Page 800 - 2006 HARLEY FLSTCI SERVICE MANUAL
P. 800

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                                                                                1                                                                                2006 Softail: Engine
                                        2
                                      3                                                              Figure 3-11. Breather Air Flow (breather disassembled for  illustration purposes only)




                                                                                        Push rod cover  Breather baffle  Umbrella valve Air cleaner backplate bolt  Breather tube



                                                                                    5
                        d0440x3x                                       4                1.  2.  3.  4.  5.








               BREATHER OPERATION







                             NOTE The crankcase breather system relieves crankcase pressure produced by the downstroke of the pistons and allows crank- case vapors vacated from each cylinder to be directed into the air filter element. Through effective recirculation of crank- case vapors, the system serves to eliminate the pollutants normally discharged from the crankcase.  See  Figure 3-11.  As each piston pushes downward on its power and intake stroke, displaced air in the flywheel com- partment is vented through the crankshaft roller bearing into the cam compartment and then up the push rod covers (1) Air rushes under the rocker arm support plate, which is ele- v






                       GENERAL                        into the rocker housing.                                        violation of legal emissions standards.




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