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Posted by Chriscase on Tuesday, December 30, 2008 at 22:50:01 :
In Reply to: Drill Bushing posted by David S. Beadle on Tuesday, December 30, 2008 at 20:08:09 :
The idea is to make them hard so they don't wear from drills. You won't be able to ream them afterwards. But then they are available in various sizes, by the .001. So buy a bushing oooh, .003" over on the ID, drill and ream the OD to only about .001 tight, press in the bushing.
Bronze bushings are probably cheaper. and reamable after install. Use 'hand reamers' if you can, they are used for things like king pins that are done in chassis. Bronze is good enough for the spring side, which has exactly as much load as the frame side.
MSC probably has bushings. You can use two or three short ones, then ream all together after insatll. Or a bearing supply house can get it by the foot, cost lots more.
I assume you'll lube through the pin? Otherwise, if lubing through the mount, the bushing will need a hole in it, not doable with drill bushings.
I wonder if you can ream everything for an oversize pin? Shackles, spring bushing, and mount hole? Talk to your spring shop?
Oil clearance is universally .0015 to .003" The only thing that isn't is wrist pins to pistons, you want those as tight as possible because the piston will expand with normal heat.
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