AOS + Crankcase vent valve -replace both ?

[Schnell Gelb]

AOS - premature failure.

How prevalent is a failure of the Crankcase Ventilation Valve part #  996 107 047 51, in accelerating the  failure of the AOS ?

I ask because I found a comment that this could be the case but the majority of AOS posts never mention the Crankcase Vent Valve.

Is it a good idea to remove and clean  the Vent valve  following an AOS smoke-bomb event ? Just use gasoline to flush out the oil ? Any specific test to check the function of the Valve ?

Thanks for any experiences shared.

 

Edited March 29, 2017 by Schnell Gelb

[JFP in PA]

The vent valve is rarely involved as when it fails, it tends to shut off or reduce vacuum flow to the crankcase.  As they are cheap, if you were to take it out to check it, I would just can in and put in a new one.  And by-the-by, it is not at all unusual to have short lived AOS units, particularly if they are non factory.  We have had exactly zero luck with aftermarket units and now only use factory.

[Schnell Gelb]

Thanks JFP. The AOS was installed by the cheapskate P.O. and sourced from Pelican ,so probably URO brand a.k.a. U Replace Often.When I extract it I'll confirm

The AOS and many other parts are listed in my email order to Jeff Clark @ Sunset.I just got an email from Sunset Parts. No mention of Jeff Clark any more. William is the Mgr ,then there is : Bob, Sean, Luke & Futty

Edited April 1, 2017 by Schnell Gelb

[Schnell Gelb]

I found the AOS was perfect when I dissected it so am wondering about a different diagnosis .The link below is an old post so I have copied some relevant content here for convenience:

 

[Ahsai]

Did you measure the crankcase vacuum before the AOS replacement?

[Schnell Gelb]

No, as I mentioned - it was way to smokey in the garage and on the lift, to do the test. Stupid assumption on my part. But hopefully useful for others to learn from.

Member Kabra had a similar problem reported elsewhere. It was Intermix ! So I'll hunt for signs of coolant in the oil and v.v .Then three is always the possibility of stupid things like overfilled oil.Yes, I am clutching at straws.

[SteelStroke]

I replaced mine with the factory one last year along with all hoses.  No problems.