. Here is a short description. It was not hard to remove the water pump. Using the service manual which I found complicated perhaps because of the diagrams, I still used it. The diagram below shows the different parts I used to rebuild the pump, seven parts all together. In disassembling the parts, the hardest parts to remove were parts 8 and 6. I used a small flat screw driver and a mallet. I cleaned the housing and the impeller using petrol. The bearings, part 6, were near the end of their life.
Parts 6 and 8 were also the hardest to put back. You need spacial tools from Yamaha according to the service manual. I did not have any. I improvised and used socket spanner 27 for gently nudging part 6 in and socket spanner 25 to nudge part 8 back into position using a mallet. I assembled the pump, put it back following the recommendations of the service manual, tightened everything back, new coolant.
In starting the bike, I did not hit the start button right away, hit it as if to start, but did not for about four times just to make sure the coolant had reached the pump. Then started the bike to check for leaks. None. The oil that was previously a vexing point was gone. Rode the bike for about 20 minutes keeping an eye on the temperature, nothing. All good.
I am a complete armature in removing and rebuilding the pump. The manual was useful and a lot of common sense. It was way cheaper than buying a new pump and paying a Yamaha specialist to install it. My advice, don't change the oil seal only if you should find an oil leak; I changed all the parts except the impeller as I have indicated in the diagram.
Disclaimer, unless you know what you are doing, don't follow my advice.
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