SChema

I have a 1988 Turbo II.

I'm pretty sure that my Oil Control Rings or O rings have failed, but it never hurts to ask for another opinion. The reason that leads me to this is that I have lost about 1 - 1.5 quarts of 20-50 Castrol in about 2 - 3 hours of idling; while idling, a continuous amount of white smoke is exiting the exhaust. At first I thought that my turbo could have blown a seal; however, white smoke exits the exhaust on initial start-up on a cold motor. I don't think a fairly cool hotside on a turbo would blow white smoke that quickly. I'm getting about 45 psi of oil pressure at 1500 - 2000 RPMs.

I don't think my OMP could be an issue, however, I could be wrong. Could a failed OMP pump out that much oil in the given time of 2 - 3 hours of idling? I cranked the motor for about 15 seconds with the EGI Fuse out; then pulled the leading plugs and found a coat of oil. Does the OMP function while the car is not running? Only reason I ask is because I pulled the EGI Fuse and both the leading plugs and cranked the motor. After about 15 - 20 seconds, I find oil coating the plug holes and a mist of oil on my frame rail.

Doing these checks leads me to believe that the Oil Control Rings have failed; is it a coincidence that the Oil Control Rings in both rotors happened to fail at the same time or is this a frequent problem?

I would like to get some feed back on any other tests I should do prior to me pulling the motor out within the next couple of days.

Any help is much appreciated. Thanks in advance!

eriksseven

iTrader: (6)

Did this problem just "come out of nowhere"? Has the TII been sitting for a long time?

I'm guessing that for (whatever) reason your oil-control ring inserts have failed... I had a similar problem with one of the many RX-7's I've dealt with--where everything was fine, I parked the car for two weeks and on the next start-up I had constant smoke for an hour straight...

I replaced the turbo thinking the seals were bad, and still had the same smoking issues. My plugs were also coated with oil after just a brief run-time.

I tore the engine apart, and after inspecting the actual control-rings, decided they were still fine (sharp with no chips or unusual wear), and just replaced my "squared" looking control ring inserts with some new Viton seals from Atkins. Of course I also replaced all the internal springs and other soft-seals/gaskets while the engine was apart.

Problem solved.

SChema

The motor has a mild street port. Porting was done by myself with the help of Pineapple's template. I made sure I didn't port inwards towards the Control ring's path; how much clearance is there, just incase I happened to take some off while cleaning up the casting?

Most likely I'll be pulling the motor this weekend and taking it apart. What else should I be looking for on the rings other than cracks and chips. How should the rings fit after they have been installed? Once they are pushed into their grooves, do the springs push them back up with little effort? Should they fall out of the groove when the rotor is flipped upside down.

Thanks for the help!