Author Topic: Water pump repair  (Read 4391 times)

0 Members and 1 Guest are viewing this topic.

Offline timur

  • CB500X Pro
  • ***
  • Topic Author
  • Posts: 439
  • Country: es
Re: Water pump repair
Reply #20 on: October 03, 2019, 04:11:13 PM
*Originally Posted by yojimg [+]
I put the water pump shaft from the pump I tore apart onto my lathe and tried to measure the bend in the shaft. Here are some videos. The last video is of another whole pump that leaked but not as badly.

https://www.instagram.com/p/B3KNn7Ll0ZVky9UhAVHBvUsqxQWNQaTDl2XSvI0/?igshid=1tmrizfeatyju
Seems that the link is broken - can't see the video :003:

Offline yojimg

  • CB500X Pro
  • ***
  • Posts: 113
  • Bike: 2015 CB500X
  • Country: us
Re: Water pump repair
Reply #21 on: October 03, 2019, 04:43:43 PM
Let me figure out how to post videos here, and I'll update.

Offline yojimg

  • CB500X Pro
  • ***
  • Posts: 113
  • Bike: 2015 CB500X
  • Country: us
Re: Water pump repair
Reply #22 on: October 03, 2019, 06:32:04 PM
OK Trying from Flickr this time.

Water pump shaft, impeller side -- has about 0.001 inches of runout:
Honda CB500X Water pump by Jim G, on Flickr

Water pump shaft, engine side -- has about 0.015 inches of runout:
Honda CB500X Water pump by Jim G, on Flickr

And for giggles, I chucked the engine side of the pump shaft in the lathe...0.035 inches of  runout:
Honda CB500X Water pump by Jim G, on Flickr

Finally, here's another pump that is still assembled.  This shaft has about 0.010 inches of runout at the engine end.
Honda CB500X Water pump by Jim G, on Flickr

Thoughts?

Offline timur

  • CB500X Pro
  • ***
  • Topic Author
  • Posts: 439
  • Country: es
Re: Water pump repair
Reply #23 on: October 03, 2019, 07:25:07 PM
My point of view - the 0.001 is the most sigificative runout since it represents the rotation axis of the shaft (it's the part of the shaft supported by pump body and where impeller is mounted). And it's not bad in my opinion. I mean - for a shaft that rotates at maximum speed of 3000RPM it should't be a problem. There is no enough speed for such shaft length to produce significant disbalance or vibration IMHO :084:

P.D. I think that one of the possible source of vibrations could be a lack of concentricity of a oil pump axis and water pump shaft axis. Water pump is driven by oil pump so its alignment should be critical. There is no manner to measure it without specific equipment :157:

Last Edit: October 03, 2019, 07:42:13 PM by timur

Offline yojimg

  • CB500X Pro
  • ***
  • Posts: 113
  • Bike: 2015 CB500X
  • Country: us
Re: Water pump repair
Reply #24 on: October 03, 2019, 08:31:12 PM
By the way, these are all videos -- click on each photo to watch on Flickr!

*Originally Posted by yojimg [+]
OK Trying from Flickr this time.

Water pump shaft, impeller side -- has about 0.001 inches of runout:
Honda CB500X Water pump by Jim G, on Flickr

Water pump shaft, engine side -- has about 0.015 inches of runout:
Honda CB500X Water pump by Jim G, on Flickr

And for giggles, I chucked the engine side of the pump shaft in the lathe...0.035 inches of  runout:
Honda CB500X Water pump by Jim G, on Flickr

Finally, here's another pump that is still assembled.  This shaft has about 0.010 inches of runout at the engine end.
Honda CB500X Water pump by Jim G, on Flickr

Thoughts?

Offline yojimg

  • CB500X Pro
  • ***
  • Posts: 113
  • Bike: 2015 CB500X
  • Country: us
Re: Water pump repair
Reply #25 on: October 03, 2019, 09:44:21 PM

Offline yojimg

  • CB500X Pro
  • ***
  • Posts: 113
  • Bike: 2015 CB500X
  • Country: us
Re: Water pump repair
Reply #26 on: October 03, 2019, 10:03:05 PM
Honda use this same sort of mechanical seal in their Odyssey ATV as well.  Sheesh.  http://www.pilotodyssey.com/PO/viewtopic.php?f=111&t=13821

Offline timur

  • CB500X Pro
  • ***
  • Topic Author
  • Posts: 439
  • Country: es
Re: Water pump repair
Reply #27 on: October 04, 2019, 07:13:15 AM
Thank you for the info Yojimg - very interesting articles!

My experience - when my pump failed I inspected the surfaces of the seal with a microscope and did't found any problem (or I wasn't able to detect it). It was bit strange - the pump started to leak with first 1000 kms on a new bike, then stopped to leak and 20000 kms later started to leak again at higher rate. The carbon side of the seal didn't wear - when I compared it with new seal they was identic. Had I measured it with a caliper for sure there was some difference but there was a risk of scratching the seal surface so the comparison is visual.

So I have no idea why it leaked. Everything seemed to be ok  :157:

Offline yojimg

  • CB500X Pro
  • ***
  • Posts: 113
  • Bike: 2015 CB500X
  • Country: us
Re: Water pump repair
Reply #28 on: October 04, 2019, 04:32:42 PM
My first two pumps leaked coolant. The one on my bike now has not leaked any coolant, but is now leaking oil. :(

Offline vackor

  • CB500X Member
  • **
  • Posts: 22
  • Country: hu
Re: Water pump repair
Reply #29 on: April 19, 2020, 07:06:08 PM
Hi! What leaked to you, water or oil? I have this problem too. 6 months, 1800 km, and is leaking oil.
*Originally Posted by timur [+]
Thank you for the info Yojimg - very interesting articles!

My experience - when my pump failed I inspected the surfaces of the seal with a microscope and did't found any problem (or I wasn't able to detect it). It was bit strange - the pump started to leak with first 1000 kms on a new bike, then stopped to leak and 20000 kms later started to leak again at higher rate. The carbon side of the seal didn't wear - when I compared it with new seal they was identic. Had I measured it with a caliper for sure there was some difference but there was a risk of scratching the seal surface so the comparison is visual.

So I have no idea why it leaked. Everything seemed to be ok  :157:

 



victorious-backstage