Re: Bob Aller Oil Pump Rebuild
Posted by humanpotatohybrid On 2024/3/28 15:23:06
I was thinking today about this situation and I think the combination of adding an Oilite bushing and a quad-ring to the non-bearing section of the pump could provide some improvement. Of course this would be in addition to Ross's modification.
This just uses a basic 1/2 x 5/8 x 1 Oilite bushing and a 1/2 x 5/8 x 1/16 fluoroelastomer quad ring. Not sure how much it would help to be honest, but it doesn't seem like it would hurt. Before you ask, the quad ring is rated for both oil/chemicals and up to 400 degrees F.
A fancier way to do it would be to use a ball bearing and a 12X19X5 HMS5 V1 shaft seal though I think that it overkill, and it also requires both overboring the non-bearing section of the bore slightly, to two different bores (18mm for the bearing and 19mm for the seal above it) and also turning down the shaft to 12mm (from 12.7).
The drawing is not necessarily to scale on the vertical axis.
This just uses a basic 1/2 x 5/8 x 1 Oilite bushing and a 1/2 x 5/8 x 1/16 fluoroelastomer quad ring. Not sure how much it would help to be honest, but it doesn't seem like it would hurt. Before you ask, the quad ring is rated for both oil/chemicals and up to 400 degrees F.
A fancier way to do it would be to use a ball bearing and a 12X19X5 HMS5 V1 shaft seal though I think that it overkill, and it also requires both overboring the non-bearing section of the bore slightly, to two different bores (18mm for the bearing and 19mm for the seal above it) and also turning down the shaft to 12mm (from 12.7).
The drawing is not necessarily to scale on the vertical axis.
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