My car overheated and i had a blown headgasket, i took it to a garage he changed everything in the engine and the head gasket . The engine is still knocking with low oil pressure .i did an engine pressure test all is good Any ideas why the oil is not geeting up

https://youtu.be/FdJpbYb2Rt4

 

If you have the timing cover gasket leak, you will have low oil pressure, which in turn can lead to a spun bearing causing the knock. Search timing cover gasket leak. Its internal so just because you dont see a oil leak, doesnt mean you dont have the issue....

 

This issue usually throws a low oil pressure code and puts the engine in limp mode.