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Re: 9N oil pump bushing
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The "official" Oilite sizing story from NSK: sizing with a single point small radius tool is preferred but a dead sharp reamer is "OK". Honing is a no-no. Their standard practice installation guidelines are attached below.
That said the service parts sold for the N-series oil pump are not Oilite bearings. They are ordinary bronze alloy split bushings with a nominal OD of .625, ID of .567, and OAL of 1.067. Good luck finding an Oilet bearing or silicon bronze bushing that size. The batch of aftermarket service parts I purchased from YT measure .004/.006 over on the OD and .005+ under on the ID when fully compressed in a 3 jaw lathe chuck. From hands on experience I can also tell you that there is no fillet or chamfer on the top edge of the bore in the oil pump housing and when you press one of those bushings into the housing you will peel a significant layer of metal off the OD. Expecting it to be concentric or square after installation is at best wishful thinking.
I've done more than one of these "for hire" and my advice is simple. If you want to avoid problems and comebacks press the bushing into the housing and size it in situ. Either purchase one of the reamer jigs to hand ream it or take it to someone that can indicate it in and ream it on a suitable machine tool.
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