Cute little trick to diagnose blocked CCV system... - Page 4 - Bimmerfest - BMW Forums



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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #76  
Old 04-23-2018, 03:09 PM
josemedeiros007 josemedeiros007 is offline
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Quote:
Originally Posted by e46help View Post
What if the O-ring is bad on the oil dipstick what is still make the glove blow up

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My guess is that it would not and oil would be leaking out the dipstick tube mount point, but if you have over a 100,000 miles on your BMW engine, it's recommended to change your CCV and hose's, so you should consider doing it.
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  #77  
Old 04-23-2018, 06:48 PM
rdl rdl is offline
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Quote:
Originally Posted by e46help View Post
What if the O-ring is bad on the oil dipstick what is still make the glove blow up

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Assuming everything else is working properly, a bad O-ring would leak air into the crankcase since the CCV maintains a vacuum of 4-6 inch water column. The engine would see this as a vacuum leak, just like any other.

Or are you asking if both the CCV and the O-ring are bad?
If the CCV failure mode is to create pressure rather than vacuum (i.e. blow up the glove) then air would leak out at the faulty O-ring and could carry oil droplets with it, making a mess around the tube.
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  #78  
Old 10-21-2019, 10:26 AM
e39s e39s is offline
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Here's a quick test showing a failed CCV. Listen to that extreme suction as the cap is removed with the car running. There should be very little or light vacuum.

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  #79  
Old 10-21-2019, 07:14 PM
cn90 cn90 is offline
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Well,

When a PCV system fails, usually it is from a clog ---> increased crankcase pressure ---> oil leak past the seal etc.

The video you posted above is from a different mode of failure: too much suction. Funny enough, this is exactly what you want in an M54 engine to reduce oil consumption.
The "BavarianE39 mod" is exactly that: creating a lot of suction to reduce oil loss from leaky piston rings.
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