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techtalk:evo:engmech07 [2019/08/18 02:38] hippysmack [2004-Present Engine Breathing] |
techtalk:evo:engmech07 [2020/06/23 19:47] hippysmack [Sub Documents] |
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|{{:techtalk:evo:oil:breather_valves_by_dk_custom.jpg?direct&300|}}|{{:techtalk:evo:engmech:04_up_breather_1_by_bored_now.jpg?direct&300|}}|{{:techtalk:evo:engmech:04_up_breather_2_by_bored_now.jpg?direct&300|}}| | |{{:techtalk:evo:oil:breather_valves_by_dk_custom.jpg?direct&300|}}|{{:techtalk:evo:engmech:04_up_breather_1_by_bored_now.jpg?direct&300|}}|{{:techtalk:evo:engmech:04_up_breather_2_by_bored_now.jpg?direct&300|}}| | ||
- | | 2006 Breather Valves ((photos by JackAttack of the XLFORUM http://xlforum.net/forums/showthread.php?p=4435889)) || | + | | Oil drain hole. ((photo by dieselvette of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=30)) | 2006 Breather Valves ((photos by JackAttack of the XLFORUM http://xlforum.net/forums/showthread.php?p=4435889)) || |
- | |{{:techtalk:evo:oil:06_rocker_box_removal_9_by_jackattack.jpg?direct&300|}}|{{:techtalk:evo:oil:06_rocker_box_removal_8_by_jackattack.jpg?direct&300|}}| | + | |{{:techtalk:ref:engmech:04_up_breather_valve_2_by_dieselvette.jpg?direct&300|}}|{{:techtalk:evo:oil:06_rocker_box_removal_9_by_jackattack.jpg?direct&300|}}|{{:techtalk:evo:oil:06_rocker_box_removal_8_by_jackattack.jpg?direct&300|}}| |
| 2013 Breather Valves ((photos by chris_b_owens of the XLFORUM http://xlforum.net/forums/showthread.php?t=1832762&page=47)) ||| | | 2013 Breather Valves ((photos by chris_b_owens of the XLFORUM http://xlforum.net/forums/showthread.php?t=1832762&page=47)) ||| | ||
- | |{{:techtalk:evo:oil:2013_crankcase_breather_2_by_chris_b_owens.jpg?direct&300|}}|{{:techtalk:evo:oil:2013_crankcase_breather_1_by_chris_b_owens.jpg?direct&300|}}||{{:techtalk:evo:oil:2013_crankcase_breather_4_by_chris_b_owens.jpg?direct&300|}}| | + | |{{:techtalk:evo:oil:2013_crankcase_breather_2_by_chris_b_owens.jpg?direct&300|}}|{{:techtalk:evo:oil:2013_crankcase_breather_1_by_chris_b_owens.jpg?direct&300|}}|{{:techtalk:evo:oil:2013_crankcase_breather_4_by_chris_b_owens.jpg?direct&300|}}| |
+ | |||
===== Check the breather to gasket seal ===== | ===== Check the breather to gasket seal ===== | ||
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Also there is a bump to take up extra space next to the umbrella housing and it fits nicely in the hole of the gasket. \\ | Also there is a bump to take up extra space next to the umbrella housing and it fits nicely in the hole of the gasket. \\ | ||
- | {{:techtalk:evo:engmech:oem_gasket_1_by_dieselvette.jpg?direct&300|}} ((photo by dieselvette of the XLFORUM http://xlforum.net/forums/showthread.php?p=5769573#post5769573)) {{:techtalk:evo:engmech:oem_gasket_1_by_dieselvette.jpg?direct&300|}} ((photo by dieselvette of the XLFORUM http://xlforum.net/forums/showthread.php?p=5769573#post5769573)) | + | {{:techtalk:evo:engmech:oem_gasket_1_by_dieselvette.jpg?direct&300|}} ((photo by dieselvette of the XLFORUM http://xlforum.net/forums/showthread.php?p=5769573#post5769573)) {{:techtalk:evo:engmech:oem_gasket_2_by_dieselvette.jpg?direct&300|}} ((photo by dieselvette of the XLFORUM http://xlforum.net/forums/showthread.php?p=5769573#post5769573)) |
**Using Cometic Rocker Box Gaskets**: \\ | **Using Cometic Rocker Box Gaskets**: \\ | ||
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====== Head Breather Bolts ====== | ====== Head Breather Bolts ====== | ||
+ | ===== Sub Documents ===== | ||
+ | * [[techtalk:evo:engmech07a|Making 91-03 Breather Bolt Holes Smaller]] | ||
+ | |||
See also [[techtalk:ref:engmech04|Evo Crankcase Pressure and Engine Breathing]] in the REF section of the Sportsterpedia. \\ | See also [[techtalk:ref:engmech04|Evo Crankcase Pressure and Engine Breathing]] in the REF section of the Sportsterpedia. \\ | ||
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== 91-03 == | == 91-03 == | ||
- | 91-03 breather bolts. \\ | + | 91-03 breather bolts. \\ Outside threads are 1/2" x 13 (hole through the middle is 5/6" nominal). \\ |
{{:techtalk:evo:carb:91-03_breather_bolts_1_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) {{:techtalk:evo:carb:91-03_breather_bolts_2_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) | {{:techtalk:evo:carb:91-03_breather_bolts_1_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) {{:techtalk:evo:carb:91-03_breather_bolts_2_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) | ||
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They also allow the air to leave the vents at a faster rate. \\ | They also allow the air to leave the vents at a faster rate. \\ | ||
- | 04+ breather bolts (small hole is nominally 1/16" or 1.5875 mm). ((tomcat of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=19)) ((Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=22)) ((http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) \\ | + | 04+ breather bolts. \\ Outside threads are 1/2" x 13 (2 different sizes thru the middle - nominally 1/16" (1.5875 mm) in the rear and 5/16" in the front). ((tomcat of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=19)) ((Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=22)) ((http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) \\ |
{{:techtalk:evo:engmech:04_up_breather_bolt_3_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) {{:techtalk:evo:engmech:04_up_breather_bolt_2_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) {{:techtalk:evo:engmech:04_up_breather_bolt_1_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) | {{:techtalk:evo:engmech:04_up_breather_bolt_3_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) {{:techtalk:evo:engmech:04_up_breather_bolt_2_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) {{:techtalk:evo:engmech:04_up_breather_bolt_1_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) | ||
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{{:techtalk:evo:engmech:stainless-steel-breather-bolts-1_by_folkie.jpg?direct&300|}} {{:techtalk:evo:engmech:stainless-steel-breather-bolts-2_by_folkie.jpg?direct&300|}} | {{:techtalk:evo:engmech:stainless-steel-breather-bolts-1_by_folkie.jpg?direct&300|}} {{:techtalk:evo:engmech:stainless-steel-breather-bolts-2_by_folkie.jpg?direct&300|}} | ||
+ | ====== Symptoms of Breather problems ====== | ||
+ | Read more here on the [[techtalk:ref:engmech04#engine_breathing|Engine Breathing System]] in the REF section of the Sportsterpedia. \\ | ||
+ | The most noticeable signs of breather valve problems are weeping gaskets or oil excessively leaking out the breather or puking oil out of it. \\ | ||
+ | When the umbrella(s) gets hard, it doesn't flex well to allow the engine to breath out on exhale. \\ | ||
+ | Then the trapped in air is compounded on the next stroke. The excess air contributes to more vacuum created and implodes the gaskets. \\ | ||
+ | Or it contributes to too high of oil density and slings excess oil out. \\ | ||
+ | Other factors are involved so results will vary. \\ | ||
\\ | \\ |