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Vnt Blowing oil..... Still!
by
camboscams
on 24 Sep, 2011 13:47
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So I've installed a vnt recently and I'm having issues with it blowing oil past the shaft seals, i assume. I blew an intake tube off last night and didn't have the means to fix it so i limped it home and there was a ton of engine oil covering anything above the turbo outlet. I didn't wind it out or close the vanes via the accelerator linkage i have so it would over-speed or do anything crazy. I've suspected that i was before judging by the amount of oil in the intake tubes when i removed them... Now i know that there is a healthy amount in them normally but there is a lot in mine now. My only worrie is my oil return. Its made of -10an and summit racing fittings but it does have a slight slope to the side, its not quite a straight shoot. I'll post pictures tomorrow hopefully. So i guess my question is (once i get my picture up) is my drain the problem? it enters the pan at the same height as everyone elses. It can't be block pressure i have both the head and the block vent free flowing. Any thoughts? its a 1.6L in a rabbit if it matters
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#1
by
R.O.R-2.0
on 24 Sep, 2011 20:20
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hows your breather setup? if you get any block (blow by) pressure, it will blow oil past the seals..
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#2
by
camboscams
on 25 Sep, 2011 06:27
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The valve cover breather is vented back into the pre turbo intake tube and the block vent is pointed to the ground with no obstructions.
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#3
by
R.O.R-2.0
on 25 Sep, 2011 09:20
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The valve cover breather is vented back into the pre turbo intake tube and the block vent is pointed to the ground with no obstructions.
well, thats not it.. you have better block ventilation than i do..
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#4
by
camboscams
on 25 Sep, 2011 13:11
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Yea I've been chasing this problem for awhile now.... I already had a hole in my pan for the turbo i had before this one and it was toward the trans end of the rear of the pan and the only thing i can figure is is that the slight bend that the drain makes and then goes into the 90* an fitting that threads into the 10- an bung that i welded tight to the pan which is at a slight angle as well (due to the engines normal orientation) . but I'd have to get another pan or grind off the bung and weld the hole shut and move it to directly below the turbo. then the piece of braided line would only be like two inches long and would be a pain to thread on and off
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#5
by
R.O.R-2.0
on 25 Sep, 2011 16:58
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Yea I've been chasing this problem for awhile now.... I already had a hole in my pan for the turbo i had before this one and it was toward the trans end of the rear of the pan and the only thing i can figure is is that the slight bend that the drain makes and then goes into the 90* an fitting that threads into the 10- an bung that i welded tight to the pan which is at a slight angle as well (due to the engines normal orientation) . but I'd have to get another pan or grind off the bung and weld the hole shut and move it to directly below the turbo. then the piece of braided line would only be like two inches long and would be a pain to thread on and off
whats -10an equiv. to? like 1/4" i.d. pipe? 1/2" pipe?
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#6
by
camboscams
on 25 Sep, 2011 17:17
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So in AN world the -XX number denotes the number of 1/16ths that it describes. so in this case -10an is 5/8ths inside diameter
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#7
by
R.O.R-2.0
on 26 Sep, 2011 11:15
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So in AN world the -XX number denotes the number of 1/16ths that it describes. so in this case -10an is 5/8ths inside diameter
oh, well hell, thats BIGGER than what im running, and i have no problems..
are the seals in the turbo FOR SURE the correct ones?
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#8
by
camboscams
on 26 Sep, 2011 13:11
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I hope so its a brand new center section from Gpop Shop!
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#9
by
R.O.R-2.0
on 26 Sep, 2011 13:13
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i would send it back, and have them re-rebuild it.. my turbo is unknown condition/miles and still doesnt blow oil..
if the seals are NOT SEALING, then its not right..
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#10
by
nathan_b
on 26 Sep, 2011 13:55
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i would send it back, and have them re-rebuild it.. my turbo is unknown condition/miles and still doesnt blow oil..
if the seals are NOT SEALING, then its not right..
A customer of mine had a vnt15 rebuild by a "diesel shop." and 5000mi later, there was more than 1/2 inch of play in the turbo shaft. Sold him a nice used vnt (cheaper than rebuild) and it's been fine for 20k or so.
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#11
by
rodpaslow
on 26 Sep, 2011 14:12
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My vnt drain goes to the normal MK2 drain that the pan had. I used the top steel section from the VNT and the bottom steel section from the old T3 with a peice of silicon hose between. I thing the original VNT outlet is only 1/2" so I can't see yours being a problem (size wise). I read through and I don't see if your checking how much oil your loosing? I've had a pipe blow off mine as well and it doesn't take much diesel oil to make a mess. I've added a mann filter to my system and it's keeping the intake clean, but doesn't pull off as much oil as I thought it would. After about 1000mi I maybe had 100ml it pulled out.
With my car it's only pulling from the valve cover like VW intended. I have major problems with the block vent I tried a couple times and that was the big problem for me. It was dumping 100ml plus each 30mi drive or so. I plugged it and added the mann filter to the valve cover vent and not had problems since. However, my vent lines are 1" in diameter running to the mann filter and back into the intake. My $.02
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#12
by
R.O.R-2.0
on 26 Sep, 2011 14:26
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My vnt drain goes to the normal MK2 drain that the pan had. I used the top steel section from the VNT and the bottom steel section from the old T3 with a peice of silicon hose between. I thing the original VNT outlet is only 1/2" so I can't see yours being a problem (size wise). I read through and I don't see if your checking how much oil your loosing? I've had a pipe blow off mine as well and it doesn't take much diesel oil to make a mess. I've added a mann filter to my system and it's keeping the intake clean, but doesn't pull off as much oil as I thought it would. After about 1000mi I maybe had 100ml it pulled out.
With my car it's only pulling from the valve cover like VW intended. I have major problems with the block vent I tried a couple times and that was the big problem for me. It was dumping 100ml plus each 30mi drive or so. I plugged it and added the mann filter to the valve cover vent and not had problems since. However, my vent lines are 1" in diameter running to the mann filter and back into the intake. My $.02
i have basically the same oil drain, but with a mk1 pan, and lower half of T3 line..
same with the breather setup.. ive had nothing but a stock VW breather system on my car since ive turbo'd this engine, but i hooked a road draft tube to the hockey puck instead of feeding my turbo the oil. my engine has done just fine. currently, its got an ABA valve cover, and a regular hockey puck breather oil separator on it, and works fine.. my breather does occasionally have a drip or 2 of oil coming out if im really boosting hard all day..
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#13
by
camboscams
on 17 Oct, 2011 19:02
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#14
by
BillyWillicker
on 18 Oct, 2011 08:02
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Nice photos and try some stronger crankcase evacuation. That's a nice looking drain, shouldn't hold oil in the turbo. The only thing I see wrong is the lift use, Flat pads on the pinch welds of a VW is the best way unless it's wayyy rusted.
