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techtalk:evo:engmech07 [2019/11/14 04:40]
hippysmack [Crankcase Ventilation]
techtalk:evo:engmech07 [2020/06/23 19:47] (current)
hippysmack [Sub Documents]
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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. \\
  
 \\ \\