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techtalk:ih:engmech02c [2020/08/25 02:06] hippysmack [Pining Bushings with a Set Screw] |
techtalk:ih:engmech02c [2023/12/20 16:03] hippysmack [Selecting Bushings] |
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| ====== Selecting Bushings ====== | ====== Selecting Bushings ====== | ||
| - | The factory machine work on 70< cam covers is stellar. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1717904)) \\ | + | The factory machine work on 70< cam covers is stellar. ((Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/160109-changing-out-cam-bushings-help-on-a-couple-of-questions-appreciated?t=1717904)) \\ |
| Reproducing it at home is nearly impossible. Even in a full machine shop its very time consuming. \\ | Reproducing it at home is nearly impossible. Even in a full machine shop its very time consuming. \\ | ||
| A good (at home) job is possible if you know what your doing. \\ | A good (at home) job is possible if you know what your doing. \\ | ||
| Line 36: | Line 36: | ||
| * Just make sure there are no sharp edges on the bushing or cover bore. \\ You don't need to heat the case or freeze the bushing (unless you choose to). \\ The interference fit isn't great. One or both of the materials will flex under the interference. That adds up to the driving force never getting too great. \\ A note about heating aluminum; as temps rise, so does it's affinity for galling. | * Just make sure there are no sharp edges on the bushing or cover bore. \\ You don't need to heat the case or freeze the bushing (unless you choose to). \\ The interference fit isn't great. One or both of the materials will flex under the interference. That adds up to the driving force never getting too great. \\ A note about heating aluminum; as temps rise, so does it's affinity for galling. | ||
| * Bushing groove placement: | * Bushing groove placement: | ||
| - | * Compare the placement of the grooves in the bushings in the 68 and 78 cam covers below. It's the same. \\ Every factory cover is like this. So is the pin placement. | + | * Compare the placement of the grooves in the bushings in the 68 and 78 cam covers below. It's the same. \\ Every factory cover is like this. So is the pin placement. |
| + | * You have to look at the oiling. ((ryder rick of the XLFORUM http://xlforum.net/forums/showthread.php?t=556788&highlight=cam+bushings+slot)) | ||
| + | * You don't want a slotted bushing on the pinion shaft, because that is what feeds oil to the crank. \\ The slot would allow oil to run from the cover into the gearcase, bypassing the pinion shaft hole and starve the crank. | ||
| + | * The intake with the big bushing gets an oil feed hole drilled in it. No need for the slot. | ||
| + | * The slots go at 9 or 3 O'clock on the other 4 (respectively). | ||
| * Grind the flanges from the bushings as required. | * Grind the flanges from the bushings as required. | ||
| * With a die grinder, relieve the #1 & #3 flanges for gear tooth clearance. Grind until you match up with the cutouts in the cover. | * With a die grinder, relieve the #1 & #3 flanges for gear tooth clearance. Grind until you match up with the cutouts in the cover. | ||
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| Click on a pic to enlarge. \\ | Click on a pic to enlarge. \\ | ||
| + | |||
| + | | Bushings 1,3 and 4 ((photo by billeuze of the XLFORUM http://xlforum.net/forums/showthread.php?t=556788&highlight=cam+bushings+slot)) | Pinion bushing ((photo by billeuze of the XLFORUM http://xlforum.net/forums/showthread.php?t=556788&highlight=cam+bushings+slot)) | | ||
| + | |{{:techtalk:ih:engmech:cam_cover_bushing-1-3-4_by_billeuze.jpeg?direct&300|}}|{{:techtalk:ih:engmech:cam_cover_bushing-pinion_by_billeuze.jpeg?direct&300|}}| | ||
| + | |||
| + | | Rear intake bushing ((photo by billeuze of the XLFORUM http://xlforum.net/forums/showthread.php?t=556788&highlight=cam+bushings+slot)) | Idler gear bushing ((photo by billeuze of the XLFORUM http://xlforum.net/forums/showthread.php?t=556788&highlight=cam+bushings+slot)) | | ||
| + | |{{:techtalk:ih:engmech:cam_cover_bushing-rear_intake_by_billeuze.jpeg?direct&300|}}|{{:techtalk:ih:engmech:cam_cover_bushing-idler_by_billeuze.jpeg?direct&300|}}| | ||
| + | |||
| | 1968 Cam Cover Bushings ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1717904)) | 1978 Cam Cover Bushings ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1717904)) | | | 1968 Cam Cover Bushings ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1717904)) | 1978 Cam Cover Bushings ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1717904)) | | ||
| |{{:techtalk:ih:engmech:68_cam_cover_by_dr_dick.jpg?direct&350|}}|{{:techtalk:ih:engmech:78_cam_cover_by_dr_dick.jpg?direct&450|}}| | |{{:techtalk:ih:engmech:68_cam_cover_by_dr_dick.jpg?direct&350|}}|{{:techtalk:ih:engmech:78_cam_cover_by_dr_dick.jpg?direct&450|}}| | ||
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| * In order to avoid broken taps: | * In order to avoid broken taps: | ||
| * Drills and taps from the supply house aren't very expensive. \\ If you double up and practice the whole operation on some scrap, you will have a much more secure feeling on what your doing when you get to your cam cover. | * Drills and taps from the supply house aren't very expensive. \\ If you double up and practice the whole operation on some scrap, you will have a much more secure feeling on what your doing when you get to your cam cover. | ||
| - | * Locate the holes to be tapped in the beefiest cover material area. | + | * Locate the holes to be tapped in the beefiest cover material area. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1347648&page=8)) |
| * Your cutting tools need to be very sharp or you will have problems. Even slightly dull drills and taps will tend to bite into the aluminum and skid off the bronze. | * Your cutting tools need to be very sharp or you will have problems. Even slightly dull drills and taps will tend to bite into the aluminum and skid off the bronze. | ||
| * Drill and tap dry (oil makes this phenomenon of 'walking' worse) making your holes crooked and crappy. | * Drill and tap dry (oil makes this phenomenon of 'walking' worse) making your holes crooked and crappy. | ||
