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-   -   Don't neglect CCV valve (https://xoutpost.com/bmw-sav-forums/x3-e83-forum/91559-dont-neglect-ccv-valve.html)

kornholio 02-27-2013 11:01 AM

Don't neglect CCV valve
 
157000km ... -26 Celsius (without wind)...

I realize that some oil burning and create smoke ... after less than 1 km of driving. Stop somewhere to check what is wrong. I saw only smoke in engine bay so i decide to check the oil to be sure that i have enough to go home ...

PPPSSSSSSHHHH oil spitted everywhere from the dipstick with enought pression to hit the hood and cover ALL the engine bay ... got me half covered with oil :wow:... what a mess ... ending up on the towing with front end full of oil ...

Sludge in CCV valve frozen up, valve cover blowing up ... according with mechanic.I stop the engine before pression blow up crank seal or ending up in a hydro-lock in oil ... Sludge accumulation was caused by extented recommended (:stickpoke) maintenance interval ...

normally it's a 4 hours jobs, in my case that take 6 hours to clean all the oil, changed belt and valve cover gasket ...

JCL 02-28-2013 02:42 AM

It was actually caused by too many short trips, not getting it hot enough and keeping it there long enough to burn off the moisture in the crankcase. Leads to formation of condensate paste under the valve cover, which collects in the CCV, and at cold temperatures it freezes.

If it freezes shut, it blows out the easiest path, usually the valve cover gasket. In this case, it can't hydrolock. If it freezes open (less likely) it can draw in oil from the sump on over run, ingest the oil, and potentially hydrolock.

kornholio 02-28-2013 09:23 AM

since i buy it (120k km last year) it almost never do under 20km trips ...

so in my opinion ... it enter in "highly recommended" maintenance between 120k and 160k km like waterpump, thermostat, tensionner and a lot of others things ...


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