The smoke coming out of the oil catchtank tells that something is wrong with the engine. There is also some oil spit around the catchtank filter. Two possibilities: damaged piston rings or a faulty valve. One method to find out more precisely what goes wrong is to measure compression. An adaptor is fitted to the plug hole and the throttle blocked open. Unplugging the ECU prevents the pumps to run, ignition and injection don't operate. The engine must be warm, 10min. @ idle is enough.
One cylinder is measured at a time while the others keep their spark plug to seal the engine at the top. With the gauge connected to the adaptor, the engine is cranked 5 to 10 seconds, the time the needle moves up until it doesn't rise anymore.
The results are as follows: cyl1 9.9bar; cyl2 10.0bar; cyl3 6.8bar; cyl4 10.1bar.
Cylinder three clearly does not have enough compression.
Second step is to fill some oil into cylinder three and repeat the test. If compression is higher, chances are that the piston rings are faulty. If not, it may be a damaged valve. Result: 7.5bar
Enough for tonight, I will further investigate and decide what to do the coming days.
Cheers.
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