Sc400 supercharged, blowing smoke out of pcv and elbow.
09-17-18, 01:24 PM
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Sc400 supercharged, blowing smoke out of pcv and elbow.
hey guys, I have a 93 sc400 that is supercharged. I’m a mechanic so I get some smoke coming from here is normal, but this is an extreme amount of smoke. Oil leaks out of cold air intake when I shut it off. I have to add a quart of oil every 50 miles or so. I have seen many threads on this topic but I think this is an extreme situation. The only thing I can think is the rings are shot and sc is dumping boost into crankcase. But then I read these motors are indestructible. Any ideas would be greatly appreciated. Thanks fellas!
09-18-18, 09:13 AM
#2
You are correct that the UZ line is very robust. The thing you arent accounting for is aging/wear-and-tear along with the motor is now doing something that it wasn't originally designed for, run in positive pressure. Have you tried a leakdown test or a compression test to get a baseline of the engine's health? I would suspect if the motor hasn't been opened up two things are occurring; First, seals, gaskets and rings are starting to wear. The second is that now you have wear on the motor, blowby is increasing under boost; something that the motor (even if it were brand new) wasn't setup to do. If you arent into trying a leakdown test, try removing the PCV and install an atmospheric vented catch cant to the valve covers and see how much oil is being collected. This will give you a de-facto way of seeing the health of your rings.
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