1988RedT2

Okay. I'll try to be brief: Currently running 9 psi on a recent Majestic rebuild / upgrade. Before the rebuild, after freeing up the exhaust, replacing the fuel pump, and putting on a cone filter, I was getting a pretty good plume of smoke on redline shifts. I figured it was the turbo, so I had it rebuilt. Right from the very first run with the new turbo, the same thing is happening. Maybe its not the turbo?



It really doens't smoke at any other time. How can I tell for sure it's the turbo? Any other likely sources of this smoke?







Thanks for any help you can offer.

1Revvin7

Whats your oil pressure? Are you using the stock feed line? Are you premixing?

If you want to know for sure. You can take off the turbo and inspect the turbine housing and turbo exhaust manifold for oil. If you see oil in just the turbine housing then its the turbo. If you see oil in the exhaust manifold then its the motor. You can also remove the return line to be sure oil is actually flowing through the turbo. I have heard of rebuilds from Majestic going sour.



Here is what my blown turbo looked like.

1988RedT2

Reads about 60 psi on the stock gauge with a new sending unit. Yes, I'm using the stock feed line. I tested flow before I hooked everything back up, and it flowed quite well, supply and return. No premix--stock OMP.

Even prior to the rebuild, the exhaust manifold and turbo exhaust housing were oil-free. This car sees only occasional use, primarily at the strip.



And oh yeah, the engine has just over 100k on it.

1988RedT2

Nice pic, but the inside of my turbo was dry and brownish-looking--nothing like that one.

j9fd3s

um you can try the rotor oil seal o ring test and start it cold and rev it to 5k or so and see if you get smoke

1988RedT2

I guess I'd better go do that.



Is that a BIG O-ring? Like where the side seals are?



Sorry to sound ignorant, but I've never had one of these engines apart....yet.

j9fd3s

yeah its on the sides of the rotors. its hard to tell the pcv from the engine from the turbo when these things smoke

1988RedT2

What's that? PCV you say? Hmmm. It's not in my Haynes. Gotta go check my FSM....



You mean PCV as in PCV valve right? Positive Crankcase Ventilation?



I see a reference to a "Purge Valve". Is that it?

j9fd3s

yep, make sure its hooked up right.

1988RedT2

Okay. Thanks very much!

Will the smoke at 5k on a cold engine be VERY noticeable if the O-rings are shot?

I have noticed some smoking on cold starts, but not a lot, and it goes away immediately.