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Offline yojimg

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Re: More water pump blues
« Reply #10 on: December 11, 2019, 11:10:09 PM »
*Originally Posted by Gills [+]
See bigbobby's reply #11 here: https://www.cb500x.com/index.php?topic=5285.11 A number of the pumps in stock at his dealer had bent shafts. It may be that there are bad batches around. :003:

Yep.  I've checked all of my pumps (I now own 4!) and their shafts all have about 0.010" of runout.  There's another water-pump thread here that I've posted videos in.

Offline timur

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Re: More water pump blues
« Reply #11 on: December 12, 2019, 09:22:22 AM »
*Originally Posted by yojimg [+]
Yep.  I've checked all of my pumps (I now own 4!) and their shafts all have about 0.010" of runout.  There's another water-pump thread here that I've posted videos in.

I think there would be another reason for such systematic failures - misalignment between oil pump and water pump shafts. Water pump is driven by oil pump so their axis noncoincidence will produce vibrations and bending loads on both shafts.

This would explain why on some bikes water pumps leaks every 10000 miles and on another they last forever. In this case I suppose there must be signs of wear inside the groove on end of water pump shaft :084: Yojimg - has your pump shafts some visible wear there?

Offline yojimg

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Re: More water pump blues
« Reply #12 on: December 12, 2019, 06:49:19 PM »
*Originally Posted by timur [+]
I think there would be another reason for such systematic failures - misalignment between oil pump and water pump shafts. Water pump is driven by oil pump so their axis noncoincidence will produce vibrations and bending loads on both shafts.

This would explain why on some bikes water pumps leaks every 10000 miles and on another they last forever. In this case I suppose there must be signs of wear inside the groove on end of water pump shaft :084: Yojimg - has your pump shafts some visible wear there?

I've started wondering the same thing -- like maybe the culprit is actually the oil pump, which drives the water pump?  That said, I haven't noticed any visible wear in the drive slot of any of my water pumps, nor on the drive tab on the oil pump itself.  I'd like to examine the oil pump's drive tab spinning, but that would require turning over the engine with the water pump removed....


 


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