Re: Bob Aller Oil Pump Rebuild
Posted by humanpotatohybrid On 2024/3/30 7:34:53
Thanks Jack, I appreciate your feedback, though my experience differs on point 1. With a piloted hole and proper technique you can get very good tolerances just with a drill press and bit. For example I have used a 6.3mm (.252) drill in the past to drill sliding fit ΒΌ" dowel pin holes. Obviously yes if you need like 0.0005 diametral tolerance you'll need more precise tools.
Anyway, it turned out that boring the hole was not needed as even though the hole was about .6222 and the bushing .6272, I was able to just tap the bushing in with a ball peen, using the shaft to pilot it. The installed bushing ID is about .497 which is great for the maing shaft dia. Then I just deburred with a drill bit, not by passing the bit, but just holding it at an angle and using the cutting edges to deburr.
The quad ring is easily installed or removed with a pick once the bushing is installed.
Reminder: this is a spare oil pump, not the one off my engine. When I pull that I will inspect it the same way and also try to test the performance of it somehow. Still thinking of the easiest/best way to do that. Want to try as-is, then with this bushing mod, then add Ross's mod on top of that.
Here are pictures showing the install. The second picture shows the approximate location of the installed parts.
Anyway, it turned out that boring the hole was not needed as even though the hole was about .6222 and the bushing .6272, I was able to just tap the bushing in with a ball peen, using the shaft to pilot it. The installed bushing ID is about .497 which is great for the maing shaft dia. Then I just deburred with a drill bit, not by passing the bit, but just holding it at an angle and using the cutting edges to deburr.
The quad ring is easily installed or removed with a pick once the bushing is installed.
Reminder: this is a spare oil pump, not the one off my engine. When I pull that I will inspect it the same way and also try to test the performance of it somehow. Still thinking of the easiest/best way to do that. Want to try as-is, then with this bushing mod, then add Ross's mod on top of that.
Here are pictures showing the install. The second picture shows the approximate location of the installed parts.
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