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techtalk:ref:engmech04j [2020/10/07 03:44] – created hippysmacktechtalk:ref:engmech04j [2024/01/15 18:35] (current) – hippysmack
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 [[:techtalk:menu|{{  :techtalk:gototechnicalmenu.jpg|}}]] [[:techtalk:menu|{{  :techtalk:gototechnicalmenu.jpg|}}]]
-====== REF: Engine Mechanicals - Sub-04K ======+====== REF: Engine Mechanicals - Sub-04J ======
 \\ \\
 ====== Further Study of Evo Sportster Breather Valves ====== ====== Further Study of Evo Sportster Breather Valves ======
-See the respective sections in the Sportsterpedia for the different breather valves used on Sportsters. \\ + 
-  * [[techtalk:ih:engmech07|IH Crankcase Ventilation (1957-1985)]] \\+See also in the REF section of the Sportsterpedia: \\ 
 +  * [[techtalk:ref:engmech04k|Breather Valves (1957-Up)]] (list of breather valve changes) 
 +  * [[techtalk:ref:engmech05|Breather Venting / Relocation]]
   * [[techtalk:evo:engmech07|Evo Crankcase Ventilation (1986-Up)]] \\   * [[techtalk:evo:engmech07|Evo Crankcase Ventilation (1986-Up)]] \\
 +\\
 +
 +====== Comparing L1984 and 1991 Umbrella Valves ======
 +L1984-1990 umbrella valve (26856-82). \\
 +1991-2003 umbrella valve (26856-89). \\
 +
 +**Dims**: ((Gary E of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/195092-rigid-evo-oil-check-ball-spring/page8?t=2071387&page=8)) \\
 +Outside diameter: \\
 +L1984 - 1.25" \\
 +1991 - 1.0" \\
 +Edge thickness (1/8" in average): \\
 +L1984 - 0.036" \\
 +1991 - 0.041" \\
  
 +  * The pic below shows the left side (filter side) that faces into the cam box.
 +    * It's center inside diameter is slightly larger than the 1.25" OD (-82) umbrella valve.
 +    * The two 'C' shaped slots that do the breathing have an OD of 1".
 +    * As a result, the 91-03 umbrella valve with its diameter of 1" may not perform correctly in L84-90 models since there is likely to be leakage.
  
 +|{{:techtalk:evo:oil:umbrella_valve_by_gary_e.jpg?direct&300|}}|{{:techtalk:evo:oil:breather_baffle_tube_by_gary_e.jpg?direct&300|}}|
 +|  Umbrella (check) Valves \\ L - (26856-82), R - (26856-89) ((photo by Gary E of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/195092-rigid-evo-oil-check-ball-spring/page8?t=2071387&page=8))  |  Breather Baffle Tube (26917-84) ((photo by Gary E of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/195092-rigid-evo-oil-check-ball-spring/page8?t=2071387&page=8))  |
  
  

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