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techtalk:ih:engmech01c [2023/12/19 23:46] hippysmack [Speedometer Drive Gear Boss] |
techtalk:ih:engmech01c [2023/12/19 23:47] hippysmack [Primary / Transmission External Vent (1977-1985)] |
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| * 1977-1980 models: | * 1977-1980 models: | ||
| - | * The transmission was vented to atmosphere starting in 1977. \\ The vent fitting is threaded into the right case at the inner hole closest to case parting seam (previously battery box / oil bracket bolt location). \\ The inner hole is in a position where trans oil doesn't seem to get tossed around as much so it doesn't eject much oil. \\ All 76< long frame cases (except 71ch) will accept the vent bolt in the 77> position. \\ Conversely installing the vent bolt in any of the four short frame rear mount bolt holes usually results in drips from the vent. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?p=5133975#post5133975)) \\ This particular fitting works with either the Prestolite or Hitachi starters. | + | * The transmission was vented to atmosphere starting in 1977. \\ The vent fitting is threaded into the right case at the inner hole closest to case parting seam (previously battery box / oil bracket bolt location). \\ The inner hole is in a position where trans oil doesn't seem to get tossed around as much so it doesn't eject much oil. \\ All 76< long frame cases (except 71ch) will accept the vent bolt in the 77> position. \\ Conversely installing the vent bolt in any of the four short frame rear mount bolt holes usually results in drips from the vent. ((Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/93964-how-to-remove-the-oil-transfer-valve/page3#post3744870)) \\ This particular fitting works with either the Prestolite or Hitachi starters. |
| * 1980-1985 models: \\ | * 1980-1985 models: \\ | ||
| * These models have a 1/4" OD metal tube (26272-81) pressed into the right case instead of a threaded fitting. \\ The smaller nipple works with the beefier Nippon Denso starter change in 1981. \\ **1981 cases**: The pressed-in vent nipple is on the top right of the case just under the end of the (new type) starter solenoid. \\ **1982-1985 cases**: The pressed-in vent nipple was moved farther in toward the center, still under the solenoid (back to 77-80 location). | * These models have a 1/4" OD metal tube (26272-81) pressed into the right case instead of a threaded fitting. \\ The smaller nipple works with the beefier Nippon Denso starter change in 1981. \\ **1981 cases**: The pressed-in vent nipple is on the top right of the case just under the end of the (new type) starter solenoid. \\ **1982-1985 cases**: The pressed-in vent nipple was moved farther in toward the center, still under the solenoid (back to 77-80 location). | ||
