Freightliner series 60 2002

Replace your compressor it is defective, it happens.


Blowby is measured when the engine is under a load, no other time,

 

Plus where is it easier for blowby to go? Out past the compressor rings (which have up to 120 PSI pushing back) or out the open blowby pipe?

 

Chances are the “new” compressors pushing oil. They’ll do that, even when new. The rattling noise, was probably just the hole in the intake line, nothing to do with the compressor itself. The hose takes in filtered, turbo charged air. So you were also losing turbo boost/power with the hole in it. But the compressor was still taking in air, either way. The hole in the intake line shouldn’t effect blowby at all. A bad compressor will push a lot of oil into the lines. Bad rings on a compressor can also cause excessive blowby, since oil returns through the front gear case. You can rule this out, by taking the steel braided line off, and see if the blowby quits. The other possible source of blowby, is the Turbo, again from the oil return. You can check it by taking the return line off Turbo, running it a little, while catching the oil in a container, and again checking the engine blowby, to see if it quits. Chances are, the Compressor and Turbo are fine. Might want to check the hose between the Turbo and Charge air cooler, just to make sure oil isn’t leaking from the Turbo, pushing through to the compressor intake hose, while you’re checking everything, just to be sure. Chances are the blowby is from the engine rings. Detroit’s are known for it. But it’s easy enough to rule out the compressor and turbo, worth a shot anyway, might get Lucky, and just need a new compressor, or Turbo.