North American Turbocoupe Organization



oil seperator loose fit question
mark murphy Offline
Member
#1
I have been trying to fix an oil leak that comes and goes and I believe I have too much crankcase pressure causing it. When pulling off the pvc hose to the oil seperator I noticed it was loose meaning you can rotate the seperator an inch or so each way. It's not pressed into the block. Could this cause the pvc valve not to work properly? If so, in order to get the seperator seated it looks like the lower intake has to come off. Is this right?
88 TC silver, 11/05 complete engine rebuild including head work, stainless valves, upper/lower intakes machined by Pete D. Added T-3 60/63 using Bob Lee 3 Gen. header, 3"downpipe no cat, 2-1/2" duals, adj FP Reg. Walbro 255 FP, cold air intake,Gillis boost valve, bypass valve, 3 row radiator, 17 x 9 Cobra R Wheels
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Pete D Offline
Administrator
#2
It's not unusual to see the seperator loose in theblock It's just a poor interference fit. That should not affect the way the PCV works. If it was loose enough I could see possible oil leakage around it. Yes you would hae to pull the lower to get it properly seated
Pete Dunham


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Turboeric Offline
Junior Member
#3
It can affect the system, because you can draw unmetered air.
1988 TC, T3/4, 3", 2 1/2 w/aero chambers, RR+, E6, intake, head porting, 55lbs, K&N, stage III, "tuned" eec, 80mm MAF, frt mnt, big valves.
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trashline Offline
Posting Freak
#4
Quote:Originally posted by Turboeric:
It can affect the system, because you can draw unmetered air.
To an extent. My oil separator line runs right into a catch can breather. I plugged the vacuum port for the PCV on the intake. I myself was getting serious blowby thru the dipstick and oil in the intake track. The short block has 200,000 miles on it so it isnt perfect. With the exception of a blown HG a couple weeks ago from poor install i dont have any problems with the car.

Anyway, the oil separator has a nut that can be tightend once the filter is removed. I didnt have to remove the lower intake just jack the car up. this would be a good time to pull it off and install a new gasket which is like the oil filter gasket. then install and tighten. If your worried about crankcase pressure or vacuum leaking from the rubber line that can get soft over time replacve the line or stick a couple hose clamps on it. Same with around the PCV if it fits too loose stick a hose clamp on it.

Your blow by could be caused by a bad pcv allowing pressurized air back into the crank case pushing it out the VC and dipstick tube.

But fix the separator first b/c you might not be getting blow by. It could just be an oil leak from the cooler.
Brian

www.BCPCustom.com

06 Cobalt SS
66 mustang 289 C4 handfully modded

Stingers IC install and tbird photos
http://community.webshots.com/user/trashline
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Pete D Offline
Administrator
#5
Quote: the oil separator has a nut that can be tightend once the filter is removed.
Don't you mean the oil cooler? It has nothing to do with blowby

Quote:It can affect the system, because you can draw unmetered air.
How is it unmetered air? Air in the crankcase is either blowby, past the rings, which came through the VAM (metered) Or it's air forced up the valve guides and down the oil return holes (metered again) or it's air drawn in through the breather when the engine is in vacuum, again metered air, on a stock system. Boost is in theory, blocked from entering through the pcv system, but that is still metered air.
Pete Dunham


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trashline Offline
Posting Freak
#6
Quote:Originally posted by Pete D:
Quote: the oil separator has a nut that can be tightend once the filter is removed.
Don't you mean the oil cooler? It has nothing to do with blowby

Quote:It can affect the system, because you can draw unmetered air.
How is it unmetered air? Air in the crankcase is either blowby, past the rings, which came through the VAM (metered) Or it's air forced up the valve guides and down the oil return holes (metered again) or it's air drawn in through the breather when the engine is in vacuum, again metered air, on a stock system. Boost is in theory, blocked from entering through the pcv system, but that is still metered air.
Opps yes Pete your right getting tired my fault.

Disregard the cooler info vs. the separator info lol.
Brian

www.BCPCustom.com

06 Cobalt SS
66 mustang 289 C4 handfully modded

Stingers IC install and tbird photos
http://community.webshots.com/user/trashline
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