Too Much Oil

[cromf]

Can someone help me out here? I am ready to put my car back to NA before it ever hits the road.
After installing a vj20 on my 1.8l egt I was experincing lots of smoke through the tail pipe and then noticed oil leaking from under side of turbo as well as around the downpipe exhaust connection. I realized something was wrong with the turbo (or so I thought) so even though I was sooooo close I removed it and sent it off for a rebuild.
Fast forward a week or so. Vj20 back and looking really pretty with fresh rebuild. No shaft play, new paint, the works. Rebuilder had found some cranky bearings and bad seals.
So I put the thing back on a few days ago and have the same problem. This time it can't be the Turbo right? I figure it is getting too much oil. So my buddy and I get some smaller fittings for oil line, and a smaller oil feed line.
Yesterday I was back at it. Everything looks good. Until I start.
Now I have smoke, leak at turbo seal location, oil at downpipe connection AND a leak where the new fitting goes into the block. I am going to pull the rebuilt turbo off and test with another turbo we have sitting here. It does not have the fresh rebuild or the hot side jet hot coating I had done.
If the car does the same thing, what could be the problem? Anyone? Do I need to change my stock oil pump for something different? Any help appreciated. If I can't figure it out I may have a bunch of parts for sale.

[jay]

Journal bearing turbos usually don't need an oil feed restrictor, and no you don't wanna downsize your oil pump. Turbo rebuild is a picky process, maybe you got lucky and yours didn't get done right? Call the shop and find out what they think about restrictor for that turbo, in case it does need one and your solution didn't do enough...

[bomdoutscort]

Its not the car thats the problem. The restrictor is in their for that reason. Its something in the turbo thats wrong. You shouldn't leak at the oil return unless its not sealed properly.

[cromf]

420

So it seems maybe the rebuild of Turbo was bogus? Yesterday I put on a smaller diameter oil inlet line, started and had the same problem. I guess I will yank it and send it back to them.

[Mazda_Powered]

what do you have for an oil return line? maybe its getting clogged?

[cromf]

3/4 inch braided line with anti kink wire mesh. I unhooked the line and drained into drain pan as the car was running. Definatley not kinked. I can unhook the drain line with a full pan of oil and nothing comes out. I think the drain is good.
Turbo city says it might be a crankcase ventilation problem. Does that make sense to you?

[jay]

If you have a CC vent problem that's so bad the turbo is bleeding, then you have HUGE other problems. I can't imagine that you wouldn't have noticed effects such as your valvecover breather flooding your engine bay among other things...

[Lex]

Oil is fed into the turbo from the block/oil pump supply. It passes through the bearings and loses most pressure and gravity makes it works it way to the oil pan.

If your path is in any way blocked from the top of the turbo to the bottom it will come out through the seals.

If you have excessive crankcase pressure due to blowby, it will also prevent it from draining back in the pan. If you had that much pressure your oil dipstick would pop out and you could feel the pressure by putting your finger over the dipstick opening.

So if the oil is freely moving out of the turbo, and the feed line is completely stock, it can only be the seals that are left.

[cromf]

Thanks all, sounds to me that if I had the crankcase pressure problem asdescribed by the turbo guys, i would have already known about it before hand. This is a stock 1.8 that ran fine before i started this application. I did swap to the gtx cams and as of right now one cc vent is capped. I have had no issues with dipstick nor did i notice any other issues that may have involved cc pressure. I am going to remove and return turbo for inspection. Meanwhile i have a vj20 of a friend i can slap on for testing. thanks for all the comments. This forum is a little tricky to figure out at first but great when you start getting tips.

[bomdoutscort]

Where are you getting your oil feed from also? Pics of the setup would be nice.

[cromf]

Photos of oil in from block to Turbo and sloppy shot of the oil drain line out to pan. I know the drain line out is not plugged. We unhooked and drained into bucket while car was started. lots of oil. Drain hole higher than oil in pan.

[bomdoutscort]

I dont know but you might be the only one here running an AN fitting on the feed to a vj20. That might be feeding too much oil to the turbo. The stock turbo has the restrictor built in and if you took that out it might have caused you to feed the turbo too much oil.

[jay]

Where exactly does the drain line go?

[cromf]

BOScort-we replaced the stock oil restrictor inlet due to the one i had being a little marred up. I spent about 50 bucks ordering till I got one with the right threads and exact size restrictor hole. I will revisit that and make sure.
Jay, the drain line goes to the pan closer to the crank end of pan. I can take the drain end off drain end and no oil spills out so i kow its higher than oil level at rest. Also we tested when running and it was working all too well.

[jay]

Sounds like you got some bad seals then.