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Cummins V-903 Water pump.
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dntlkbak
Posted 3/23/2017 23:25 (#5918756)
Subject: Cummins V-903 Water pump.


Saskatchewan, Canada		Just a question on these pumps, mine has a small seep from the front seal behind the pulley. Can the pulley be removed and just the seal replaced? and how does one remove the pulley.



(Cummins V-903 Water pump.jpg)



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jbeindit
Posted 3/24/2017 04:21 (#5918823 - in reply to #5918756)
Subject: RE: Cummins V-903 Water pump.


michigan		The hub is pressed on the shaft. A puller will remove it but be careful when pressing it back on, you will need to machine a plate that holds the impeller straight but puts the pressure on the end of the shaft only. Really not that difficult but if you are as far as the seal you might as well change bearings too, they are not anything special.
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raider2b
Posted 3/24/2017 06:52 (#5918953 - in reply to #5918756)
Subject: RE: Cummins V-903 Water pump.


North Dakota		In general the reason the seal is leaking is because the bearings are failing. I'm not sure on the 903 but for a N14 or 855 the bearing kit is only $20- $30 less than a reman pump.
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Roblyn
Posted 3/24/2017 07:36 (#5919046 - in reply to #5918756)
Subject: RE: Cummins V-903 Water pump.


On that pump and some other cummins water pumps you can take out the small plug and put in a grease nipple. ....that will enhance the bearings life by a fair bit thus seals will last alot longer
2 pumps with grease gun every 2 or 3 months
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rancherman
Posted 3/24/2017 09:18 (#5919267 - in reply to #5918756)
Subject: RE: Cummins V-903 Water pump.



If you are getting  coolant out the seal...   it's  time for a  rebuild.

The main coolant seal is   behind  two bearings.   Coolant is  now  contaminated your grease.

I just rebuilt mine  1 year ago.     I SCOURED  the earth for a  rebuilt pump.  "sorry,  obsolete".

Interstate McBee  offers  a  kit.   You'll get EVERYTHING.   Bearings,  seals, impeller,   shaft, snap rings...     

 

If  you need,  I can scan the rebuild process  to you.     Lots of press work,  and   I  could  loan you the seal  depth setting tool.

 

Edit;   #9  shows a grease seal.   In the kit,   the bearings are  self contained sealed.   The original oem bearings were open both sides.     I  popped out the inboard seals,   and allowed  for  grease to   flow into bearing,    



Edited by rancherman 3/24/2017 09:31




(img008.jpg)



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Bern
Posted 3/24/2017 10:01 (#5919347 - in reply to #5918756)
Subject: RE: Cummins V-903 Water pump.


Mount Vernon, WA		If the seep is nothing more than a big stain, and if the bearings are smooth and tight, I would not mess with it. A very small amount of leakage is allowed, as per Cummins.
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dntlkbak
Posted 3/26/2017 00:20 (#5923040 - in reply to #5918756)
Subject: RE: Cummins V-903 Water pump.


Saskatchewan, Canada		Thanks for the info, I think I may take it out and into the Cummins service center near home as I don't have a shop press. Probably will cost a small fortune though.
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