This is a water pump that was installed on a Volvo MD22L-B. The seal was leaking water, and since I have a groove on the shaft where the seal rides, I could not simply replace the seal. But now I am looking at this pump contemplating a rebuild that will include new bearings, seal, and of course a new impeller and gasket. The cam looks to be in good condition although I will remove it and look at it very closely.
The pump body is my primary concern. The walls are smooth but the inside surface has a partial circular groove in the area of the cam. This groove can be seen in the picture below and can be felt with a fingernail. I attempted to measure the depth with my vernier caliper but the readings varied and I have no confidence in the readings. However, the largest reading I saw was 0.004" and the least reading was 0.0015". The groove is arguably very shallow. If you click on this image it will become full size and the groove will be very easy to see.
There are similar grooves in the cover plate, but I can sand them out with fine sandpaper on a piece of glass.
As for the groove on the shaft at the seal location- Volvo very nicely does not offer a replacement shaft, so I am stuck with buying a complete pump for $500 or so. I plan to install a SKF Speedy sleeve on the shaft to provide a smooth sealing surface.
This will be a pump that I will carry as a spare.
So my question is- Is the groove in the pump body acceptable? I realize that there could be some pumping efficiency lost due to water leaking in that groove, but I suspect it would not even be measurable, so I feel that is not a reason to discard the body.
The pump body is my primary concern. The walls are smooth but the inside surface has a partial circular groove in the area of the cam. This groove can be seen in the picture below and can be felt with a fingernail. I attempted to measure the depth with my vernier caliper but the readings varied and I have no confidence in the readings. However, the largest reading I saw was 0.004" and the least reading was 0.0015". The groove is arguably very shallow. If you click on this image it will become full size and the groove will be very easy to see.
There are similar grooves in the cover plate, but I can sand them out with fine sandpaper on a piece of glass.
As for the groove on the shaft at the seal location- Volvo very nicely does not offer a replacement shaft, so I am stuck with buying a complete pump for $500 or so. I plan to install a SKF Speedy sleeve on the shaft to provide a smooth sealing surface.
This will be a pump that I will carry as a spare.
So my question is- Is the groove in the pump body acceptable? I realize that there could be some pumping efficiency lost due to water leaking in that groove, but I suspect it would not even be measurable, so I feel that is not a reason to discard the body.