I have a Bitzer 6G compressor with unloaders on 2 heads. My suction pressure is 2.5 Bar but when the compressor is fully loaded the crankcase pressure rises to 6 Bar.
When unloading the right hand bank of cylinders the crankcase pressure comes down to suction pressure.
To me it looks like there is a crack in one of the pistons in that bank, or the piston rings are broken.

Has anyone had issues like this with Bitzer compressors?..