want to quit smoking

C2later · 04-28-2003, 12:57 PM

I had recently purchased a 79 930,(18,500 original miles).Raw engine oil started leaking into the muffler and tail pipe,causing it to smoke real bad.I did the following:
1)replaced the turbo charger (modified rebuilt stock unit) twice.The first one claimed to have been faulty because of the same reason(leaking oil)
2)Installed a new Billet monster scavenger oil pump system.
3)Installed new oem oil return line,scavenger pump to oil tank.
4)Blew out oil inlet of oil tank with compressed air,seemed to be ok.
Once the oil is cleared out after driving (5 to 10 min.) the engine runs and idles perfect,and does not smoke at all!
The engine does have an aftermarket B&B complete exhaust system with a smaller than stock turbo oil drain return pan,(B&B system comes stock with no ventilation tube).
Which type of patch can i go to next?

C2later

Wayne 962 · Wayne 962's Garage

Any chance of figuring out where the oil is coming from? I would think it must be coming from the turbo lube system?

-Wayne

C2later · 04-28-2003, 11:36 PM

Wayne,
I'm almost all positive it's coming from the turbo lube system.My only theory at this point is the turbo drip oil pan is to small and cannot hold the drain capacity after engine shut down.If this was the case,why aren't larger turbo oil drain tanks available? I have not yet heard of other 930 owners with the same system i have,incountering the same problem i have.

Don

Wayne 962 · Wayne 962's Garage

This is indeed not a common problem. I'm at a loss on this one...

-Wayne

TimT · 04-29-2003, 08:59 AM

Sounds like oil is getting past the turbine seals, and finding its way into the exhaust. The usuall cure is a billet scavenge pumpp (which you installed). Larger scavenge tanks are available, Im not sure about if Pelican handles specialized items like this, but Turbo Performance Center, Protomotive, and Powerhaus come to mind.

What exactly is the modified rebuilt stock turbo you installed?

C2later · 04-29-2003, 11:35 AM

To be honest with you, i'm not exactly sure? I know very little about turbo chargers,but my guess they whould install different impellers,vanes and etc., and diffused them differently and maybe increase housing size to manage the increase pressure and flow.I know thier highly sophisticated units with not alot of moving parts.
Still trying to quit....

john walker's workshop · 04-29-2003, 12:14 PM

i had a problem like that with a powerhaus dual inlet turbo once. seems that the turbo was designed for marine racing, so it didn't matter about the sealing. that puppy drooled a puddle into both sides of the turbo overnight, and would blow a smoke screen to make james bond jealous. i sent it in to be rebuilt, and same thing, so i bought a K27/11.

lendaddy · 04-29-2003, 01:50 PM

Read about a guy with this problem. There is an oil line that comes from the top rear of the engine attaches under the oil pressure switch. The Boss the hollow bolt for this oil line is in is supposed to have a 9mm ball inside it to serve as a check valve and prevent oil draing back to the turbo. I will see if I can find a diagram for you. It could either be missing or stuck. Or I could be on crack and this is not your problem at all.

lendaddy · 04-29-2003, 01:55 PM

This pic shows the oil line, hollow bolt, etc.. I am talking about. The ball drops in where I have the arrow.

C2later · 04-29-2003, 08:53 PM

Hey man,Ill check it out asap! If this makes me quit smoking, i'd be more than happy to score your next fix. Super thanks for the photo,without it ,i wouldn't know what to look for.
Really want to quit........

C2later

john walker's workshop · 04-30-2003, 08:09 AM

the ball actually helps to keep oil from draining out of the oil passages, so the engine doesn't start dry. a normally aspirated engine would be sealed there. sealed passages, without a hole at the end, tend to hold their fluids. the turbo oil line eventually dumps into the engine oil tank. relate it to keeping a finger on the end of a full drinking straw.

C2later · 04-30-2003, 10:40 AM

What kind of symtom whould a turbo engine have if that 9mm ball was stuck or missing? I have good oil pressure. It dosent have that "no oil on bearing sound "(knocking) on initial start-up after sitting
overnight.Whould you assume that 9mm check ball is ok?
By the way,did you get stuck with that oil smoking ,oil leaking marine
turbo? Im afraid i might have that same unit! How did you go abuot deciding on a K27/11 turbo? what modifications were needed?
Heavy smoking is very bad ..........

john walker's workshop · 01:53 PM

you will still have good oil pressure without the ball. the passages will just have to fill up for about one or two seconds before you get it. the check ball has nothing to do with the oil leaking into the turbo, as it doesn't seal that side of the system.
the turbo was blue, had a 6 bolt, round exhaust flange which came with it, and had to be welded onto the muffler inlet in place of the square one. came on late, pulled like hell, and smoked a ton after sitting for a few days. the K27/11 seems to be the preferred swap because they spool up faster. big compressor, small hot house. the compressor is bigger, so minor sheetmetal trimming is required on the tin across the back of the engine. the oil sump should be changed to the smaller, aftermarket unit, due to clearance problems.

C2later · 05-01-2003, 11:10 AM

WOW!...blue turbo,round exhaust flange with six bolt holes? The welding alone whould have kept me from installing that thing.Mine was painted gold and aluminum with your standard four bolt flange.
I decided to inspect the oil pressure adapter housing in search of the 9 mm ball.Guess what? Gone.....It was missing!! Not sure if it's giong to stop my smoking habit,but we all know it does belong in that external oil circuit.Had to special order....dealership item...Ill keep you guys posted on the results?
Just maybe a chance of quiting......

C2later

lendaddy · 05-01-2003, 11:38 AM

C2later,

I found it. This is the thread I was referring to. Odds are JW is right, but this guy claims lack of the ball causes overoiling to the turbo and oil going past the seals. Just passin on info. Click the link below.

http://www.turbo911.com/forum/forum/display_topic_threads.asp?ForumID=6&TopicID=308&PagePosition=1

Best of luck, and hope this helps.

C2later · 05-02-2003, 12:45 AM

Gee's,did he have to rebuild the turbo unit because of over-oiling? or being overspun? So it's possible,even after i install the 9mm ball,my smoking problem still may be there,and whould not know if we cured the problem? Does that sound right?
Did feel good, and now im not so sure?

C2later

lendaddy · 05-02-2003, 05:42 AM

I think he had to rebuild the turbo because of the thrust bearing being worn. I could be wrong though.

john walker's workshop · 05-02-2003, 08:02 AM

if you look at the above picture, you will notice a cutout on the bottom of the hollow bolt/fitting. under oil pressure, the ball is forced against the cutout, not into it, and oil passes around the ball. how is this going to limit oil flow?

lendaddy · 05-02-2003, 08:09 AM

Good question. I am not at all challenging your expertise John, I just happened to remember reading this and thought I would pass it on.

john walker's workshop · 05-02-2003, 08:38 AM

i always just took this for granted, but i could be wrong. just looking at the mechanics of the setup, i don't see how it could limit oil flow. slightly, i guess, being that the ball is in there, but not a lot.