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Crankcase ventalation

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Old Aug 25, 2019 | 04:06 PM
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Default Crankcase ventalation

Noticed a little oil in the air filter on my 07 FXD so is there a pcv valve on these engines.
 
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Old Aug 26, 2019 | 08:23 AM
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in both heads, the is what is called an umbrella valve, a rubber one way disk assy. these can go bad and cause such things. hd vents to the air cleaner. if you have a high mileage machine, blowby can over-whelm the system or other things can cause issue such a sustained high rpm as the oil will have a tendency to pool. above 5k, the c/c with transition from a negative to a positive pressure, hd uses diff'l pressures to move oil around.
 
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