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| techtalk:ih:oil02 [2023/12/31 20:47] – hippysmack | techtalk:ih:oil02 [2025/10/18 06:10] (current) – [1977-1980] hippysmack |
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| ==== 1977-1980 ==== | ==== 1977-1980 ==== |
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| * 1977-1980 models use a fitting (34744-77) with a SAE 3/8" x 16 (x app. 7/16") bolt pattern that has a 1/4" hose nipple on the other end. | * 1977-1980 models use a fitting (34744-77) with a SAE 3/8" x 16 (x app. 7/16") bolt pattern that has a 3/16" hose nipple on the other end. |
| * Generally speaking, the rubber hose should run up under the seat and curl pointing down to keep any water from running down it. \\ If it has rotted or come loose from the fitting it can make a mess of that area. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197565-oil-leakage-from-the-drive-sprocket-area?highlight=transmission+vent#post4342518)) \\ You can use a cable tie to lightly strap the hose to the frame / other or just let it hang. \\ The taller you make the loop, the more that oil mist will stay in the tranny compartment. \\ There should be no sags in the hose between the attachment to the engine and the open end of the hose. \\ | * Generally speaking, the rubber hose should run up under the seat and curl pointing down to keep any water from running down it. \\ If it has rotted or come loose from the fitting it can make a mess of that area. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197565-oil-leakage-from-the-drive-sprocket-area?highlight=transmission+vent#post4342518)) \\ You can use a cable tie to lightly strap the hose to the frame / other or just let it hang. \\ The taller you make the loop, the more that oil mist will stay in the tranny compartment. \\ There should be no sags in the hose between the attachment to the engine and the open end of the hose. \\ |
| This will allow air to escape and oil to separate from the air and drop back down into the tranny compartment. | This will allow air to escape and oil to separate from the air and drop back down into the tranny compartment. |
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| {{:techtalk:ih:oil:1977_tranny_vent_pic3_by_on_.....jpg?direct&300|}} ((photo by on½.... of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/189608-oil-leak-near-solenoid-weird-bolt-underneath-it?highlight=transmission+vent#post4080371)) {{:techtalk:ih:oil:1977-1978_transmission_vent_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/50355-and-yet-another-77-ground-up-rebuild/page11?t=209347&page=11)) \\ | {{:techtalk:ih:oil:1977_tranny_vent_pic3_by_on_.....jpg?direct&300|}} ((photo by on½.... of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/189608-oil-leak-near-solenoid-weird-bolt-underneath-it?highlight=transmission+vent#post4080371)) {{:techtalk:ih:oil:1977-1978_transmission_vent_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/50355-and-yet-another-77-ground-up-rebuild/page8?t=209347&page=11)) \\ |
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| ==== 1981-1985 ==== | ==== 1981-1985 ==== |
