Impeller Housing Compatibility question

[HawkX66]

I picked up a 2001 GTX di 951 that needed the jet pump rebuilt. It was out of it with an extra impeller housing. The extra housing was a 155 mm so I thought I was golden. I bought a rebuild kit, installed the two bearings and one seal. I wanted to check fitment so I threw the impeller in and hand tightened it down with the thrust washer and bearing installed on the shaft and no wear ring installed yet. It wouldn't turn. I checked things out and everything seems to be installed right so I tried researching the part numbers. It looks like people use both housings interchangeably.
Can anyone verify that I shouldn't be having problems with either housing? The one that supposedly came off of it is # 271 000 873. The other pump is 271 001 116.
They definitely have a couple of obvious differences so I might just rebuild the original one. I didn't want to waste money on another rebuild kit if I didn't have to. Another thing, the wear ring slid right into the replacement pump and hadn't been drilled for set screws yet. The wear ring will have to be press fit into the original pump like it "should" be.
Any help is appreciated.

 

[mikidymac]

Did you set the bearings and seal in the correct depth per the service manual?

Did you pinch the thrust washer when you installed the impeller?

 

[HawkX66]

Did you set the bearings and seal in the correct depth per the service manual?

Did you pinch the thrust washer when you installed the impeller?

Yes, the bearings are 1.5 mm below (or whatever the spec is) the seal etc. per the manual. I'm not sure how I could pinch the thrust washer. It looks pretty straight forward. This is my first rebuild, so I could be wrong. I'll snap a pic of where it is and post it.

 

[HawkX66]

Here are the pics as it sits now:

 

[mikidymac]

It's easy to pinch the thrust bearing on the shaft because it can get caught on the shoulder of the shaft then crushes it when installing the impeller. It is actually really easy to do.

The best method to prevent it is to install the shaft in a vice clamping it on the real flats. Then install the thrust bearing, then thrust washer and finally the pump over the shaft. Next install the impeller and torque it to spec. With the shaft secure and upright the bearing can't fall into the recess of the shaft and get pinched.

 

[HawkX66]

It's easy to pinch the thrust bearing on the shaft because it can get caught on the shoulder of the shaft then crushes it when installing the impeller. It is actually really easy to do.

The best method to prevent it is to install the shaft in a vice clamping it on the real flats. Then install the thrust bearing, then thrust washer and finally the pump over the shaft. Next install the impeller and torque it to spec. With the shaft secure and upright the bearing can't fall into the recess of the shaft and get pinched.

Gotcha. I guess that's why I was thinking it would be hard to do. I have the flats of the shaft in my vice and I'm doing it exactly like you described.
So does the brass veined housing seem like it should work in place of my original housing even with the differences in the casting around the seal where the shaft is coming up through in one of my pics?

 

[HawkX66]

I think I might have figured out what's going on. It looks like the housing is different enough to cause an issue. I put the impeller on the shaft again, hand tightened it down again just to the point of rubbing and still being able to turn. That way I could hopefully put a mark on whatever it was rubbing against. It looks like the impeller is rubbing on the housing. People must use a different impeller when using this one? Is it possible this is also a 155.5mm vs a 155mm? That might be why the wear ring just slides in the non original housing.
You can see where it rubs in these pics:

 

[mikidymac]

It should work as there is no 155.5 pump. The brass ones were replaced by the plastic pumps.

 

[HawkX66]

Ok. I thought I had read something about a 155.5mm pump somewhere. So "should" is good, but with it not yet fitting right, any idea where I should look next? It's as if the shaft isn't coming through enough, but I can't see what would be holding it up. Everything seems to be seated on the vein side.

 

[mikidymac]

As long as the washer and thrust washer are installed correctly it should not rub the housing.

 

[HawkX66]

As long as the washer and thrust washer are installed correctly it should not rub the housing.

I agree, but it does...
It looks like the brass housing is different. I don't know if it's from a different spec'd machine or what, but the lip that the thrust bearing sits on is .3 mm or so thicker than my factory pump. I measured them with my calipers this time. That amount isn't allowing the shaft to slide through enough. Instead of tightening against the shoulder on the shaft, the impeller is tightening against the brass housing and binding. I removed the thrust washer and everything worked smoothly. That's what made me take the measurement.

 

[mikidymac]

You can't remove the thrust washer, the bearing can't ride directly on the brass pump.

 

[HawkX66]

You can't remove the thrust washer, the bearing can't ride directly on the brass pump.

I removed it just to see if space was an issue which it was.

 

[mikidymac]

Sounds like the impeller isn’t compatible with the pump then.

 

[HawkX66]

Edited for incorrect info.

Looks like I was off. I installed the new impeller shaft that had the p/n for the bronze pump and it did the same thing. The shafts were the same. I took some measurements and although the rebuild kit fits perfectly, the impeller is still rubbing on the housing where it was before.