water pump shaft sheared

[swinenh]

Hello all, I have a 2006 ram 2500 that had a water pump failure yesterday, and had it towed home. After removing the water pump I found that the shaft had sheared and there seemed to be an extra part that was not on the new replacement pump.

Both the water pump that was in it and they one in the picture that I'm going to put back in it are both aftermarket (different brands because they were having trouble with the other ones failing they now tell me.) Any thoughts on what the coned piece that has the cut in it is? almost looks like some kind of restrictor plate that was in the motor

. Any help would be greatly appreciated as its cold as hell in New England and working on trucks outside in the cold is no fun...thanks, -Jared

 

[NIsaacs]

The tin piece is part of the pump, some have it and some don't.

Nick

 

[swinenh]

Thanks Nick, that's a little more reassuring, can't imagine how it could shear that shaft like that with it only being belt driven. Oh well hopefully it didn't do any more damage, I'll go put the new one in and find out. Thanks, -Jared

 

[mwilson]

View attachment 90536

The tin piece is part of the pump, some have it and some don't.

Nick

X2. What Nick said.

Cummins has gone away from the plate over the fins for some reason.

 

[ata]

The tin cone on the pump was to keep the fins from flexing and breaking off on the OE Cummins pump. There has been a couple of guys on site that reported they had fins come off that didn't have the cone. I don't remember if they were after market or OE pumps.

 

[brods]

Jared, do you know what brand the pump with the snapped shaft was?

From the damage it appears the spot welds broke and the loose disk piece eventually jammed the pump which caused the shaft to break. I have a new Bosch pump on the shelf that looks similar to your broken pump. There are no heat marks on the back side of the disk to indicate sound spot welds to the blades … makes me wonder if tig welding the disk piece to the blades in a few places would be cheap insurance..

The tin cone on the pump was to keep the fins from flexing and breaking off on the OE Cummins pump. There has been a couple of guys on site that reported they had fins come off that didn't have the cone. I don't remember if they were after market or OE pumps.

Interesting. From a pump performance standpoint the disk piece makes the pump a closed impeller design while the other pump is an open impeller design. An open impeller pump’s efficiency depends on minimal clearance between the impeller blades and the pump housing (which is called the volute). The greater the gap the less efficient the pump becomes. Most open impeller pumps have a way to adjust the clearance between the impeller and the housing. With a closed impeller that clearance doesn’t matter. If it the disk was only there to stabilize the fins why would they put another disk on the back side of the impeller as well?

A great site for pump information: http://www.mcnallyinstitute.com/10-html/10-1.html

X2. What Nick said.

Cummins has gone away from the plate over the fins for some reason.

Much lower cost of manufacturing?

 

[Mark31]

When my original pump started leaking a few years ago, I replaced it with a Carquest lifetime warranty open pump. It fainted last month and they gave me a closed one. Glad to hear "the rest of the story", as Paul Harvey would say.

 

[ata]

If you have both types of pumps in front of you, you could measure how thick the impeller blades are and see why they put the plates on the OE closed face pump.