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techtalk:ih:engmech07 [2019/12/04 04:20]
hippysmack [Sub Documents]
techtalk:ih:engmech07 [2019/12/04 04:30] (current)
hippysmack [Sub Documents]
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   * [[techtalk:​ih:​engmech07a|Timing the 76< Breather Valve]]   * [[techtalk:​ih:​engmech07a|Timing the 76< Breather Valve]]
  
-The rotary breather valve is timed to open on the downstroke of the pistons. ((1960 HD FSM pg 3a-15)) \\+The rotary breather valve functions to relieve pressure in the crankcase caused by the downstroke of the pistons and it controls the flow of oil in the lubrication system. \\ 
 +It is timed to open on the downstroke of the pistons. ((1960 HD FSM pg 3a-15)) \\
 This allows crankcase exhaust air pressure to expel the scavenge oil from the crankcase breather oil trap into the gearcase. \\ This allows crankcase exhaust air pressure to expel the scavenge oil from the crankcase breather oil trap into the gearcase. \\
-The breather valve closes on piston upstroke, creating vacuum in the crankcase. \\+The breather valve then closes on piston upstroke, creating vacuum in the crankcase. \\
 Crankcase exhaust air from the gearcase is sent out the breather tube. \\ Crankcase exhaust air from the gearcase is sent out the breather tube. \\
 Any oil still in suspension with the air on the way to the breather tube is separated by an oil slinger on the generator drive gear. \\ Any oil still in suspension with the air on the way to the breather tube is separated by an oil slinger on the generator drive gear. \\