The same thing happened to me when I pulled the head on my daughter's 240D and installed a new chain. I "bunched" the chain and was able to move it on the cam sprocket with the tensioner removed. I wound up in the end learning how to time the IP.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"