After getting the engine to a stand, it was easy to start the investigation. I cleaned it a bit and removed the oil pan. I was greeted with this sight.
The pan and oil pump pickup were covered in brown sludge and pieces of hard plastic. I tried finding the source of the plastic and the best explanation was perhaps the valve seals. I checked them and the rubber seals were there but I'm not sure if they should contain plastic too.
It was not looking good but perhaps at least the bearings would be better. They weren't. I only opened two main caps and had seen enough. Here's bearing number two.
It's also possible to see the camshaft in the background. Many of its lobes are unhealthy orange in color. Just to be sure, I also checked the bearing number 4.
Yeaaah, the bearings are worse than in my own original engine. Final nail to the coffin were the spark plugs. Two of them seemed pretty oily so either the valve seals or piston rings had been leaking.
There's no sense in putting this engine to my car so I guess I'll sell its good pieces to someone and use the money to fix my original engine. It will probably take most of the winter so I'm not sure if I can drive the car next summer after all...
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