Question about 2004 Yamaha YZ 450 F

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Leakingwater from hole under water pump.

All pump seals and impeller have been replaced but problem of leaking still there. System topped up & header tank is full. Initially suspected impeller shaft as it was rusty.

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U have put the impeller seals in the wrong way round .they must face each other .sidecover seal faces out waterpump seal faces in

Posted on Jun 20, 2013

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Posted on Jan 02, 2017

SOURCE: 04 yfz 450 water pump leaking from weep hole

you get the impeller of from removing the complete side case ( not only the water pump cover) then you can remove the water by unlock the internal water pump shaft....replace OIL SEAL
93109-11073-00 and also OIL SEAL,SD-TYPE
93102-12321-00 just to have you're mind in piece..they are so unexpensive that you d'ont wanna take any chance for 4.00 usd.....cfb12e5.gif

Posted on Oct 02, 2009

sisadsl
  • 1508 Answers

SOURCE: water is leaking from weep hole in water pump

I had to replace the shaft as well in mine so it would seal, it had worn a groove.

Posted on May 05, 2010

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