A couple weeks ago my car suddenly stopped running. I discovered the timing chain had slipped quite a bit and I have changed that and took the head off to inspect all the valves ect. Now that I have it all back together it seems there is another major problem in the bottom end. The engine will turn over fine until it hits TDC, then it locks up and takes considerable force to move it beyond this. I now have the timing chain off and the only thing that is still hooked up to the crank is the oil pump. Is there any chance that the oil pump could be at fault? I’m hoping this but doubtful, any ideas on what else could be wrong? HELP! (1980 300SD) - thanks William

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1983 Mercedes 300SD
1987 Mercedes 300SDL
2001 VW Passat 2.8 AWD
2007 OM642 Jeep WK 4x4