I changed the Timing chain on the 300SD, but now when I try to turn the crank the engine by hand, using the crankshaft nut, it just stops. It doesn't feel like the compression is too high because I've been able to turn it by hand before and the feeling is different this time. It feels like there's a jam somewhere.

Did I jump a sprocket? I've been able to join the chain together.

Thanks,
bigmaq

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2009 R350, now the daily driver
1980 300SD, was the daily driver