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General E46 Forum
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Old 12-28-2015, 08:49 PM   #1
Oz Striker
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My Ride: '00 330Ci, '07 350Z
CCV Modification - NOT Delete!!!

I'm in the process of perhaps installing an after market oil separator. I say perhaps as I only installed an OEM one about 15k miles ago. But I don't want that oil vapour crap going back into my intake tract so for now I simply did the following:

I removed the oil vapour distribution piece marked in purple (ignore the the other hoses and wiring its part of the LPG/Autogas system)




Run an appropriate hose from the top of the oil separator down past the MAF to the under body of the car.




Cap off the smaller outlet, a tyre valve cap fits perfectly:



Tyre valve caps with some self adhesive tape around them are also perfect for plugging up the 6 inlet holes. I also placed a rubber washer under the cap to make a good seal




I've not had any lean codes, and no detrimental affects, if anything i thought the car was a little perkier at lower rpms the 1st time i drove it, but after that I've since normalised to it and cant say I notice it now.


I know there was some mention of the crankcase requiring negative pressure. Currently at least when the car is moving there will be a drafting affect (no undertray at the moment), BUT i also just removed the secondary air pump and valve and it got me thinking....





You could run a hose from the smaller outlet from the oil separator round to the small inlet of the exhaust valve... not sure if that would provide the correct level of pressure required though
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Last edited by Oz Striker; 12-28-2015 at 08:56 PM.
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Old 12-28-2015, 11:50 PM   #2
miller09
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Should a filter or check valve be added to the hose running under the car to keep debris out? Just a thought. Interesting idea though
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Old 02-18-2016, 02:37 PM   #3
Oz Striker
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Quote:
Originally Posted by miller09 View Post
Should a filter or check valve be added to the hose running under the car to keep debris out? Just a thought. Interesting idea though
Yes good idea, a small gauze filter, or gauze material on the end of the pipe would be worthwhile.
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Last edited by Oz Striker; 02-18-2016 at 02:37 PM.
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Old 02-18-2016, 04:15 PM   #4
Oz Striker
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My Ride: '00 330Ci, '07 350Z
So not long after doing this mod, the car was parked up for about a month as i was doing various bits and pieces on it (incl front brake pipes). Upon putting everything back together, I took it for a short ride and everything seemed fine. The following day I was out on a longer drive and after 30 miles the oil warning light came on, I pulled over, and saw oil dripping from underneath, and it required 3 litres to top up! I nursed the car home, buying more oil on my way back, with it needing another 4 litres after stopping a few times to top up.

I was quite confused as to what could cause such a drastic oil leak. The drain plug was good. The leak was coming from the left side of the car, initially I thought it was the oil filter gasket, knowing it had small leak..... but it just seemed too much The car currently has done 135k miles, valve cover gasket and oil filter gasket are due for changing.

Heres a pics of the area behind the oil filter housing and then a pic of the oil pan which is coated in oil:






I cleaned up both areas and then with the airbox removed, started up the car and waited..... eventually the leak was found at the O ring at the base of the oil dipstick. The video shows it perfectly, esp at 52 secs onwards:




Now what I'm trying to figure out is, if doing this modification is what resulted in the oil leaking past the O-ring? I'm trying to figure out pressures and stuff! Or was it just coincidence? The CCV system was overhauled with replacement of the O-ring around 15k miles and 3 yrs ago.

By removing the oil distribution piece, have I reduced the "pull" of oil vapour from the crankcase, there by, increased the pressure in the crankcase, which is what has resulted in a leak springing at the O-ring?

I don't think I knocked or pulled on the oil dipstick guide tube whilst doing all my other jobs, as it is bolted down and would require considerable force to pull up.

So first thing I'll do is, undo this mod, reinstall the oil distribution piece first and see if the leak from the O-ring decreases. then take it from there.
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Last edited by Oz Striker; 02-18-2016 at 04:20 PM.
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