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| techtalk:ih:oil01a [2024/08/30 01:31] – [Feed Oil Passages Through Pics] hippysmack | techtalk:ih:oil01a [2025/01/13 19:29] (current) – [Cam Cover Oiling] hippysmack |
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| ====== Feed Oil Passages Through Pics ====== | ====== Feed Oil Passages Through Pics ====== |
| ====== 1957-1976 Case Oil Scavenge Paths ====== | ====== 1957-1976 Case Oil Scavenge Paths ====== |
| The pics below show the flow from the flywheel cavity to the return pump (applies to 76< only). \\ | |
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| * The slot that runs East and West on the rear wall leads to the oil trap near the breather gear. \\ (oil galley, oil slot, oil passage, maybe other names for it) \\ That is the way out for both air pressure and pressurized oil from piston downstroke. \\ | ===== Cam Cover Oiling ===== |
| * The oil trap is a compartment (or temporary trap) that is sealed off from the gearcase by the breather window being closed. \\ Both the two different breather windows open after the pistons start decending. \\ The pistons create positive air pressure before the breather opens (later down the cylinder). \\ So when the breather opens, oil and air are shot out of the gear faster since the piston has now built up some juice behind. \\ So air and oil is "trapped" there momentarily by piston pressure during downstroke. | |
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| **XL / XLCH scavenge oil path out the of the crankcase**. | The oil going up to the top end not only passes by the bushing in the cam chest, but also is fed to and from the cam cover and through the cam cover gasket. ((XLFREAK of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/98031-suggestions-on-lack-of-oil-to-top-end/page2?t=831522&highlight=crankcase+pressure&page=2)) \\ |
| | Oil slot. ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams/page3?t=1204854&page=3)) | Half of an oil slot. ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams/page3?t=1204854&page=3)) | Oil trap. ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams/page3?t=1204854&page=3)) | | It is possible for the gasket to blow out and seal up the oil galley feed passages.\\ |
| |{{:techtalk:ih:engmech:cc_flow_1_by_dr_dick.jpg?direct&300|}}|{{:techtalk:ih:engmech:cc_flow_2_by_dr_dick.jpg?direct&300|}}|{{:techtalk:ih:engmech:cc_flow_3_by_dr_dick.jpg?direct&300|}}| | Also if silicon was used on the cover, it is possible for that to break loose and stop up the passages.\\ |
| | Another view of the oil trap. ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams/page3?t=1204854&page=3)) | Breather / oil pump installed. ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams/page3?t=1204854&page=3)) | Oil enters the pump here. ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams/page3?t=1204854&page=3)) | | You can take the cover off and run a tap down all the threaded holes to clear out any obstructions.\\ |
| |{{:techtalk:ih:engmech:cc_flow_7_by_dr_dick.jpg?direct&300|}}|{{:techtalk:ih:engmech:cc_flow_6_by_dr_dick.jpg?direct&300|}}| {{:techtalk:ih:engmech:cc_flow_8_by_dr_dick.jpg?direct&300|}}| | Also check that the face of the cover and case are not marred by some big scratch or dent.\\ |
| | To get old silicone out of bolt holes, you can use an inflation needle for footballs/basketballs/soccerballs. ((rivethog of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/98031-suggestions-on-lack-of-oil-to-top-end/page2?t=831522&highlight=crankcase+pressure&page=2)) \\ |
| | Cut the tip off of it then screw it into the end of an air blowgun.\\ |
| | It's narrow enough that it doesn't block debris from getting out of the hole. |
| |
| ===== Cam Cover Oiling ===== | |Oil path of 85 style cam cover ((photo by billeuze of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/115252-cam-fitment-question-on-ih-help-me-out-plz?t=1103082)) | |
| The oil going up to the top end not only passes by the bushing in the cam chest, but also is fed to and from the cam cover and through the cam cover gasket. ((XLFREAK of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/98031-suggestions-on-lack-of-oil-to-top-end/page2?t=831522&highlight=crankcase+pressure&page=2)) \\ | |{{:techtalk:ih:oil:85_cam_cover_1_by_billeuze_annotated_by_hippysmack.jpg?direct&300}}| |
| It is possible for the gasket to blow out and seal up the oil galley feed passages. \\ | |
| Also if silicon was used on the cover, it is possible for that to break loose and stop up the passages. \\ | |
| You can take the cover off and run a tap down all the threaded holes to clear out any obstructions. \\ | |
| Also check that the face of the cover and case are not marred by some big scratch or dent. \\ | |
| To get old silicone out of bolt holes, you can use an inflation needle for footballs/basketballs/soccerballs. ((rivethog of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/98031-suggestions-on-lack-of-oil-to-top-end/page2?t=831522&highlight=crankcase+pressure&page=2)) \\ | |
| Cut the tip off of it then screw it into the end of an air blowgun. \\ | |
| It's narrow enough that it doesn't block debris from getting out of the hole. \\ | |
| |
| |Oil path of 85 style cam cover ((photo by billeuze of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/115252-cam-fitment-question-on-ih-help-me-out-plz?t=1103082))| | |
| |{{:techtalk:ih:oil:85_cam_cover_1_by_billeuze_annotated_by_hippysmack.jpg?direct&300|}}| | |
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| ===== Cam Cover \ Gasket ===== | ===== Cam Cover \ Gasket ===== |
