Mark the chain and the right sprocket with paint so you know where you are. You should be able to lift the chain off the right sprocket and pull it tight against the left sprocket. With it tight, turn the engine CCW until you can get the chain on the right sprocket one tooth back. Then see if you can go forward. Once you get the chain in, be sure to check the assembly marks on the cam thrust washer against TDC on the balancer.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe